xefitra - dithered gray fonts unreadable

[Werner Heinsohn]

Some parts of this message have been removed. Learn more about Nabble's security policy.

Hello,

I'm using GhostScript to print documents as a tiff file. The output only has to be a monochrom image, therefore the used device is "tiffg4". But if GS encounters documents with gray fonts it dithers it to only a few dots, so the text is nearly impossible to read. This issue could be due to a resolution of just 200dpi, but this should be kept that way, if possible.

If there an option to automatically convert all gray texts to black texts?

I'm using the following command:
gswin32c.exe -dSAFER -dNOPAUSE -dBATCH -sDEVICE=tiffg4 -r200


I really would appreciate it, if someone could help me on this issue.

Thanks and kind regards
Werner Heinsohn

_______________________________________________
gs-devel mailing list
gs-devel@...
http://www.ghostscript.com/mailman/listinfo/gs-devel

[Leonardo-21]

Dear Werner Heinsohn,

We will need your file to reproduce the problem
with out computers. Please enter a bug report into
bugs.Ghostscript.com and attach your test file to there.
You may then mark it "private" to disable access for
3d parties. Thank you.

Leo.

----- Original Message -----
From: "Werner Heinsohn" <werner.heinsohn@...>
To: <gs-devel@...>
Sent: Thursday, September 11, 2008 7:26 PM
Subject: [gs-devel] xefitra - dithered gray fonts unreadable

> Hello,
>
> I'm using GhostScript to print documents as a tiff file. The output only
> has to be a monochrom image, therefore the used device is "tiffg4". But if
> GS encounters documents with gray fonts it dithers it to only a few dots,
> so the text is nearly impossible to read. This issue could be due to a
> resolution of just 200dpi, but this should be kept that way, if possible.
>
> If there an option to automatically convert all gray texts to black texts?
>
> I'm using the following command:
> gswin32c.exe -dSAFER -dNOPAUSE -dBATCH -sDEVICE=tiffg4 -r200
>
>
> I really would appreciate it, if someone could help me on this issue.
>
> Thanks and kind regards
> Werner Heinsohn
>
>
>
>

--------------------------------------------------------------------------------


> _______________________________________________
> gs-devel mailing list
> gs-devel@...
> http://www.ghostscript.com/mailman/listinfo/gs-devel
>

_______________________________________________
gs-devel mailing list
gs-devel@...
http://www.ghostscript.com/mailman/listinfo/gs-devel

[Marcos H. Woehrmann]

Werner,

You can add a statement to the command line to convert all grays that
are darker than a specified value to black and all others to white by
setting a transfer function.

E.g.

gs-sDEVICE=tiffg4 -sOutputFile=test.tif -c "<< /Install { { 0.85 gt {
1 } { 0 } ifelse } settransfer } >> setpagedevice" -f test.ps

You can change the 0.85 value to vary the point where gray turns to
black or white.

marcos

2008/9/11 Werner Heinsohn <werner.heinsohn@...>:

> Hello,
>
> I'm using GhostScript to print documents as a tiff file. The output only has
> to be a monochrom image, therefore the used device is "tiffg4". But if GS
> encounters documents with gray fonts it dithers it to only a few dots, so
> the text is nearly impossible to read. This issue could be due to a
> resolution of just 200dpi, but this should be kept that way, if possible.
>
> If there an option to automatically convert all gray texts to black texts?
>
> I'm using the following command:
> gswin32c.exe -dSAFER -dNOPAUSE -dBATCH -sDEVICE=tiffg4 -r200
>
>
> I really would appreciate it, if someone could help me on this issue.
>
> Thanks and kind regards
> Werner Heinsohn
>
>
> _______________________________________________
> gs-devel mailing list
> gs-devel@...
> http://www.ghostscript.com/mailman/listinfo/gs-devel
>
>

--
Marcos H. Woehrmann
marcos.woehrmann@...
_______________________________________________
gs-devel mailing list
gs-devel@...
http://www.ghostscript.com/mailman/listinfo/gs-devel

[Werner Heinsohn]

Some parts of this message have been removed. Learn more about Nabble's security policy.

Oh! I didn't send it to the list, sorry for that...

Thanks Marcos,

but if I apply your suggestion, the following error occurs:

The used GS call (The _PRINT_FILE is the generated temporary file from the printer by Redmon):
gswin32c.exe -dSAFER -dNOPAUSE -dBATCH -sDEVICE=tiffg4 -r200 -c "<< /Install { { 0.85 gt {1 } { 0 } ifelse } settransfer } >> setpagedevice" -sOutputFile=%P2MFILE% %_PRINT_FILE% >> %LOGFILE%

The error message:
Error: /undefined in II*
Operand stack:
Execution stack:
   %interp_exit   .runexec2   --nostringval--   --nostringval--   --nostringval--   2   %stopped_push   --nostringval--   --nostringval--   --nostringval--   false   1   %stopped_push   1905   1   3   %oparray_pop   1904   1   3   %oparray_pop   1888   1   3   %oparray_pop   1771   1   3   %oparray_pop   --nostringval--   %errorexec_pop   .runexec2   --nostringval--   --nostringval--   --nostringval--   2   %stopped_push   --nostringval--
Dictionary stack:
   --dict:1152/1684(ro)(G)--   --dict:0/20(G)--   --dict:70/200(L)--
Current allocation mode is local
Current file position is 4


While searching the web I found a hint that the redmon input file seems not to have the expected file format. Do I have to manually alter the file before the GS processing occurs? Without your suggested parameters the error message does not occur.

kind regards,
Werner

----- Original Message ----
From: Marcos H. Woehrmann <marcos.woehrmann@...>
To: Werner Heinsohn <werner.heinsohn@...>
Cc: gs-devel@...
Sent: Monday, September 15, 2008 3:57:03 AM
Subject: Re: [gs-devel] xefitra - dithered gray fonts unreadable

Werner,

You can add a statement to the command line to convert all grays that
are darker than a specified value to black and all others to white by
setting a transfer function.

E.g.

gs-sDEVICE=tiffg4 -sOutputFile=test.tif -c "<< /Install { { 0.85 gt {
1 } { 0 } ifelse } settransfer } >> setpagedevice" -f test.ps

You can change the 0.85 value to vary the point where gray turns to
black or white.

marcos

2008/9/11 Werner Heinsohn <werner.heinsohn@...>:

> Hello,
>
> I'm using GhostScript to print documents as a tiff file. The output only has
> to be a monochrom image, therefore the used device is "tiffg4". But if GS
> encounters documents with gray fonts it dithers it to only a few dots, so
> the text is nearly impossible to read. This issue could be due to a
> resolution of just 200dpi, but this should be kept that way, if possible.
>
> If there an option to automatically convert all gray texts to black texts?
>
> I'm using the following command:
> gswin32c.exe -dSAFER -dNOPAUSE -dBATCH -sDEVICE=tiffg4 -r200
>
>
> I really would appreciate it, if someone could help me on this issue.
>
> Thanks and kind regards
> Werner Heinsohn
>
>
> _______________________________________________
> gs-devel mailing list
> gs-devel@...
> http://www.ghostscript.com/mailman/listinfo/gs-devel
>
>

--
Marcos H. Woehrmann
marcos.woehrmann@...

_______________________________________________
gs-devel mailing list
gs-devel@...
http://www.ghostscript.com/mailman/listinfo/gs-devel

[Ray Johnston]

Some parts of this message have been removed. Learn more about Nabble's security policy.

Hello Werner,

The 'II' header looks like that of a TIFF file. Please look at the
input file and make sure it is PostScript. Ghostscript does not
process TIFF files directly (it writes them, doesn't read them).

Regards,
Ray

---

Werner Heinsohn wrote:

Oh! I didn't send it to the list, sorry for that...

Thanks Marcos,

but if I apply your suggestion, the following error occurs:

The used GS call (The _PRINT_FILE is the generated temporary file from the printer by Redmon):
gswin32c.exe -dSAFER -dNOPAUSE -dBATCH -sDEVICE=tiffg4 -r200 -c "<< /Install { { 0.85 gt {1 } { 0 } ifelse } settransfer } >> setpagedevice" -sOutputFile=%P2MFILE% %_PRINT_FILE% >> %LOGFILE%

The error message:
Error: /undefined in II*
Operand stack:
Execution stack:
   %interp_exit   .runexec2   --nostringval--   --nostringval--   --nostringval--   2   %stopped_push   --nostringval--   --nostringval--   --nostringval--   false   1   %stopped_push   1905   1   3   %oparray_pop   1904   1   3   %oparray_pop   1888   1   3   %oparray_pop   1771   1   3   %oparray_pop   --nostringval--   %errorexec_pop   .runexec2   --nostringval--   --nostringval--   --nostringval--   2   %stopped_push   --nostringval--
Dictionary stack:
   --dict:1152/1684(ro)(G)--   --dict:0/20(G)--   --dict:70/200(L)--
Current allocation mode is local
Current file position is 4


While searching the web I found a hint that the redmon input file seems not to have the expected file format. Do I have to manually alter the file before the GS processing occurs? Without your suggested parameters the error message does not occur.

kind regards,
Werner

----- Original Message ----
From: Marcos H. Woehrmann marcos.woehrmann@...
To: Werner Heinsohn werner.heinsohn@...
Cc: gs-devel@...
Sent: Monday, September 15, 2008 3:57:03 AM
Subject: Re: [gs-devel] xefitra - dithered gray fonts unreadable

Werner,

You can add a statement to the command line to convert all grays that
are darker than a specified value to black and all others to white by
setting a transfer function.

E.g.

gs-sDEVICE=tiffg4 -sOutputFile=test.tif -c "<< /Install { { 0.85 gt {
1 } { 0 } ifelse } settransfer } >> setpagedevice" -f test.ps

You can change the 0.85 value to vary the point where gray turns to
black or white.

marcos

2008/9/11 Werner Heinsohn <werner.heinsohn@...>:
> Hello,
>
> I'm using GhostScript to print documents as a tiff file. The output only has
> to be a monochrom image, therefore the used device is "tiffg4". But if GS
> encounters documents with gray fonts it dithers it to only a few dots, so
> the text is nearly impossible to read. This issue could be due to a
> resolution of just 200dpi, but this should be kept that way, if possible.
>
> If there an option to automatically convert all gray texts to black texts?
>
> I'm using the following command:
> gswin32c.exe -dSAFER -dNOPAUSE -dBATCH -sDEVICE=tiffg4 -r200
>
>
> I really would appreciate it, if someone could help me on this issue.
>
> Thanks and kind regards
> Werner Heinsohn
>
>
> _______________________________________________
> gs-devel mailing list
> gs-devel@...
> http://www.ghostscript.com/mailman/listinfo/gs-devel
>
>



--
Marcos H. Woehrmann
marcos.woehrmann@...

_______________________________________________
gs-devel mailing list
gs-devel@...
http://www.ghostscript.com/mailman/listinfo/gs-devel
  

_______________________________________________
gs-devel mailing list
gs-devel@...
http://www.ghostscript.com/mailman/listinfo/gs-devel

[Marcos H. Woehrmann]

Werner,

I think the problem is the command line order and the missing -f
before the input filename, try putting the commands in the following
order:

  gs <options> -c "<< /Install ... >> setpagedevice" -f input_filename

marcos

2008/9/15 Werner Heinsohn <werner.heinsohn@...>:

> Oh! I didn't send it to the list, sorry for that...
>
> Thanks Marcos,
>
> but if I apply your suggestion, the following error occurs:
>
> The used GS call (The _PRINT_FILE is the generated temporary file from the
> printer by Redmon):
> gswin32c.exe -dSAFER -dNOPAUSE -dBATCH -sDEVICE=tiffg4 -r200 -c "<< /Install
> { { 0.85 gt {1 } { 0 } ifelse } settransfer } >> setpagedevice"
> -sOutputFile=%P2MFILE% %_PRINT_FILE% >> %LOGFILE%
>
> The error message:
> Error: /undefined in II*
> Operand stack:
> Execution stack:
>    %interp_exit   .runexec2   --nostringval--   --nostringval--
> --nostringval--   2   %stopped_push   --nostringval--   --nostringval--
> --nostringval--   false   1   %stopped_push   1905   1   3   %oparray_pop
> 1904   1   3   %oparray_pop   1888   1   3   %oparray_pop   1771   1   3
> %oparray_pop   --nostringval--   %errorexec_pop   .runexec2
> --nostringval--   --nostringval--   --nostringval--   2   %stopped_push
> --nostringval--
> Dictionary stack:
>    --dict:1152/1684(ro)(G)--   --dict:0/20(G)--   --dict:70/200(L)--
> Current allocation mode is local
> Current file position is 4
>
>
> While searching the web I found a hint that the redmon input file seems not
> to have the expected file format. Do I have to manually alter the file
> before the GS processing occurs? Without your suggested parameters the error
> message does not occur.
>
> kind regards,
> Werner
>
>
>
> ----- Original Message ----
> From: Marcos H. Woehrmann <marcos.woehrmann@...>
> To: Werner Heinsohn <werner.heinsohn@...>
> Cc: gs-devel@...
> Sent: Monday, September 15, 2008 3:57:03 AM
> Subject: Re: [gs-devel] xefitra - dithered gray fonts unreadable
>
> Werner,
>
> You can add a statement to the command line to convert all grays that
> are darker than a specified value to black and all others to white by
> setting a transfer function.
>
> E.g.
>
> gs-sDEVICE=tiffg4 -sOutputFile=test.tif -c "<< /Install { { 0.85 gt {
> 1 } { 0 } ifelse } settransfer } >> setpagedevice" -f test.ps
>
> You can change the 0.85 value to vary the point where gray turns to
> black or white.
>
> marcos
>
> 2008/9/11 Werner Heinsohn <werner.heinsohn@...>:
>> Hello,
>>
>> I'm using GhostScript to print documents as a tiff file. The output only
>> has
>> to be a monochrom image, therefore the used device is "tiffg4". But if GS
>> encounters documents with gray fonts it dithers it to only a few dots, so
>> the text is nearly impossible to read. This issue could be due to a
>> resolution of just 200dpi, but this should be kept that way, if possible.
>>
>> If there an option to automatically convert all gray texts to black texts?
>>
>> I'm using the following command:
>> gswin32c.exe -dSAFER -dNOPAUSE -dBATCH -sDEVICE=tiffg4 -r200
>>
>>
>> I really would appreciate it, if someone could help me on this issue.
>>
>> Thanks and kind regards
>> Werner Heinsohn
>>
>>
>> _______________________________________________
>> gs-devel mailing list
>> gs-devel@...
>> http://www.ghostscript.com/mailman/listinfo/gs-devel
>>
>>
>
>
>
> --
> Marcos H. Woehrmann
> marcos.woehrmann@...
>
>
>
> _______________________________________________
> gs-devel mailing list
> gs-devel@...
> http://www.ghostscript.com/mailman/listinfo/gs-devel
>
>

--
Marcos H. Woehrmann
marcos.woehrmann@...
_______________________________________________
gs-devel mailing list
gs-devel@...
http://www.ghostscript.com/mailman/listinfo/gs-devel

[Werner Heinsohn]

Some parts of this message have been removed. Learn more about Nabble's security policy.

Hello,

in the right order, the command workes great. But I noticed that images which were dithered before, now turn completly black. Is there a way to treat font text differently that images? The perfect way would be to process images "in the old way" and text with the new settransfer command. Is that possible?

Thanks and kind regards
Werner

----- Original Message ----
From: Marcos H. Woehrmann <marcos.woehrmann@...>
To: Werner Heinsohn <werner.heinsohn@...>
Cc: gs-devel@...
Sent: Monday, September 15, 2008 4:35:40 PM
Subject: Re: [gs-devel] xefitra - dithered gray fonts unreadable

Werner,

I think the problem is the command line order and the missing -f
before the input filename, try putting the commands in the following
order:

  gs <options> -c "<< /Install ... >> setpagedevice" -f input_filename

marcos

2008/9/15 Werner Heinsohn <werner.heinsohn@...>:

> Oh! I didn't send it to the list, sorry for that...
>
> Thanks Marcos,
>
> but if I apply your suggestion, the following error occurs:
>
> The used GS call (The _PRINT_FILE is the generated temporary file from the
> printer by Redmon):
> gswin32c.exe -dSAFER -dNOPAUSE -dBATCH -sDEVICE=tiffg4 -r200 -c "<< /Install
> { { 0.85 gt {1 } { 0 } ifelse } settransfer } >> setpagedevice"
> -sOutputFile=%P2MFILE% %_PRINT_FILE% >> %LOGFILE%
>
> The error message:
> Error: /undefined in II*
> Operand stack:
> Execution stack:
>    %interp_exit  .runexec2  --nostringval--  --nostringval--
> --nostringval--  2  %stopped_push  --nostringval--  --nostringval--
> --nostringval--  false  1  %stopped_push  1905  1  3  %oparray_pop
> 1904  1  3  %oparray_pop  1888  1  3  %oparray_pop  1771  1  3
> %oparray_pop  --nostringval--  %errorexec_pop  .runexec2
> --nostringval--  --nostringval--  --nostringval--  2  %stopped_push
> --nostringval--
> Dictionary stack:
>    --dict:1152/1684(ro)(G)--  --dict:0/20(G)--  --dict:70/200(L)--
> Current allocation mode is local
> Current file position is 4
>
>
> While searching the web I found a hint that the redmon input file seems not
> to have the expected file format. Do I have to manually alter the file
> before the GS processing occurs? Without your suggested parameters the error
> message does not occur.
>
> kind regards,
> Werner
>
>
>
> ----- Original Message ----
> From: Marcos H. Woehrmann <marcos.woehrmann@...>
> To: Werner Heinsohn <werner.heinsohn@...>
> Cc: gs-devel@...
> Sent: Monday, September 15, 2008 3:57:03 AM
> Subject: Re: [gs-devel] xefitra - dithered gray fonts unreadable
>
> Werner,
>
> You can add a statement to the command line to convert all grays that
> are darker than a specified value to black and all others to white by
> setting a transfer function.
>
> E.g.
>
> gs-sDEVICE=tiffg4 -sOutputFile=test.tif -c "<< /Install { { 0.85 gt {
> 1 } { 0 } ifelse } settransfer } >> setpagedevice" -f test.ps
>
> You can change the 0.85 value to vary the point where gray turns to
> black or white.
>
> marcos
>
> 2008/9/11 Werner Heinsohn <werner.heinsohn@...>:
>> Hello,
>>
>> I'm using GhostScript to print documents as a tiff file. The output only
>> has
>> to be a monochrom image, therefore the used device is "tiffg4". But if GS
>> encounters documents with gray fonts it dithers it to only a few dots, so
>> the text is nearly impossible to read. This issue could be due to a
>> resolution of just 200dpi, but this should be kept that way, if possible.
>>
>> If there an option to automatically convert all gray texts to black texts?
>>
>> I'm using the following command:
>> gswin32c.exe -dSAFER -dNOPAUSE -dBATCH -sDEVICE=tiffg4 -r200
>>
>>
>> I really would appreciate it, if someone could help me on this issue.
>>
>> Thanks and kind regards
>> Werner Heinsohn
>>
>>
>> _______________________________________________
>> gs-devel mailing list
>> gs-devel@...
>> http://www.ghostscript.com/mailman/listinfo/gs-devel
>>
>>
>
>
>
> --
> Marcos H. Woehrmann
> marcos.woehrmann@...
>
>
>
> _______________________________________________
> gs-devel mailing list
> gs-devel@...
> http://www.ghostscript.com/mailman/listinfo/gs-devel
>
>

--
Marcos H. Woehrmann
marcos.woehrmann@...

_______________________________________________
gs-devel mailing list
gs-devel@...
http://www.ghostscript.com/mailman/listinfo/gs-devel

[Werner Heinsohn]

Some parts of this message have been removed. Learn more about Nabble's security policy.

Can someone help me with this issue?
The text fonts should be processed with the command 'gs <options> -c "<< /Install ... >> setpagedevice" -f input_filename'
...while the images get dithered in the normal "sDEVICE=tiffg4" process.

Is this possible? I also looked through the EPS file to maybe find a way to accomplish the goal, but the syntax seems to be too complex.

best regards,
Werner

----- Original Message ----
From: Werner Heinsohn <werner.heinsohn@...>
To: Marcos H. Woehrmann <marcos.woehrmann@...>
Cc: gs-devel@...
Sent: Tuesday, September 16, 2008 9:28:14 AM
Subject: Re: [gs-devel] xefitra - dithered gray fonts unreadable

Hello,

in the right order, the command workes great. But I noticed that images which were dithered before, now turn completly black. Is there a way to treat font text differently that images? The perfect way would be to process images "in the old way" and text with the new settransfer command. Is that possible?

Thanks and kind regards
Werner

----- Original Message ----
From: Marcos H. Woehrmann <marcos.woehrmann@...>
To: Werner Heinsohn <werner.heinsohn@...>
Cc: gs-devel@...
Sent: Monday, September 15, 2008 4:35:40 PM
Subject: Re: [gs-devel] xefitra - dithered gray fonts unreadable

Werner,

I think the problem is the command line order and the missing -f
before the input filename, try putting the commands in the following
order:

  gs <options> -c "<< /Install ... >> setpagedevice" -f input_filename

marcos

2008/9/15 Werner Heinsohn <werner.heinsohn@...>:

> Oh! I didn't send it to the list, sorry for that...
>
> Thanks Marcos,
>
> but if I apply your suggestion, the following error occurs:
>
> The used GS call (The _PRINT_FILE is the generated temporary file from the
> printer by Redmon):
> gswin32c.exe -dSAFER -dNOPAUSE -dBATCH -sDEVICE=tiffg4 -r200 -c "<< /Install
> { { 0.85 gt {1 } { 0 } ifelse } settransfer } >> setpagedevice"
> -sOutputFile=%P2MFILE% %_PRINT_FILE% >> %LOGFILE%
>
> The error message:
> Error: /undefined in II*
> Operand stack:
> Execution stack:
>    %interp_exit  .runexec2  --nostringval--  --nostringval--
> --nostringval--  2  %stopped_push  --nostringval--  --nostringval--
> --nostringval--  false  1  %stopped_push  1905  1  3  %oparray_pop
> 1904  1  3  %oparray_pop  1888  1  3  %oparray_pop  1771  1  3
> %oparray_pop  --nostringval--  %errorexec_pop  .runexec2
> --nostringval--  --nostringval--  --nostringval--  2  %stopped_push
> --nostringval--
> Dictionary stack:
>    --dict:1152/1684(ro)(G)--  --dict:0/20(G)--  --dict:70/200(L)--
> Current allocation mode is local
> Current file position is 4
>
>
> While searching the web I found a hint that the redmon input file seems not
> to have the expected file format. Do I have to manually alter the file
> before the GS processing occurs? Without your suggested parameters the error
> message does not occur.
>
> kind regards,
> Werner
>
>
>
> ----- Original Message ----
> From: Marcos H. Woehrmann <marcos.woehrmann@...>
> To: Werner Heinsohn <werner.heinsohn@...>
> Cc: gs-devel@...
> Sent: Monday, September 15, 2008 3:57:03 AM
> Subject: Re: [gs-devel] xefitra - dithered gray fonts unreadable
>
> Werner,
>
> You can add a statement to the command line to convert all grays that
> are darker than a specified value to black and all others to white by
> setting a transfer function.
>
> E.g.
>
> gs-sDEVICE=tiffg4 -sOutputFile=test.tif -c "<< /Install { { 0.85 gt {
> 1 } { 0 } ifelse } settransfer } >> setpagedevice" -f test.ps
>
> You can change the 0.85 value to vary the point where gray turns to
> black or white.
>
> marcos
>
> 2008/9/11 Werner Heinsohn <werner.heinsohn@...>:
>> Hello,
>>
>> I'm using GhostScript to print documents as a tiff file. The output only
>> has
>> to be a monochrom image, therefore the used device is "tiffg4". But if GS
>> encounters documents with gray fonts it dithers it to only a few dots, so
>> the text is nearly impossible to read. This issue could be due to a
>> resolution of just 200dpi, but this should be kept that way, if possible.
>>
>> If there an option to automatically convert all gray texts to black texts?
>>
>> I'm using the following command:
>> gswin32c.exe -dSAFER -dNOPAUSE -dBATCH -sDEVICE=tiffg4 -r200
>>
>>
>> I really would appreciate it, if someone could help me on this issue.
>>
>> Thanks and kind regards
>> Werner Heinsohn
>>
>>
>> _______________________________________________
>> gs-devel mailing list
>> gs-devel@...
>> http://www.ghostscript.com/mailman/listinfo/gs-devel
>>
>>
>
>
>
> --
> Marcos H. Woehrmann
> marcos.woehrmann@...
>
>
>
> _______________________________________________
> gs-devel mailing list
> gs-devel@...
> http://www.ghostscript.com/mailman/listinfo/gs-devel
>
>

--
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[Ray Johnston]

Some parts of this message have been removed. Learn more about Nabble's security policy.

Hi Werner.

It seems clear from the traffic on this thread that you really need more
support than is usual from Artifex for free users.

While there are solutions to doing what you need (see the object tagging
code and gs_img.ps), these require an understanding of PostScript and
Ghostscript that transcend what we provide for free users.

If you are working for a supported Artifex customer, please let us know.

In the meantime, there is probably enough information already on this
thread to allow some of the contributors to free (GPL) Ghostscript to
help you.

Best Regards,
Ray

---

Werner Heinsohn wrote:

Can someone help me with this issue?
The text fonts should be processed with the command 'gs <options> -c "<< /Install ... >> setpagedevice" -f input_filename'
...while the images get dithered in the normal "sDEVICE=tiffg4" process.

Is this possible? I also looked through the EPS file to maybe find a way to accomplish the goal, but the syntax seems to be too complex.

best regards,
Werner

----- Original Message ----
From: Werner Heinsohn werner.heinsohn@...
To: Marcos H. Woehrmann marcos.woehrmann@...
Cc: gs-devel@...
Sent: Tuesday, September 16, 2008 9:28:14 AM
Subject: Re: [gs-devel] xefitra - dithered gray fonts unreadable

Hello,

in the right order, the command workes great. But I noticed that images which were dithered before, now turn completly black. Is there a way to treat font text differently that images? The perfect way would be to process images "in the old way" and text with the new settransfer command. Is that possible?

Thanks and kind regards
Werner

----- Original Message ----
From: Marcos H. Woehrmann marcos.woehrmann@...
To: Werner Heinsohn werner.heinsohn@...
Cc: gs-devel@...
Sent: Monday, September 15, 2008 4:35:40 PM
Subject: Re: [gs-devel] xefitra - dithered gray fonts unreadable

Werner,

I think the problem is the command line order and the missing -f
before the input filename, try putting the commands in the following
order:

  gs <options> -c "<< /Install ... >> setpagedevice" -f input_filename

marcos

2008/9/15 Werner Heinsohn <werner.heinsohn@...>:
> Oh! I didn't send it to the list, sorry for that...
>
> Thanks Marcos,
>
> but if I apply your suggestion, the following error occurs:
>
> The used GS call (The _PRINT_FILE is the generated temporary file from the
> printer by Redmon):
> gswin32c.exe -dSAFER -dNOPAUSE -dBATCH -sDEVICE=tiffg4 -r200 -c "<< /Install
> { { 0.85 gt {1 } { 0 } ifelse } settransfer } >> setpagedevice"
> -sOutputFile=%P2MFILE% %_PRINT_FILE% >> %LOGFILE%
>
> The error message:
> Error: /undefined in II*
> Operand stack:
> Execution stack:
>    %interp_exit  .runexec2  --nostringval--  --nostringval--
> --nostringval--  2  %stopped_push  --nostringval--  --nostringval--
> --nostringval--  false  1  %stopped_push  1905  1  3  %oparray_pop
> 1904  1  3  %oparray_pop  1888  1  3  %oparray_pop  1771  1  3
> %oparray_pop  --nostringval--  %errorexec_pop  .runexec2
> --nostringval--  --nostringval--  --nostringval--  2  %stopped_push
> --nostringval--
> Dictionary stack:
>    --dict:1152/1684(ro)(G)--  --dict:0/20(G)--  --dict:70/200(L)--
> Current allocation mode is local
> Current file position is 4
>
>
> While searching the web I found a hint that the redmon input file seems not
> to have the expected file format. Do I have to manually alter the file
> before the GS processing occurs? Without your suggested parameters the error
> message does not occur.
>
> kind regards,
> Werner
>
>
>
> ----- Original Message ----
> From: Marcos H. Woehrmann <marcos.woehrmann@...>
> To: Werner Heinsohn <werner.heinsohn@...>
> Cc: gs-devel@...
> Sent: Monday, September 15, 2008 3:57:03 AM
> Subject: Re: [gs-devel] xefitra - dithered gray fonts unreadable
>
> Werner,
>
> You can add a statement to the command line to convert all grays that
> are darker than a specified value to black and all others to white by
> setting a transfer function.
>
> E.g.
>
> gs-sDEVICE=tiffg4 -sOutputFile=test.tif -c "<< /Install { { 0.85 gt {
> 1 } { 0 } ifelse } settransfer } >> setpagedevice" -f test.ps
>
> You can change the 0.85 value to vary the point where gray turns to
> black or white.
>
> marcos
>
> 2008/9/11 Werner Heinsohn <werner.heinsohn@...>:
>> Hello,
>>
>> I'm using GhostScript to print documents as a tiff file. The output only
>> has
>> to be a monochrom image, therefore the used device is "tiffg4". But if GS
>> encounters documents with gray fonts it dithers it to only a few dots, so
>> the text is nearly impossible to read. This issue could be due to a
>> resolution of just 200dpi, but this should be kept that way, if possible.
>>
>> If there an option to automatically convert all gray texts to black texts?
>>
>> I'm using the following command:
>> gswin32c.exe -dSAFER -dNOPAUSE -dBATCH -sDEVICE=tiffg4 -r200
>>
>>
>> I really would appreciate it, if someone could help me on this issue.
>>
>> Thanks and kind regards
>> Werner Heinsohn
>>
>>
>> _______________________________________________
>> gs-devel mailing list
>> gs-devel@...
>> http://www.ghostscript.com/mailman/listinfo/gs-devel
>>
>>
>
>
>
> --
> Marcos H. Woehrmann
> marcos.woehrmann@...
>
>
>
> _______________________________________________
> gs-devel mailing list
> gs-devel@...
> http://www.ghostscript.com/mailman/listinfo/gs-devel
>
>



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[Ken Sharp]

At 03:07 19/09/2008 -0700, Werner Heinsohn wrote:


>Can someone help me with this issue?
>The text fonts should be processed with the command 'gs <options> -c "<<
>/Install ... >> setpagedevice" -f input_filename'
>...while the images get dithered in the normal "sDEVICE=tiffg4" process.
>
>Is this possible? I also looked through the EPS file to maybe find a way
>to accomplish the goal, but the syntax seems to be too complex.

PostScript doesn't have different colours for different objects, so no, you
can't apply different transfer functions for text, images and linework.

You could write a device for Ghostscript to do this, but it would probably
be more effort than its worth.

You could redefine all the text operators so that they set the current
colour to black, something like:

/oldshow /show load bind def

/show {
   gsave
   0 0 0 1 setcmykcolor
   oldshow
   grestore
} bind def

Obviously you could instead modify the image operators.

If you don't have too many files to deal with, and you have a copy of
Acrobat, you could convert the files to PDF, open them in Acrobat, and
modify the text colours.


                 Ken

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