[Printing-architecture] CUPS and color management

[Printing-architecture] CUPS and color management

[Pascal Obry]

Hello,

I have a question regarding color management with CUPS. I need to print
a raster image (jpeg, tiff) which has already been converted with the
printer profile. The printing is done using the CUPS API
(cupsPrintFile). I want to ensure that NO color management is done by
CUPS or any filters.

Is there something to do? If so What do I need to do?

Thanks,

-- 
  Pascal Obry /  Magny Les Hameaux (78)

  The best way to travel is by means of imagination

  http://v2p.fr.eu.org
  http://www.obry.net

  gpg --keyserver keys.gnupg.net --recv-key F949BD3B

Re: [Printing-architecture] CUPS and color management

[Ira McDonald]

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Hi Pascal,

Copying Mike Sweet (CUPS author) for the answer to you question.

Cheers,
- Ira


Ira McDonald (Musician / Software Architect)
Co-Chair - TCG Trusted Mobility Solutions WG
Chair - Linux Foundation Open Printing WG
Secretary - IEEE-ISTO Printer Working Group
Co-Chair - IEEE-ISTO PWG Internet Printing Protocol WG
IETF Designated Expert - IPP & Printer MIB
Blue Roof Music / High North Inc
http://sites.google.com/site/blueroofmusic
http://sites.google.com/site/highnorthinc
mailto: blueroofmusic@gmail.com
Winter  579 Park Place  Saline, MI  48176  734-944-0094
Summer  PO Box 221  Grand Marais, MI 49839  906-494-2434



On Mon, Jul 7, 2014 at 11:47 AM, Pascal Obry <pascal@obry.net> wrote:

>
> Hello,
>
> I have a question regarding color management with CUPS. I need to print
> a raster image (jpeg, tiff) which has already been converted with the
> printer profile. The printing is done using the CUPS API
> (cupsPrintFile). I want to ensure that NO color management is done by
> CUPS or any filters.
>
> Is there something to do? If so What do I need to do?
>
> Thanks,
>
> --
>   Pascal Obry /  Magny Les Hameaux (78)
>
>   The best way to travel is by means of imagination
>
>   http://v2p.fr.eu.org
>   http://www.obry.net
>
>   gpg --keyserver keys.gnupg.net --recv-key F949BD3B
>
> _______________________________________________
> Printing-architecture mailing list
> Printing-architecture@lists.linux-foundation.org
> https://lists.linuxfoundation.org/mailman/listinfo/printing-architecture
>

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Re: [Printing-architecture] CUPS and color management

[Michael Sweet]

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Ira,

I'm on this list too, and I sent Pascal here because I don't know the answer... :/  There was discussion of adding an option for this just recently, but I just don't know what the final option name is...


On Jul 8, 2014, at 11:12 AM, Ira McDonald <blueroofmusic@gmail.com> wrote:

> Hi Pascal,
> 
> Copying Mike Sweet (CUPS author) for the answer to you question.
> 
> Cheers,
> - Ira
> 
> 
> Ira McDonald (Musician / Software Architect)
> Co-Chair - TCG Trusted Mobility Solutions WG
> Chair - Linux Foundation Open Printing WG
> Secretary - IEEE-ISTO Printer Working Group
> Co-Chair - IEEE-ISTO PWG Internet Printing Protocol WG
> IETF Designated Expert - IPP & Printer MIB
> Blue Roof Music / High North Inc
> http://sites.google.com/site/blueroofmusic
> http://sites.google.com/site/highnorthinc
> mailto: blueroofmusic@gmail.com
> Winter  579 Park Place  Saline, MI  48176  734-944-0094
> Summer  PO Box 221  Grand Marais, MI 49839  906-494-2434
> 
> 
> 
> On Mon, Jul 7, 2014 at 11:47 AM, Pascal Obry <pascal@obry.net> wrote:
> 
> Hello,
> 
> I have a question regarding color management with CUPS. I need to print
> a raster image (jpeg, tiff) which has already been converted with the
> printer profile. The printing is done using the CUPS API
> (cupsPrintFile). I want to ensure that NO color management is done by
> CUPS or any filters.
> 
> Is there something to do? If so What do I need to do?
> 
> Thanks,
> 
> --
>   Pascal Obry /  Magny Les Hameaux (78)
> 
>   The best way to travel is by means of imagination
> 
>   http://v2p.fr.eu.org
>   http://www.obry.net
> 
>   gpg --keyserver keys.gnupg.net --recv-key F949BD3B
> 
> _______________________________________________
> Printing-architecture mailing list
> Printing-architecture@lists.linux-foundation.org
> https://lists.linuxfoundation.org/mailman/listinfo/printing-architecture
> 

_________________________________________________________
Michael Sweet, Senior Printing System Engineer, PWG Chair


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Re: [Printing-architecture] CUPS and color management

[Ira McDonald]

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Hi Pascal and Mike,

[Thanks Mike for the pointer - I think I've tracked down the answer]

The result of the recent Open Printing thread on "no color management"
was this note sent by Joe Simon on 12 June:

Hi everyone,

Rev. 7225 of 'cups-filters' now replaces "no-color-management" with
"cm-calibration" for the bool option. So the following commands should work
without the added '=' symbol, and will disable ICC profile management:

$ rastertopdf 1 foo bar 1 "cm-calibration" input.ras >>output.pdf
$ foomatic-rip -p foo -o cm-calibration

Joe Simon

Cheers,
- Ira


On Tue, Jul 8, 2014 at 11:20 AM, Michael Sweet <msweet@apple.com> wrote:

> Ira,
>
> I'm on this list too, and I sent Pascal here because I don't know the
> answer... :/  There was discussion of adding an option for this just
> recently, but I just don't know what the final option name is...
>
>
> On Jul 8, 2014, at 11:12 AM, Ira McDonald <blueroofmusic@gmail.com> wrote:
>
> Hi Pascal,
>
> Copying Mike Sweet (CUPS author) for the answer to you question.
>
> Cheers,
> - Ira
>
>
> Ira McDonald (Musician / Software Architect)
> Co-Chair - TCG Trusted Mobility Solutions WG
> Chair - Linux Foundation Open Printing WG
> Secretary - IEEE-ISTO Printer Working Group
> Co-Chair - IEEE-ISTO PWG Internet Printing Protocol WG
> IETF Designated Expert - IPP & Printer MIB
> Blue Roof Music / High North Inc
> http://sites.google.com/site/blueroofmusic
> http://sites.google.com/site/highnorthinc
> mailto: blueroofmusic@gmail.com
> Winter  579 Park Place  Saline, MI  48176  734-944-0094
> Summer  PO Box 221  Grand Marais, MI 49839  906-494-2434
>
>
>
> On Mon, Jul 7, 2014 at 11:47 AM, Pascal Obry <pascal@obry.net> wrote:
>
>>
>> Hello,
>>
>> I have a question regarding color management with CUPS. I need to print
>> a raster image (jpeg, tiff) which has already been converted with the
>> printer profile. The printing is done using the CUPS API
>> (cupsPrintFile). I want to ensure that NO color management is done by
>> CUPS or any filters.
>>
>> Is there something to do? If so What do I need to do?
>>
>> Thanks,
>>
>> --
>>   Pascal Obry /  Magny Les Hameaux (78)
>>
>>   The best way to travel is by means of imagination
>>
>>   http://v2p.fr.eu.org
>>   http://www.obry.net
>>
>>   gpg --keyserver keys.gnupg.net --recv-key F949BD3B
>>
>> _______________________________________________
>> Printing-architecture mailing list
>> Printing-architecture@lists.linux-foundation.org
>> https://lists.linuxfoundation.org/mailman/listinfo/printing-architecture
>>
>
>
>  _________________________________________________________
> Michael Sweet, Senior Printing System Engineer, PWG Chair
>
>

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Re: [Printing-architecture] CUPS and color management

[Pascal Obry]

Hi Ira, 
> Rev. 7225 of 'cups-filters' now replaces "no-color-management" with
> "cm-calibration" for the bool option. So the following commands should
> work without the added '=' symbol, and will disable ICC profile
> management:
> 
> 
> $ rastertopdf 1 foo bar 1 "cm-calibration" input.ras >>output.pdf
> 
> $ foomatic-rip -p foo -o cm-calibration
> 
> 
> Joe Simon

Hum... I'm new to CUPS :) So how does that translate in terms of CUPS
API?

Is the cm-calibration just a regular option?

So, should I just do:

  num_options = cupsAddOption("cm-calibration",
                              "false",
                              num_options, &options);

And pass num_optionss & options to cupsPrintFile()?

Cheers,
Pascal. 
-- 
  Pascal Obry /  Magny Les Hameaux (78)

  The best way to travel is by means of imagination

  http://v2p.fr.eu.org
  http://www.obry.net

  gpg --keyserver keys.gnupg.net --recv-key F949BD3B

Re: [Printing-architecture] CUPS and color management

[Ira McDonald]

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Hi Joe,

Can you answer Pascal's question below, please?

Cheers,
- Ira



On Tue, Jul 8, 2014 at 11:51 AM, Pascal Obry <pascal@obry.net> wrote:

>
> Hi Ira,
> > Rev. 7225 of 'cups-filters' now replaces "no-color-management" with
> > "cm-calibration" for the bool option. So the following commands should
> > work without the added '=' symbol, and will disable ICC profile
> > management:
> >
> >
> > $ rastertopdf 1 foo bar 1 "cm-calibration" input.ras >>output.pdf
> >
> > $ foomatic-rip -p foo -o cm-calibration
> >
> >
> > Joe Simon
>
> Hum... I'm new to CUPS :) So how does that translate in terms of CUPS
> API?
>
> Is the cm-calibration just a regular option?
>
> So, should I just do:
>
>   num_options = cupsAddOption("cm-calibration",
>                               "false",
>                               num_options, &options);
>
> And pass num_optionss & options to cupsPrintFile()?
>
> Cheers,
> Pascal.
> --
>   Pascal Obry /  Magny Les Hameaux (78)
>
>   The best way to travel is by means of imagination
>
>   http://v2p.fr.eu.org
>   http://www.obry.net
>
>   gpg --keyserver keys.gnupg.net --recv-key F949BD3B
>
>

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Re: [Printing-architecture] CUPS and color management

[Michael Sweet]

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Pascal,

On Jul 8, 2014, at 11:51 AM, Pascal Obry <pascal@obry.net> wrote:
> ...
> Is the cm-calibration just a regular option?

Yes; at the IPP level it is a boolean attribute.

> So, should I just do:
> 
>  num_options = cupsAddOption("cm-calibration",
>                              "false",
>                              num_options, &options);

Use "true" for the value (otherwise the filter will see "nocm-calibration"...)

> And pass num_optionss & options to cupsPrintFile()?

Yes.

_________________________________________________________
Michael Sweet, Senior Printing System Engineer, PWG Chair


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Re: [Printing-architecture] CUPS and color management

[Pascal Obry]

Michael,

> On Jul 8, 2014, at 11:51 AM, Pascal Obry <pascal@obry.net> wrote:
> > ...
> > Is the cm-calibration just a regular option?
> 
> Yes; at the IPP level it is a boolean attribute.
> 
> > So, should I just do:
> > 
> >  num_options = cupsAddOption("cm-calibration",
> >                              "false",
> >                              num_options, &options);
> 
> Use "true" for the value (otherwise the filter will see "nocm-calibration"...)

Makes sense indeed! Thanks a lot to all for the quick help.

Cheers,

-- 
  Pascal Obry /  Magny Les Hameaux (78)

  The best way to travel is by means of imagination

  http://v2p.fr.eu.org
  http://www.obry.net

  gpg --keyserver keys.gnupg.net --recv-key F949BD3B