[Openicc] colord Printing Plans

[Michael Vrhel]

Wow.  I missed out on a nice conversation.

Just a few comments so that everyone understands how ghostscript deals with
color management for PS and PDF.   Every color is defined in terms of an ICC
profile.   If the source color is DeviceRGB, DeviceGray or DeviceCMYK it
will be assigned an ICC profile, which can be specified on the command
line.  If one is not specified then a default one will be used (sRGB,
SWOPCMYK, sgray).

If we have a PS color space that is CIEA, CIEABC, CIEDEF(G) an equivalent
ICC profile is created so that the same CMM can handle all color management
and need not worry about PS color management.  The same occurs for CalGray
and CalRGB PDF color spaces.  Shortly, I will be adding the ability to
specify device profiles based upon object types.  In this case, different
device profiles can be used for images, text, and graphic objects.  This
makes it easier to maintain nice black text and nice images.

Michael

On Thu, Feb 24, 2011 at 5:11 PM, Graeme Gill <graeme at argyllcms.com> wrote:

> Chris Murphy wrote:
>
>> I admit this is unique on Linux. On Mac OS and Windows, the legacy RGB
>> path is not
>> PostScript but QuickDraw and GDI, and for Mac OS today now that QuickDraw
>> is deprecated
>> it is Quartz which can do either RGB or CMYK.
>>
>
> This may be so for color unsophisticated applications, but anything
> sophisticated
> has used "PostScript Bypass" to inject its own PS into the print job on
> MSWin and Mac.
>
>
>  it in the first place. If the application is seriously producing untagged
>> data across
>> the board including saving out its own document format, then neither that
>> developer nor
>> its users really care one bit about color. I am not opposed to the idea of
>> building
>>
>
> This isn't strictly true. They expect DeviceXXX to be a "reasonable" color
> space,
> not the actual device colorspace. For RGB that means something that
> compares
> to what they see on their display. For CMYK, that means something that
> compares
> to a standard printing press or the Pantone CMYK swatches. Any system that
> is to be
> regarded as having satisfactory color, meets these expectations. (Take that
> as a
> lesson from spending 10 years developing PS RIPS).
>
> Graeme Gill.
>
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