[Openicc] Linux printing

[Michael Vrhel]

On Tue, Feb 28, 2012 at 9:08 AM, Chris Murphy <lists at colorremedies.com>wrote:

>
>
> On Feb 27, 2012, at 10:52 PM, Michael Vrhel wrote:
>
> > It is not true that Ghostscript will assume DeviceRGB is sRGB.
>  Ghostscript can be specified to use specific ICC profiles for DeviceGray,
> DeviceRGB and DeviceCMYK.  In fact, Ghostscript can have different source
> ICC profiles specified for different graphic types (e.g. text, graphics and
> images in DeviceRGB and DeviceCMYK color spaces).   These can even override
> ICC profiles that are internally specified within the document.    Object
> dependent ICC profiles can also be specified for the output device ICC
> profile and DeviceN source color spaces can be specified with external ICC
> profiles.
>
> For what it's worth, the idea of overriding embedded profiles in a
> document is a big problem. If the wrong source profile is embedded, the PDF
> needs to print like crap, and the offending user or application that
> produced the PDF needs to fix their error.
>

The fact is that the world is a big place and there are software RIP
vendors that use Ghostscript in their products and they need to have this
capability.   It is an option that one has available and requires a special
command line option to invoke.  In its vanilla calling form, Ghostscript
makes use of all the embedded ICC profiles in PDF.


>
> Hacks that ignore embedded profiles is what destroyed the original PNG
> based color management implementation. Apps wrote out PNGs with bogus color
> information, and when honored by viewing applications the images looked
> whacky. So PNG viewer application developers started to ignore the
> color/gamma metadata in PNG, rendering that whole paradigm entirely useless.
>
> Second guessing embedded metadata is just like second guessing actual
> data. Apps, RIPs, printers themselves are not ignoring RGB 232, 50, 100 in
> favor of some other values. They should not be ignoring embedded profiles
> in favor of some other values either.
>
> The mere option of overriding embedded profiles is like handing developers
> and users razor blades and telling them to go play out on the freeway. It
> will regress the consistency of color management, by making it even less
> consistent than it already is.
>

My comment on your analogy is to say that if one doesn't know the proper
way to use a tool and fails to RTFM then you deserve what you get, which is
cut and run over :) .   By default Ghostscript is designed to honor all the
embedded color information.

>
> Chris Murphy
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