[Printing-architecture] pwgtoraster vs calibrated spaces

[Michael Sweet]

James,

A simple search of "sgray color space" yields a page of links that all mention sGray as a version of sRGB.  And while I respect the work that the Ghostscript developers do, their support for sGray came long after it was already in gdevcups and the rest of the raster filters used by CUPS.  I would suggest filing a bug with the Ghostscript developers...


On Jun 2, 2014, at 2:24 PM, James Cloos <cloos at jhcloos.com> wrote:

>>>>>> "MS" == Michael Sweet <msweet at apple.com> writes:
> 
> MS> What standard defines sGray?
> 
> Every search I did returned gs's sgray (which is a simple 2.2 with the
> whitepoint I mentioned) and references to multi-ink black-and-white
> photograph printing which all said 2.2.  I do not recall mention of
> the whitepoint for most of the latter, but one implied Lab(1.0,0.0,0.0).
> (or Lab(100.0,0.0,0.0) if one prefers [0 100 -127 127 -127 127].)
> 
> I didn't see *any* search results referencing srgb's transfer function
> except the cupsraster document.  The pwg raster document didn't show
> up in the search.
> 
> I found no evidence, when I searched, that Apple prefers otherwise.
> And some of the photographers mentioned using osx.
> 
> -JimC
> --
> James Cloos <cloos at jhcloos.com>         OpenPGP: 0x997A9F17ED7DAEA6

_________________________________________________________
Michael Sweet, Senior Printing System Engineer, PWG Chair

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