[Openicc] cups-filters

[Joseph Simon]

Hello Till,

The handling of sRGB, sGray, and AdobeRGB in rastertopdf has been updated
in revision 7248 of cups-filters.

For both sGray and AdobeRGB, the PDF '/ColorSpace' is set to /CalGray and
/CalRGB, respectively, and are given the appropriate whitepoint/gamma
values.

For sRGB, the '/ColorSpace' references an /ICCBased array object, which in
the PDF will include an embedded sRGB profile in its stream (using LCMS to
create the profile).

Joseph Simon


On Thu, May 15, 2014 at 6:35 AM, Till Kamppeter <till.kamppeter at gmail.com>
wrote:

> Hi Joseph,
>
> did you already have a look into filters of cups-filters and whether
> they do correctly with color management?
>
> Also I have today committed a new rastertopdf filter to turn PWG Raster
> input into PDF output. This works well if the input file is in Black,
> RGB, or CMYK color space with 1 or 8 bits per component color depth. The
> resulting PDF is in DeviceGray, DeviceRGB, or DeviceCMYK color space
> then. How do I proceed with sGray, sRGB, and Adobe RGB? Simply using
> DeviceGray, DeviceRGB gives broken output and is probably wrong in terms
> of color management. What is correct here. Also 16 bit color depth with
> Black and RGB gives broken output.
>
>    Till
>
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