[poppler] Testing color management functionality

[Leonard Rosenthol]

The overprint tests are something that will only work on devices that
support Overprint (or Overprint simulation, in the case of Adobe
Acrobat/Reader) - this is beyond the normal "color management" work.

I would work on color management WITHOUT transparency first - it's much
simpler. Once you have that working, then you can work on how CM integrates
with the PDF transparency model (of which Poppler only does about 1%).

Leonard

On Wed, May 13, 2009 at 2:28 PM, Hal V. Engel <hvengel at astound.net> wrote:

> Now that it looks like the color management support will be released with
> version 0.12 I decided to do some more testing.  I did this testing using a
> patched version of the Qt4 demo viewer (the same patch set I sent to the
> email
> list on Monday) using the altona pdf test suite
> http://www.eci.org/doku.php?id=en:downloads.  This test suite has tests
> for
> many things but I was only interested in those that were related to color
> rendering.
>
> The most significant issues are with the following test elements:
>
> #26 "Duotone and Spot Color"  Poppler fails the spot color test but appears
> to
> work for the doutone test.
>
> #27 "Overprinting spot color and process color black"  Only the overprinted
> color is displayed.
>
> #28 "Overprinting process colors only"  Only the overprinted color is
> displayed.
>
> #34 through #38 These are renderings involving different source color
> spaces
> and/or different rendering intents.  Currently the color management code in
> poppler does not handle rendering intents and this shows up in tests #35
> through #38.  But it also appears that CM is not functioning at all for
> vector
> elements (test #34).
>
> The altone test suite appears to be comprehensive and is a harsh test of
> any
> PDF rendering engine but it should help to find and correct rendering
> issues
> since each test element only tests a specific well documented feature.
>
> Not all of the above issues are specifically color management problems.
>  #34
> through #38 are definitely color management issues and #26 (spot color) may
> also be a color management issue.  #27 and #28 may be transparency issues
> but
> may also be impacted by color management.
>
> I think one goal for v 0.12 should be for poppler to be able to pass all
> (or
> maybe most) of the above tests.
>
> Hal
>
> PS: Does anyone have a time frame for when my patches or derivatives of
> those
> patches will be applied to git?
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