I have now investigated the color errors in Adobe Reader further.
I produced a test PDF without simpleslides with MKIV (mtx-context | current version: 2011.09.10 12:55).

Here is the source:

vardef ColorCircle (expr method, factor, ca, cb, cc) =
save u, p ; path p ; p := fullcircle shifted (1/4,0);
image (fill p rotated 90 withcolor transparent(method,factor,ca); fill p rotated 210 withcolor transparent(method,factor,cb); fill p rotated 330 withcolor transparent(method,factor,cc))
draw ColorCircle ("normal", 1, cyan, magenta, yellow) xsized 6cm;
draw ColorCircle ("darken", .85, cyan, magenta, yellow) xsized 6cm;
currentpicture := currentpicture shifted (0,-6cm);
draw ColorCircle ("exclusion", 1, red, green, blue) xsized 6cm;

and here is the output:

You can also see the original files used in the test here:

The gray background effect happens randomly even with only using svg images straight from inkscape. When using png images, I noticed it happens more often when there are multiple layers in the png. With metafun graphics, the image colors are messed up in addition to the gray background.

I would like to know:

a) How to avoid it with metafun, png AND svg graphics?
b) What is the cause (Adobe reader bugs? Errors in my source? Erroneous image files? ConTeXt bug?)

Best regards,
Otso Helenius
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