On Jan 16, 2008, at 9:14 PM, Alan W. Irwin wrote:
On 2008-01-16 20:03-0500 Hazen Babcock wrote:I tried that, as you can see in the code in example 30, but it does not work for me. I can still see faint black lines separating the different colors. Does it work for you?I attach the result for the second page for the png (not pngcairo) device so you can be the judge. I don't see any extraneous black lines here, but OTOH, it is mostly just a big red blob with some minor transparency effects so perhaps something is not working quite correctly for the second page for the png device. Alternatively, it may be working correctly and you just haven't yet had a chance to design a dramatic range of colours to accentuatethe transparency effects.
It looks like this driver scales alpha values in a different way than the cairo drivers.
I also tried it for the psc device. That device is not alpha- enabled yet, but it was interesting that the second page (literally just a red rectangle for this special case of non-enabled device) had black lines in it (where the black background leaked through) with antialiasing turned on. The lines disappeared with antialiasing turned off so you may also need to turn offantialiasing to get rid of the black lines for cairo devices.
That (anti-aliasing) does seem to be the problem, thanks! I've attached example 30 page 2 from pngcairo for comparison purposes with the png device.
-Hazen
<<inline: ex30-2.png>>
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