Post any defects you find in the released or beta versions of the ImageMagick software here. Include the ImageMagick version, OS, and any command-line required to reproduce the problem. Got a patch for a bug? Post it here.
I could be wrong here. But I was under the impression that IM has for some time now, when using -channel a -separate, gives the transparency channel. But it seems to be giving the opacity channel. Was this not switched a while ago? Or am I mis-remembering?
convert alpha3.png -channel a -separate alpha3_alpha.png
convert alpha3_blue.png -channel a -separate alpha_blue_alpha.png
The above is extracting the opacity and not the transparency. Did you not switch this so that we get the transparency? Or is that only to come in IM 7?
Last edited by fmw42 on 2012-05-03T20:50:23-07:00, edited 2 times in total.
magick wrote:We can reproduce the problem you reported and have a patch. Look for it in the ImageMagick 6.7.6-8 release.
Don't change anything without further discussion with Anthony. I actually think I am wrong about this.
I think it has been opacity all the time. I think I am confusing using -channel a -separate with -alpha extract. The former gets the opacity and the latter gets the transparency.
