Created attachment 9837 gcolor3 xwd & gimp snapshot I was impressed, how pantheon's screenshot-tool takes isolated rgba images from gtk3 apps, including transparent shadows, created by gtk stylesheet. It did same in xfce as well, not just pantheon (so, it probably doesn't use special wm support). In contrast, xfce4-screenshooter seem to just make desktop region, automatically set to window geometry. Yesterday I noticed and tried xwd. Images from this tool are transparent only if shoted window is unobstructed. In case of gtk3 app with csd - obstructing shadow part is enough, in this case image gets black background, yet ubstructed region is not recorded (also black) - visible if you obstruct part of window itself. I'm not sure, was it case for pantheon screenshot tool, and thus is there better way to make such window screenshots. So for now I consider window dumps for proposal. P.S. When I searched how to convert xwd to popular format, it was strange to know, that imagemagick doesn't preserve alpha (even as "import -window ID"), as much as some online image convertion services (though gimp does).
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