Warn on attempts at semi-transparent outputs in ps backend. #13605
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The postscript format does not support transparency at all; the postscript backend currently silently ignores the alpha channel (except if alpha = 0 in which case the artist is not drawn). Log a warning when this happens so that the user knows what happened. Small refactor of transparency handling in the backend.
timhoffm
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Mar 6, 2019
meeseeksmachine
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Mar 6, 2019
…tputs in ps backend.
dstansby
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Mar 6, 2019
…605-on-v3.1.x Backport PR #13605 on branch v3.1.x (Warn on attempts at semi-transparent outputs in ps backend.)
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The postscript format does not support transparency at all; the
postscript backend currently silently ignores the alpha channel
(except if alpha = 0 in which case the artist is not drawn).
Log a warning when this happens so that the user knows what happened.
Small refactor of transparency handling in the backend.
See https://stackoverflow.com/questions/29321707/can-transparency-be-used-with-postscript-eps.
"Closes" #13604 by documenting the limitation.
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