possible bug -fill none IM 6.7.6.5 Q16

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fmw42
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possible bug -fill none IM 6.7.6.5 Q16

Post by fmw42 »

IM 6.7.6.5 Q16 Mac OSX Snow Leopard

I was under the impression that all commands (which use none or transparent) such as -fill none were fixed to promote the alpha channel automatically. Correct me if I am wrong.

Thus this should work, but does not.

convert logo: -fill none -opaque white show:


I know it can be made to work using

convert logo: -channel rgba -fill none -opaque white show:
or
convert logo: -transparent white show:
Last edited by fmw42 on 2012-04-14T13:59:22-07:00, edited 1 time in total.
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magick
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Re: possible but -fill none IM 6.7.6.5 Q16

Post by magick »

Many of the ImageMagick algorithms are channel aware and the default is RGB. You must add -channel rgba to your command line. ImageMagick version 7 removes the need to specify the channels and automatically processes the alpha channel if its available.
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