IM7 regression with "-composite" ?

[Marsu42]

This works on version 6, the wizard is added to the canvas just as expected:

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convert.exe -size 800x800 canvas:transparent wizard: -composite wizard6.png

The same command sequence fails with version 7 (ImageMagick-7.0.3-1-Q16-HDRI-x64-dll.exe or ImageMagick-7.0.3-1-Q8-x64-dll.exe) ... the output is just a transparant canvas with no composited wizard to be seen:

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magick.exe -size 800x800 canvas:transparent wizard: -composite wizard7.png

Is this a bug (& sorry for choosing the wrong forum), or am I missing something and v7 is not meant as a drop-in replacement for v6? Thanks.

[GeeMack]

Is this a bug (& sorry for choosing the wrong forum), or am I missing something and v7 is not meant as a drop-in replacement for v6? Thanks.

Almost, but there are some times when using IM7 that you'll have to specify an image has an aplha channel. Try this...

Code: Select all

magick -size 800x800 canvas:transparent wizard: -alpha on -composite wizard7.png

[fmw42]

I would consider this a bug, in my opinion. It fails for me on IM 7.0.3.1 Q16 Mac OSX.

[snibgo]

The OP command works fine for me, v7.0.2-5. A recent bug, I assume.

[Marsu42]

Is this a bug (& sorry for choosing the wrong forum), or am I missing something and v7 is not meant as a drop-in replacement for v6? Thanks.

Almost, but there are some times when using IM7 that you'll have to specify an image has an aplha channel.

Thanks, I would have never gotten that idea, it's working now.

Still, if someone wants to move this to the "bugs" subforum go ahead as it's not 1:1 im6->im7 behavior (though this seems to be known to some).

[GeeMack]

Still, if someone wants to move this to the "bugs" subforum...

I opened a thread in Bugs describing this issue.