composite -dissolve is bugged

[BrainwreckedTech]

Upgrading to version 7.0.8.6, composite -dissolve is bugged

This works as expected:

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composite -gravity northeast -geometry +16+0 [over-image] [under-image] tiff:-

This does not:

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composite -dissolve 100 -gravity northeast -geometry +16+0 [over-image] [under-image] tiff:-

Version 7.0.8.5 works fine.

[BrainwreckedTech]

I wish I could be more detailed, but I keep having to re-login if I do. Seems to be a very short session duration. :\

[fmw42]

In Imagemagick 7, you should append composite with magick (magick composite) otherwise you are actually using IM 6.

Nevertheless, using IM 6.9.10.6 and IM 7.0.8.6 Mac OSX Sierra and trying both composite and convert syntax, the only one that works properly is IM 6 convert.


Input:

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composite -dissolve 100 -gravity northeast -geometry +16+0 lena.jpg barn.jpg result6.jpg

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magick composite -dissolve 100 -gravity northeast -geometry +16+0 lena.jpg barn.jpg result7.jpg

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convert barn.jpg lena.jpg -gravity northwest -geometry +16+0 -define compose:args=100,0 -compose dissolve -composite result6a.jpg

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magick barn.jpg lena.jpg -gravity northwest -geometry +16+0 -define compose:args=100,0 -compose dissolve -composite result7a.jpg

[magick]

Try this command:

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composite -dissolve 100 -gravity northeast -geometry +16+0 \
  -define compose:clip-to-self=true lena.jpg barn.jpg result7.jpg

[fmw42]

Try this command:

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composite -dissolve 100 -gravity northeast -geometry +16+0 \
  -define compose:clip-to-self=true lena.jpg barn.jpg result7.jpg

That does not solve the basic issue, especially with convert. If the convert command above works in IM 6 it should work in IM 7. This define was never needed before. Why should one need to add this define, now? None of my images have clip paths.

[magick]

There are differences between IMv6 and IMv7 per the porting guide. However, we do try to replicate IMv6 behavior in IMv7 whenever possible. We have a patch to fix the -dissolve option problem you reported. Until the patch is exported, use the -define as we proposed.

[fmw42]

Thanks. Please note that the define you mentioned is not listed at http://www.imagemagick.org/script/comma ... php#define. What is it supposed to do?

[magick]

See http://www.imagemagick.org/script/comma ... #composite:

Some -compose methods can modify the 'destination' image outside the overlay area. It is disabled by default. You can enable this by setting the special -set 'option:compose:clip-to-self' to 'true'.

[fmw42]

Thanks. I had not noticed that feature before, which is documented at your link.

[magick]

In IMv6, its called compose:outside-overlay.

[fmw42]

Thanks. But there is no -define for that at https://legacy.imagemagick.org/script/c ... php#define

[magick]

Fixed. Give the update a day to mirror.

[BrainwreckedTech]

The problem I originally reported has been fixed in 7.0.8.7.