Legacy ImageMagick Discussions Archive

IM 6.7.9.0 Q16 Snow Leopard

Is this expected behavior for -coalesce? Without -coalesce I get a meaningful result. With coalesce the result it totally transparent.






convert -size 128x128 xc: logo3.jpg lena2.jpg zelda3.jpg miff:- |\
convert - -delete 0 -evaluate-sequence mean show:

convert -size 128x128 xc: logo3.jpg lena2.jpg zelda3.jpg miff:- |\
convert - -coalesce -delete 0 -evaluate-sequence mean show:

We'll take a look @ the problem. In the mean-time add -alpha off to your command line.

magick wrote:We'll take a look @ the problem. In the mean-time add -alpha off to your command line.

Thanks. I just removed the -coalesce in my script and it works fine. But I wanted to be sure that this is what you expect when using -coalesce.

As you have not set disposals, and all later frames are opaque -coalesce should do nothing. I'd say something is haywire in the low level comparison functions due to alpha changes.

I have no time to look at it though.

anthony wrote:As you have not set disposals, and all later frames are opaque -coalesce should do nothing. I'd say something is haywire in the low level comparison functions due to alpha changes.

I have no time to look at it though.

I believe Magick made a change already.


2012-08-16 6.7.9-1 Cristy <quetzlzacatenango@image...>
...
Don't add matte channel for -coalesce if input images don't have one.