How to average multiple images into one with ImageMagick?

Question

convert -average darky1.jpg darky2.jpg lighty1.jpg lighty2.jpg l.ppm
convert -average lighty1.jpg lighty2.jpg lighty1.jpg lighty2.jpg d.ppm

l.ppm is much lighter than d.ppm. The order of images matters (but should not).

The same for using evaluate-sequence mean.

How to do it properly?

May be I ask other, more general question there, but here is "how to use this program".

Vi. · Answer 1 · 2010-12-24 16:53:11Z

up vote 0 down vote accepted

Just use GraphicsMagick: gm convert -average *.JPG q.ppm

answered Dec 24 '10 at 16:53

Vi.
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Big disadvantage: it tries to load all input images into memory. /* Alt+SysRq+F */ – Vi. Mar 12 '11 at 23:39

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