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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?

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Belongs in photo.stackexchange.com ? –  akseli Dec 24 '10 at 3:36
    
May be I ask other, more general question there, but here is "how to use this program". –  Vi. Dec 24 '10 at 13:14
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1 Answer

up vote 1 down vote accepted

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

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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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