Legacy ImageMagick Discussions Archive

That works!

correctly superimposes the 5 partial superimpositions into one.


Thank you very much

Hm, well for

convert *.png +level 99%,100% \
-compose linear_burn -background white -flatten \
shadow_merge_result.png

it doesn't seem to work to process say 5 groups of 20 images separately and then process the 5 results into one result. Processing 20 to 1 resultimage works fine, but processing ...

Okay, thanks, I can process them in groups of 10 or the like. I'm on Linux

Thanks, how does one write such a loop, for example, with the following command

convert *.png +level 99%,100% \
-compose linear_burn -background white -flatten \
shadow_merge_result.png

?

Ok now I have made tests on my work computer on all 100 images with

convert *.png +level 99%,100% \
-compose linear_burn -background white -flatten \
shadow_merge_result.png

but the images might be too large, 3000x5000 pixels each, for the computer runs out of memory. If 16 GB RAM + 5 GB swap is ...

P.S.
The images are 8 bit grayscale, but each image is "thresholded" to black and white. Their superimposition, however, will create areas of gray depending on amount of overlaps in those areas (if each image is set to 1% opacity).

Later I should also try

convert *.png +level 70%,100 ...

Thanks very much for your comments :)

I tried

convert *.png +level 99%,100% \
-compose linear_burn -background white -flatten \
shadow_merge_result.png

on a test batch of 10 images, and it seems it produced the desired result, and quite fast as well, which made me happy. However, when I tried ...

The batch of images are black and white and depict the shadow-shapes cast by a group of buildings: one shadow every 6th minute, from 8 am to 6 pm, which means 100 images of shadows, each slightly different from the other because of the rotation of the earth. Now if I superimpose them in such a way ...

Thanks now I can also darken images to resultimage. However, I need to darken and blend to resultimage. Is it possible?

Hello :)

I'm trying to superimpose a batch of hundred black and white images so that they blend with 1% opacity and "darken only". The multiplicity of the black parts should become visible without being covered by the white parts. Previously I have opened each and every image in Gimp, pasted them ...