> Hello, > > Does anyone know of a good application to create an MNG-file from a set of > PNG files? > > Imagemagick uses an extremely large amount of memory for this, maybe it > decomresses all the PNGs to RAM at the same time. At any rate, that makes > it unusable for me, given the number of PNG files I have. E.g. with 300 > 640x480 PNG files imagemagick uses over 600MB to create an MNG. In > addition, I cannot play it with the "animate" commmand, since that uses > above 900MB, and the process is then automatically killed on my computer > (1GB RAM). I can, however, display it with the "showimg" package. I want to > do this with much more than 300 images, so imagemagick cannot be used for > this on my computer. > > I tried the "advancecomp" package, but that didn't work on my PNGs, which > are created with PLplot. I was very hopeful about this program, because it > supports a fancy MNG mode where only differences between frames are encoded > (I have an animated plot with lots of constant parts). > > I have not been able to find out if GIMP can create an MNG from set of > PNG-files through the Gimp Animation Plugin. > > Any ideas?
I managed to make FLC animations which were very good, but they were a bit large. Then I found that if I use the 8bit PNG option in PLplot, I can use the advancecomp tools, i.e. advmng, to generate an MNG file. I don't need more colours, so I am quite happy with that. This file is much smaller, since MNG has good compression and it also only updates the differences between consecutive frames. Example: 74 frames of 640x480 8bit PNGs from my simulation (some polygons moving around in a mostly black page with a box around and som text here and there): FLC: 1.1MB and MNG: 360KB. Best regards, Torquil Sørensen