JPNG (named using JPEG and PNG) is not an image format but a compression method.
We use the file ending ".lcjpng" for that.
It takes features from both JPEG (setting JPEGquality to compress the imageData
and from the PNG compression the alphaData/transparency). It saves the
optionally the maskData, and the JPEG-compressed imageData in one file. The
JPNG-compressed image has here, using a JPEGquality of 80, around 25% of the
So this may be interesting for people who wish to compress (significantly in
size) the PNG-images containing transparency in their stack/standalone and
decompress only some images for "current" use.
Compression/Decompression is very fast.
See stack "JPNG" via the "Sample stacks" of the LC toolbar or (slower) here:
This sample stack compresses to files or to (numbered) custom properties.
Note: I don't use the JPNG data structure of js or objC, but you can easily
convert it to that.
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