In theory that sounds both impressive and useful . . .
But, what, apart from your stack can read the format/compression method
properly.
Also, for the sake of argument: LiveCode can export images in the .PNG,
.JPG, .GIF and the (horribly obscure ?) .PBM formats.
Can your stack export a JPNG image?
And, if, so; what will read it?
AND this:
"This may even result in a larger data size than the original when
decompressing."
doesn't bode well.
Richmond.
On 8/11/17 2:56 am, hh via use-livecode wrote:
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
alphaData,
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
PNG-compressed size.
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:
http://livecodeshare.runrev.com/stack/841/JPNG
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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