SAMSAM where is the useful information in your post.
Do you think that reading a pixel color have nothing to do inside an console image soft.
Thanks you cday for your true help!
I'm there to completely trow away this "junk" soft of ImageMagick that I already use to do this pixel color reading.
I say that about this soft because no way to get a true lossless jpeg to png convert with it, so without any pixel change...
NConvert have successful done this convert at my first try! and the bytes are identical to well know GUI soft.
So well done Pierre
I was just looking to only use NConvert instead of a mix of soft, and IM seems very bad on the noise that it create... (and maybe little slow too)
So I suggest to add this pixel color reading basic feature inside the next version, it seems an easy job for Pierre.
And for a better challenge, that we can read many pixels color at once, to avoid the slowing down produced by each same image decompression when doing one by one pixel, and so maybe with a max possible request of for example 16 pixels x/y at once.
Very thanks Pierre for your great soft anyway