combining qoi with zpaq to get high compression ratio.
It's compression ratio much better than PNG, QOI, QOIR, Wuffs for photographic and non photographic images. Now output of zqoi after decompressing is in PNG format, so just open it. first put qoiconv.exe and zqoi.exe on drive D: and then run d:\zqoi.exe
zqoi v1 input zqoi comp_time decomp_time
$ dice.png 349,827 323,035 0.344s 0.328s
$ grass1.png 2,851,919 2,255,450 1.656s 1.766s
$ IMGP5482_seamless.png 2,649,220 1,489,005 1.203s 1.766s
zqoi v2 zqoi
$ dice.png 273,309
$ grass1.png 2,112,158
$ IMGP5482_seamless.png 1,396,367
qoir, qoi, libpng, wuffs, zpng and another run faster but compression ratio is behind zqoi.
first it compress png file using qoi after that compressed again using zpaq to get smaller files size.
zqoi need libzpaq.h to compress better
Apache 2. See the LICENSE file for details.
Software by surya kandau