ORG.SGF:

ITW

Playing with lossy image compression based on tile prediction and the discrete wavelet transformation

Quick start:

Encode PNM picture file to encoded.itw:

./itwenc smpte.ppm encoded.itw

Decode encoded.itw file to decoded.ppm picture file:

./itwdec encoded.itw decoded.ppm

Watch decoded.ppm picture file in feh:

feh decoded.ppm

Adjusting quantization

Use quantization values instead of the default 128 32 32 values:

./itwenc smpte.ppm encoded.itw 64 32 16

Use different wavelet

Use the reversible integer Haar wavelet instead of the default 0 CDF 9/7 wavelet for lossless compression:

./itwenc smpte.ppm encoded.itw 128 32 32 1