ect
lossless image compression optimizer
TLDR
SYNOPSIS
ect [options] files...
DESCRIPTION
ECT (Efficient Compression Tool) losslessly optimizes PNG, JPEG, and gzip files for smaller sizes. It achieves better compression than many alternatives while remaining lossless.The tool combines multiple compression strategies to reduce file sizes without quality loss. For PNG, it optimizes filters and DEFLATE compression. For JPEG, it optimizes Huffman tables.ECT is useful for web optimization, reducing bandwidth and storage while maintaining perfect image quality.
PARAMETERS
FILES
Image files to optimize.-1 to -9
Compression level (1 = fast, 9 = slowest/strongest). Default is -3.-recurse
Process directories recursively.-keep
Preserve file modification time.-strip
Strip metadata (EXIF, comments, color profiles).-progressive
Encode JPEGs as progressive.-gzip
Optimize gzip files instead of treating them as images.-zip
Optimize ZIP archives.-quiet
Suppress non-error output.--mt-deflate[=N]
Multithread the deflate stage; optionally pin to N threads.--mt-file[=N]
Process multiple input files in parallel.-help
Display help information.
INSTALL
CAVEATS
High compression levels are very slow (level 9 may take minutes per image). Files are rewritten in place. Use -strip if you need the absolute smallest output, since metadata is kept by default.
HISTORY
ECT was developed as a high-performance lossless image optimizer, combining techniques from multiple compression tools (zopfli, optipng, etc.) into an efficient single tool.
