In computer programming, Image::Pngslimmer is a Perl module of functions to reduce the size of PNG computer graphics. The module offers several basic functions, including:
zlibshrink – which uses Perl's zlib implementation to attempt to better compress a PNG's IDAT (image data)filter – to apply adaptive filtering to the PNG's IDAT to help improve compressiondiscard_noncritical – to remove non-critical chunks if they existpalettize – to use a colour palette, possibly through colour quantization using the median cut algorithm