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The correct title of this article is Image::Pngslimmer. The substitution or omission of the colon is because of technical restrictions.
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 compression
discard_noncritical – to remove non-critical chunks if they exist
palettize – to use a colour palette, possibly through colour quantization using the median cut algorithm