Image-PNG
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lib/Image/PNG.pod view on Meta::CPAN
users whether this works or not on various platforms.
=item Image::PNG::Rewriter
L<Image::PNG::Rewriter> is a utility for unpacking and recompressing
the IDAT (image data) part of a PNG image. The main purpose seems to
be to recompress the image data with the module author's other module
L<Compress::Deflate7>. Unfortunately that only works with Perl
versions 5.12.
=item Image::Pngslimmer
L<Image::Pngslimmer> reduces the size of dynamically created PNG
images. It's very, very slow at reading PNG data, but seems to work
OK.
=item Image::Info
L<Image::Info> is a module for getting information out of various
types of images. It has good support for PNG and is written in pure
Perl (doesn't require a C compiler). As well as basics such as height,
width, and colour type, it can get text chunks, modification time,
palette, gamma (gAMA chunk), resolution (pHYs chunk), and significant
( run in 0.634 second using v1.01-cache-2.11-cpan-0a6323c29d9 )