32 lines
1.2 KiB
Plaintext
32 lines
1.2 KiB
Plaintext
pngpack: lossless image compression for a series of screen shots
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Copyright (C) 2005-2010 Carsten Gnoerlich.
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pngpack is a specialized archival format for distributing screen
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shots (which are typically shipped with on-line documentation).
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pngpack provides lossless compression which exploits redundancy
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in a series of images. For example, if you have a collection of
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screen shots which all contain a "Quit" button, the image of the
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"Quit" button is stored once and will then be re-used in all other
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images.
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In a typical scenario, a single image compresses about
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30-40% better than PNG, and a series of 10 similar images
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can save upto 90% of the storage if PNG had been used.
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However, no offense is intended against PNG - PNG is a great
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general purpose format and it is actually used as input and
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output format for pngpack.
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In order to get the best compression out of pngpack,
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use images with a regular structure and very few colors.
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pngpack works best with screen shots of user interfaces
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and simple computer generated charts and slides.
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Avoid including color gradients, background patterns and
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photorealistic backgrounds. For screen shots, do not use
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theming and use a single color for your window and desktop
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background.
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