PNGOUT: Difference between revisions
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'''PNGOUT''' is a free optimizer for [[PNG]] images and is written by [[Ken Silverman]]. The compression is lossless, meaning that the resulting image will have exactly the same appearance as the source image. This program can often get higher compression than other optimizers by 5–10% <ref>[[:Image:Sopwith-screenshot.png]]</ref><ref>[[:Image:DicksonFilm Still.png]]</ref><ref>[[:Image:Neighbours.png]]</ref><ref>[[:Image:Pinball95.png]]</ref>. |
'''PNGOUT''' is a free optimizer for [[PNG]] images and is written by [[Ken Silverman]]. The compression is lossless, meaning that the resulting image will have exactly the same appearance as the source image. This program can often get higher compression than other optimizers by 5–10% <ref>[[:Image:Sopwith-screenshot.png]]</ref><ref>[[:Image:DicksonFilm Still.png]]</ref><ref>[[:Image:Neighbours.png]]</ref><ref>[[:Image:Pinball95.png]]</ref>. |
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In [[2006]], a GUI-driven version of PNGOUT known as ''PNGOUTWin'' was released by [[Ardfry Imaging]], a small company Ken co-founded in [[2005]]. |
In [[2006]], a commercial GUI-driven version of PNGOUT known as ''PNGOUTWin'' was released by [[Ardfry Imaging]], a small company Ken co-founded in [[2005]]. |
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==Main operation== |
==Main operation== |
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Revision as of 01:53, 12 May 2007
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| Original author(s) | Ken Silverman |
|---|---|
| Developer(s) | Ken Silverman |
| Stable release | |
| Operating system | WIN32 Command line interface |
| Type | Image optimizer |
| License | Free |
| Website | Ken Silverman's Utility Page |
PNGOUT is a free optimizer for PNG images and is written by Ken Silverman. The compression is lossless, meaning that the resulting image will have exactly the same appearance as the source image. This program can often get higher compression than other optimizers by 5–10% [1][2][3][4].
In 2006, a commercial GUI-driven version of PNGOUT known as PNGOUTWin was released by Ardfry Imaging, a small company Ken co-founded in 2005.
Main operation
PNGOUT is used mainly to reduce the size of image data contained in the IDAT chunk. This chunk is compressed using the DEFLATE algorithm. Deflate algorithms can vary in their speed and compression ratio. In general, it requires more processing time to achieve higher compression ratio. For PNGOUT, Ken Silverman wrote his own DEFLATE compressor which is slower than the ones used in most graphics software, but leads to smaller files. PNGOUT also performs automatic bit depth, color and palette reduction where appropriate.
Comparable utilities
Other PNG compression programs include:
