diff options
author | Martin Wilke <miwi@FreeBSD.org> | 2012-04-21 18:48:11 +0000 |
---|---|---|
committer | Martin Wilke <miwi@FreeBSD.org> | 2012-04-21 18:48:11 +0000 |
commit | 9dcf4bcaca13a5ebc0114388de603d00ccaadd0b (patch) | |
tree | 60119b12267d8c28fc8a1115a883896bbccbf1c3 /graphics/pngquant/pkg-descr | |
parent | 762365343771fae3a93e0fb6a9932f5e918722a9 (diff) | |
download | ports-9dcf4bcaca13a5ebc0114388de603d00ccaadd0b.tar.gz ports-9dcf4bcaca13a5ebc0114388de603d00ccaadd0b.zip |
Notes
Diffstat (limited to 'graphics/pngquant/pkg-descr')
-rw-r--r-- | graphics/pngquant/pkg-descr | 39 |
1 files changed, 16 insertions, 23 deletions
diff --git a/graphics/pngquant/pkg-descr b/graphics/pngquant/pkg-descr index cace7fb63c4c..b4f6da610b49 100644 --- a/graphics/pngquant/pkg-descr +++ b/graphics/pngquant/pkg-descr @@ -1,24 +1,17 @@ -The pngquant utility converts 32-bit RGBA PNGs to 8-bit RGBA-palette PNGs (or -fewer than 8 bits, if you want), via quantization and ordered or diffusion -(Floyd-Steinberg) dithering. You can also use it on RGB or even palette images -(for example, to further color-reduce them to 16 colors). It does: - - nice reduction of all PNG image types to 256-color (or smaller) palette - - automatic optimization of tRNS chunks - - batch conversion of multiple files (e.g., "pngquant 256 *.png") - - Unix-style command-line filtering (e.g., "... | pngquant 16 | ...") -It does still lack a few features: - - no ancillary chunk preservation (except gAMA) - - no preservation of significant-bits info after rescaling (sBIT chunk) - - no mapfile support - - no "native" handling of 16-bit-per-sample files or gray+alpha files - (all samples are truncated to 8 bits and all images are promoted - to RGBA before quantization) -By the way, be sure to check "before" and "after" file sizes, preferably with -pngcrush (http://pmt.sourceforge.net/pngcrush/); dithered palette images may -be four times smaller to begin with, but they do not compress nearly as well -as grayscale and truecolor images. Some images, such as Henri Sivonen's alpha -button (http://www.pp.htv.fi/hsivone1/css-test/bitmapstyle.html), can be made -smaller as full 32-bit RGBA images (4076 bytes in this case) than as either -FS-dithered palette (4550 bytes) or ordered-dither palette (4482 bytes) images. +pngquant is a command-line utility to quantize and dither 32-bit RGBA +PNGs down to 8-bit (or smaller) RGBA-palette PNGs, usually with a +significant reduction in file size (40-70% smaller than 24-bit PNGs). -WWW: http://www.libpng.org/pub/png/apps/pngquant.html +This unique type of PNG supports full alpha transparency and is +compatible with all modern web browsers, and has better fallback in IE6 +than 24-bit PNGs. + +Features: + - High-quality palette generation using modernized Median Cut + algorithm. + - Unique dithering algorithm that adds less noise to images than the + standard Floyd-Steinberg. + - Easy to integrate with shell scripts, GUIs and server-side software. + - Fast mode for processing large numbers of images. + +WWW: http://pngquant.org/ |