# pngquant 2 [![build](https://travis-ci.org/kornelski/pngquant.svg?branch=master)](https://travis-ci.org/kornelski/pngquant)
[pngquant](https://pngquant.org) is a PNG compressor that significantly reduces file sizes by converting images to a more efficient 8-bit PNG format *with alpha channel* (often 60-80% smaller than 24/32-bit PNG files). Compressed images are fully standards-compliant and are supported by all web browsers and operating systems.
[This](https://github.com/kornelski/pngquant) is the official `pngquant` repository. The compression engine is also available [as an embeddable library](https://github.com/ImageOptim/libimagequant).
## Usage
- batch conversion of multiple files: `pngquant *.png`
- Unix-style stdin/stdout chaining: `… | pngquant - | …`
To further reduce file size, try [optipng](http://optipng.sourceforge.net), [ImageOptim](https://imageoptim.com), or [zopflipng](https://github.com/google/zopfli).
## Features
* High-quality palette generation
- advanced quantization algorithm with support for gamma correction and premultiplied alpha
- unique dithering algorithm that does not add unnecessary noise to the image
* Configurable quality level
- automatically finds required number of colors and can skip images which can't be converted with the desired quality
* Fast, modern code
- based on a portable [libimagequant library](https://github.com/ImageOptim/libimagequant)
- C99 with no workarounds for legacy systems or compilers ([apart from Visual Studio](https://github.com/kornelski/pngquant/tree/msvc))
- multicore support (via OpenMP) and Intel SSE optimizations
## Options
See `pngquant -h` for full list.
### `--quality min-max`
`min` and `max` are numbers in range 0 (worst) to 100 (perfect), similar to JPEG. pngquant will use the least amount of colors required to meet or exceed the `max` quality. If conversion results in quality below the `min` quality the image won't be saved (if outputting to stdin, 24-bit original will be output) and pngquant will exit with status code 99.
pngquant --quality=65-80 image.png
### `--ext new.png`
Set custom extension (suffix) for output filename. By default `-or8.png` or `-fs8.png` is used. If you use `--ext=.png --force` options pngquant will overwrite input files in place (use with caution).
### `-o out.png` or `--output out.png`
Writes converted file to the given path. When this option is used only single input file is allowed.
### `--skip-if-larger`
Don't write converted files if the conversion isn't worth it.
### `--speed N`
Speed/quality trade-off from 1 (slowest, highest quality, smallest files) to 11 (fastest, less consistent quality, light comperssion). The default is 4. It's recommended to keep the default, unless you need to generate images in real time (e.g. map tiles). Higher speeds are fine with 256 colors, but don't handle lower number of colors well.
### `--nofs`
Disables Floyd-Steinberg dithering.
### `--floyd=0.5`
Controls level of dithering (0 = none, 1 = full). Note that the `=` character is required.
### `--posterize bits`
Reduce precision of the palette by number of bits. Use when the image will be displayed on low-depth screens (e.g. 16-bit displays or compressed textures in ARGB444 format).
### `--strip`
Don't copy optional PNG chunks. Metadata is always removed on Mac (when using Cocoa reader).
See [man page](https://github.com/kornelski/pngquant/blob/master/pngquant.1) (`man pngquant`) for the full list of options.
## License
pngquant is dual-licensed:
* Under **GPL v3** or later with an additional [copyright notice](https://github.com/kornelski/pngquant/blob/master/COPYRIGHT) that must be kept for the older parts of the code.
* Or [a **commercial license**](https://supso.org/projects/pngquant) for use in non-GPL software (e.g. closed-source or App Store distribution). You can [get the license via Super Source](https://supso.org/projects/pngquant). Email kornel@pngquant.org if you have any questions.
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顶级食物链-creator.zip源码cocos creator项目源码下载 (223个子文件)
resultAni.anim 1KB
introUI.anim 987B
menuUI.anim 886B
loadingTxt.anim 769B
earth.anim 409B
Drag PNG here to reduce palette automatically.bat 206B
Drag PNG here to reduce palette to 256.bat 116B
COPYRIGHT 35KB
COPYRIGHT 35KB
index.css 177B
pngquant.exe 754KB
game.fire 81KB
loading.fire 51KB
index.html 1KB
main.js 8KB
file-util.js 2KB
fillEffect.js 1KB
progressBarMoveEffect.js 1KB
index.js 1KB
project.json 1KB
builder.json 1KB
package.json 484B
tsconfig.json 368B
jsconfig.json 266B
builder.panel.json 177B
project.json 169B
services.json 63B
jsconfig.json 2B
LICENSE 1KB
README.md 4KB
README.md 2KB
CHANGELOG.md 221B
items.plist.meta 14KB
圆角矩形 3.png.meta 825B
卡片背景.png.meta 823B
开始按钮.png.meta 816B
返回首页.png.meta 816B
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游戏结束.png.meta 815B
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arrow.png.meta 806B
3.png.meta 805B
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1.png.meta 805B
singleColor.png.meta 803B
AutoAtlas.pac.meta 457B
items.png.meta 288B
Fonts.meta 250B
Script.meta 250B
Texture.meta 250B
Atlas.meta 250B
Prafabs.meta 250B
Ani.meta 250B
Net.meta 250B
UI.meta 250B
Config.meta 250B
menu.meta 250B
land.meta 250B
sea.meta 250B
game.meta 250B
result.meta 250B
info.meta 250B
loading.meta 250B
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