PHP Imagick-“量化透明"相等的 [英] PHP Imagick - "-quantize transparent" equivalent

问题描述

是否有与-quantize transparent相对应的PHP Imagick ???

Is there a PHP Imagick equivalent for -quantize transparent ???

-量化透明用法示例注意:在内部使用-透明化"搜索页面

-quantize transparent usage example note: seach for '-quantize transparent' within page

推荐答案

量化受PHP的Imagick扩展支持；但是，几乎没有文件编写.幸运的是，"颜色量化和透明度"中的示例很简单.

Quantize is supported by PHP's Imagick extension; however, little documentation has been authored. Luckily, the example from "Color Quantization and Transparency" is straightforward.

convert alpha_gradient.png -quantize transparent \
    +dither  -colors 15   alpha_colors_15qt.png

从此示例中，我们可以确定Imagick::quantizeImage()所需的5个参数.

From this example, we can determine the 5 arguments needed by Imagick::quantizeImage().

• 颜色数= 15(-颜色15 )
• 颜色空间=透明
• 树深= 0(未定义)
• Dither = False( + dither )
• 测量错误= False

• Number of colors = 15 (-colors 15)
• Colorspace = transparent
• Tree depth = 0 (undefined)
• Dither = False (+dither)
• Messure errors = False

<?php

$wand = new Imagick("alpha_gradient.png");
$wand->quantizeImage(15,Imagick::COLORSPACE_TRANSPARENT,0,false,false);
$wand->writeImage("alpha_colors_15qt.png");

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