PHP Imagick - “-quantize transparent” equivalent

问题

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

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

回答1:

Qunatize 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

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

• 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");

来源：https://stackoverflow.com/questions/13327675/php-imagick-quantize-transparent-equivalent