Imagick::transparentPaintImage

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Imagick::transparentPaintImage — Paints pixels transparent

bool Imagick::transparentPaintImage ( mixed $target , float $alpha , float $fuzz , bool $invert )

Paints pixels matching the target color transparent. 此方法在Imagick基于ImageMagick 6.3.8以上版本编译时可用。

target: The target color to paint
alpha: 透明级别：1.0 是完全不透明，0.0 是完全透明。
fuzz: The amount of fuzz. For example, set fuzz to 10 and the color red at intensities of 100 and 102 respectively are now interpreted as the same color.
invert: If TRUE paints any pixel that does not match the target color.

成功时返回 TRUE。