Imagick::transparentPaintImage()
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Paints pixels transparent
说明
Imagick::transparentPaintImage(mixed $target,float $alpha,float $fuzz,bool $invert): bool
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。
参数
- $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.
- $invert
If
TRUE
paints any pixel that does not match the target color.
返回值
成功时返回TRUE
。
范例
Example #1 Imagick::transparentPaintImage()
<?php function transparentPaintImage($color, $alpha, $fuzz) { $imagick = new \Imagick(realpath("images/BlueScreen.jpg")); //Need to be in a format that supports transparency $imagick->setimageformat('png'); $imagick->transparentPaintImage( $color, $alpha, $fuzz * \Imagick::getQuantum(), false ); //Not required, but helps tidy up left over pixels $imagick->despeckleimage(); header("Content-Type: image/png"); echo $imagick->getImageBlob(); } ?>