Php/docs/imagick.transparentpaintimage

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• Imagick
• Paints pixels transparent

Imagick::transparentPaintImage

(PECL imagick 2 >= 2.3.0, PECL imagick 3)

Imagick::transparentPaintImage — Paints pixels transparent

说明

public 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()

<?phpfunction 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();}?>