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。

示例

示例 #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();
}

?>

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josecarlosphp ¶

8 months ago

The $color parameter can be a string like this:

"rgb(255, 255, 255)"

As you can guess, that example represents white color.
"rgb" indicates red-green-blue, and numeric values are amounts for each, from 0 to 255.

Black color it will be "rgb(0, 0, 0)".
Full red color it will be "rgb(255, 0, 0)".