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Example

Set color value

← setColorFromPixel   setColorValueQuantum →
Sets the value of the specified channel of this object to the provided value, which should be between 0 and 1. This function can be used to provide an opacity channel to an ImagickPixel object.
// Example 1
function setColorValue()
{
    $image = new \Imagick();
    $draw = new \ImagickDraw();

    $color = new \ImagickPixel('blue');
    $color->setcolorValue(\Imagick::COLOR_RED, 128);

    $draw->setstrokewidth(1.0);
    $draw->setStrokeColor($color);
    $draw->setFillColor($color);
    $draw->rectangle(200, 200, 300, 300);

    $image->newImage(500, 500, "SteelBlue2");
    $image->setImageFormat("png");
    $image->drawImage($draw);

    header("Content-Type: image/png");
    echo $image->getImageBlob();
}
// Example 2 - Quantum
function setColorValueQuantum()
{
    $image = new \Imagick();

    $quantumRange = $image->getQuantumRange();

    $draw = new \ImagickDraw();
    $color = new \ImagickPixel('blue');
    $color->setcolorValueQuantum(\Imagick::COLOR_RED, 128 * $quantumRange['quantumRangeLong'] / 256);

    $draw->setstrokewidth(1.0);
    $draw->setStrokeColor($color);
    $draw->setFillColor($color);
    $draw->rectangle(200, 200, 300, 300);

    $image->newImage(500, 500, "SteelBlue2");
    $image->setImageFormat("png");

    $image->drawImage($draw);

    header("Content-Type: image/png");
    echo $image->getImageBlob();
}