ImagickPixel::getColorValue
(PECL imagick 2, PECL imagick 3)
ImagickPixel::getColorValue — Gets the normalized value of the provided color channel
Beschreibung
public ImagickPixel::getColorValue(int
$color): floatRetrieves the value of the color channel specified, as a floating-point number between 0 and 1.
Parameter-Liste
-
color -
The color to get the value of, specified as one of the Imagick color constants. This can be one of the RGB colors, CMYK colors, alpha and opacity e.g (Imagick::COLOR_BLUE, Imagick::COLOR_MAGENTA).
Rückgabewerte
The value of the channel, as a normalized floating-point number, throwing ImagickPixelException on error.
Beispiele
Beispiel #1 Basic Imagick::getColorValue() usage
<?php
$color = new ImagickPixel('rgba(90%, 20%, 20%, 0.75)');
echo "Alpha value is ".$color->getColorValue(Imagick::COLOR_ALPHA).PHP_EOL;
echo "".PHP_EOL;
echo "Red value is ".$color->getColorValue(Imagick::COLOR_RED).PHP_EOL;
echo "Green value is ".$color->getColorValue(Imagick::COLOR_GREEN).PHP_EOL;
echo "Blue value is ".$color->getColorValue(Imagick::COLOR_BLUE).PHP_EOL;
echo "".PHP_EOL;
echo "Cyan value is ".$color->getColorValue(Imagick::COLOR_CYAN).PHP_EOL;
echo "Magenta value is ".$color->getColorValue(Imagick::COLOR_MAGENTA).PHP_EOL;
echo "Yellow value is ".$color->getColorValue(Imagick::COLOR_YELLOW).PHP_EOL;
echo "Black value is ".$color->getColorValue(Imagick::COLOR_BLACK).PHP_EOL;
?>
Das oben gezeigte Beispiel erzeugt folgende Ausgabe:
Alpha value is 0.74999618524453 Red value is 0.90000762951095 Green value is 0.2 Blue value is 0.2 Cyan value is 0.90000762951095 Magenta value is 0.2 Yellow value is 0.2 Black value is 0
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