ImagickPixel::getColorValue

(PECL imagick 2.0.0)

ImagickPixel::getColorValue — Gets the normalized value of the provided color channel

Descrierea

float ImagickPixel::getColorValue ( int $color )

Retrieves the value of the color channel specified, as a floating-point number between 0 and 1.

Parametri

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).

Valorile întoarse

The value of the channel, as a normalized floating-point number, throwing ImagickPixelException on error.

Exemple

Example #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;

?>

Exemplul de mai sus va afișa:

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