ImagickPixel::getColorValue
(PECL imagick 2.0.0)
ImagickPixel::getColorValue — Gets the normalized value of the provided color channel
Description
float ImagickPixel::getColorValue ( int $color )Retrieves the value of the color channel specified, as a floating-point number between 0 and 1.
Parameters
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).
Return Values
The value of the channel, as a normalized floating-point number, throwing ImagickPixelException on error.
Examples
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;
?>The above example will output:
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← ImagickPixel::getColorQuantum
ImagickPixel::getColorValueQuantum →
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