The ImagickPixel::getColorValue() function is an inbuilt function in PHP which is used to get the normalized value of the provided color channel for a given ImagickPixel’s color. The normalized value is a floating-point number between 0 and 1.
Syntax:
float ImagickPixel::getColorValue( int $color )
Parameters:This function accepts a single parameter $color which holds one of COLOR constants.
List of all COLOR constants are given below:
- imagick::COLOR_BLACK (11)
- imagick::COLOR_BLUE (12)
- imagick::COLOR_CYAN (13)
- imagick::COLOR_GREEN (14)
- imagick::COLOR_RED (15)
- imagick::COLOR_YELLOW (16)
- imagick::COLOR_MAGENTA (17)
- imagick::COLOR_OPACITY (18)
- imagick::COLOR_ALPHA (19)
- imagick::COLOR_FUZZ (20)
Return Value: This function returns an float value containing the normalized value of the color value.
Exceptions: This function throws ImagickException on error.
Below given programs illustrate the ImagickPixel::getColorValue() function in PHP:
Program 1:
<?php // Create a new imagickPixel object $imagickPixel = new ImagickPixel('#ad4c45'); // Get the Color value with imagick::COLOR_RED $colorValue = $imagickPixel->getColorValue(imagick::COLOR_RED); echo $colorValue; ?> |
Output:
0.67843137254902
Program 2:
<?php // Create a new imagick object $imagick = new Imagick( // Get the image histogram $histogramElements = $imagick->getImageHistogram(); // Get the 301th pixel $getPixel = $histogramElements[300]; // Get the Color value with imagick::COLOR_GREEN $colorValue = $getPixel->getColorValue(imagick::COLOR_GREEN); echo $colorValue; ?> |
Output:
0.29803921568627
Reference: https://www.php.net/manual/en/imagickpixel.getcolorvalue.php
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