The ImagickPixel::setColorValueQuantum() function is an inbuilt function in PHP which is used to set the value of the provided color channel for a given ImagickPixel’s color. The value can be in a range from 0 to 65535.
Syntax:
bool ImagickPixel::setColorValueQuantum( int $color, float $value )
Parameters:This function accepts two parameters as mentioned above and described below:
- $color: It specifies the 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)
- $value: It specifies the value to be set.
Return Value: This function returns TRUE on success.
Exceptions: This function throws ImagickException on error.
Below given programs illustrate the ImagickPixel::setColorValueQuantum() function in PHP:
Program 1:
<?php // Create a new imagickPixel object $imagickPixel = new ImagickPixel(); // Set the color value $imagickPixel->setColorValueQuantum(imagick::COLOR_BLUE, 4500); // Get the Color value with imagick::COLOR_BLUE $colorValue = $imagickPixel->getColorValueQuantum(imagick::COLOR_BLUE); echo $colorValue; ?> |
Output:
4500
Program 2:
<?php // Create a new imagick object $imagick = new Imagick( // Get the pixel iterator to iterate through each pixel $imageIterator = $imagick->getPixelIterator(); $x = 200; // Loop through pixel rows foreach ($imageIterator as $row => $pixels) { // Loop through the pixels in the row if ($row % 2) { foreach ($pixels as $column => $pixel) { if ($column % 1000) { // Set the color $pixel->setColor("red"); // Set the color value of Imagick::COLOR_RED $pixel->setColorValueQuantum(Imagick::COLOR_RED, $x); $x = $x + 1000; } } } // Sync the iterator after each iteration $imageIterator->syncIterator(); } header("Content-Type: image/jpg"); echo $imagick; ?> |
Output:
Reference: https://www.php.net/manual/en/imagickpixel.setcolorvaluequantum.php
