PHP | GmagickPixel setcolorvalue() Function

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The GmagickPixel::setcolorvalue() function is an inbuilt function in PHP which is used to set the normalized value of the provided color channel for a given GmagickPixel’s color. The normalized value is a floating-point number between 0 and 1.
Syntax:

GmagickPixel GmagickPixel::setcolorvalue( int $color, float $value )

Parameters: This function accepts two parameters as mentioned above and described below:

$color: It specifies an integer which corresponds to 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)
$value: It specifies the value.

Return Value: This function returns GmagickPixel object on success.
Exceptions: This function throws GmagickPixelException on error.
Below given programs illustrate the GmagickPixel::setcolorvalue() function in PHP:
Program 1:

php

<?php 
// Create a new gmagickPixel object 
$imagickPixel = new GmagickPixel(); 
  
// Set the color value 
$imagickPixel->setColorValue(gmagick::COLOR_RED, 0.8); 
  
// Get the Color value with gmagick::COLOR_RED 
$colorValue = $imagickPixel->getcolorvalue(gmagick::COLOR_RED); 
echo $colorValue; 
?> 

Output:

0.8

Used Image:

Program 2:

php

<?php 
  
// Create a new gmagickPixel object 
$imagickPixel = new GmagickPixel(); 
  
// Create a new Gmagick object 
$gmagick = new Gmagick('zambiatek.png'); 
   
// Create a new GmagickPixel object 
$gmagickPixel = new GmagickPixel(); 
   
// Set the color to red 
$gmagickPixel->setcolor('red'); 
  
// Set the color value of red to 0.5 for light red 
$gmagickPixel->setcolorvalue(gmagick::COLOR_RED, 0.5); 
   
// Create a GmagickDraw object 
$draw = new GmagickDraw(); 
   
// Set fill color using gmagickpixel 
$draw->setfillcolor($gmagickPixel); 
   
// Set the font size 
$draw->setfontsize(40); 
    
// Annotate a text 
$draw->annotate(180, 180, 'zambiatek'); 
    
// Use of drawimage function 
$gmagick->drawImage($draw); 
    
// Display the output image 
header("Content-Type: image/png"); 
echo $gmagick->getImageBlob(); 
?> 

Output:

Reference: https://www.php.net/manual/en/gmagickpixel.setcolorvalue.php

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