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 // 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 // Create a new gmagickPixel object $imagickPixel = new GmagickPixel();
// Create a new Gmagick object $gmagick = new Gmagick( 'geeksforgeeks.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, 'GeeksforGeeks' );
// 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