The Imagick::sparseColorImage() function is an inbuilt function in PHP which is used to interpolate the colors across the whole image.
Syntax:
bool Imagick::sparseColorImage( int $SPARSE_METHOD, array $arguments, int $channel )
Parameters: This function accepts three parameters as mentioned above and described below:
- $SPARSE_METHOD: It specifies an integer corresponding to one of SPARSECOLORMETHOD constants. List of SPARSECOLORMETHOD constants are given below:
- imagick::SPARSECOLORMETHOD_UNDEFINED (0)
- imagick::SPARSECOLORMETHOD_BARYCENTRIC (1)
- imagick::SPARSECOLORMETHOD_BILINEAR (7)
- imagick::SPARSECOLORMETHOD_POLYNOMIAL (8)
- imagick::SPARSECOLORMETHOD_SPEPARDS (16)
- imagick::SPARSECOLORMETHOD_VORONOI (18)
- $arguments: It specifies the coordinates.
- $channel (Optional): It specifies any channel constant that is valid for your channel mode. To apply more than one channel, combine channel constants using bit-wise operators. Its default value is Imagick::CHANNEL_DEFAULT.
Return Value: This function returns TRUE on success.
Below programs illustrate the Imagick::sparseColorImage() function in PHP:
Program 1:
<?php   // Create a new imagick object $imagick = new Imagick(   $array = array(0, 0, 1, 0, 0, 1, 900, 0, 0, 1,                0, 1, 0, 1, 100, 1, 0, 70, 400,                90, 0, 0, 1, 1);   // Apply the sparseColorImage() function $imagick->sparseColorImage(imagick::SPARSECOLORMETHOD_BILINEAR, $array);   // Show the output header("Content-Type: image/png"); echo $imagick->getImageBlob(); ?> |
Output:
Program 2:
<?php   // Create a new imagick object $imagick = new Imagick(   $array = array(0, 0, 1, 0, 0, 1, 78, 0, 0, 1,                0, 1, 0, 1, 10, 1, 0, 20, 400,                90, 0, 0, 1, 1);   // Apply the sparseColorImage() function $imagick->sparseColorImage(imagick::SPARSECOLORMETHOD_BARYCENTRIC, $array);   // Show the output header("Content-Type: image/png"); echo $imagick->getImageBlob(); ?> |
Output:
Reference: https://www.php.net/manual/en/imagick.sparsecolorimage.php
