PHP | Imagick segmentImage() Function

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The Imagick::segmentImage() function is an inbuilt function in PHP which is used to segment an image.

Syntax:

bool Imagick::segmentImage(int $COLORSPACE, 
float $cluster_threshold, float $smooth_threshold, 
bool $verbose = FALSE )

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

$COLORSPACE: It specifies the integer value corresponding to one of COLORSPACE constants. You can also pass direct constants like imagick::COLORSPACE_RGB.
$cluster_threshold: It specifies a percentage describing minimum number of pixels contained in hexedra before it is considered valid.
$smooth_threshold: It specifies whether to eliminate noise from the histogram.
$verbose (Optional): It specifies whether to output detailed information about recognized classes. Default value is false

List of all COLORSPACE constants are given below:

imagick::COLORSPACE_UNDEFINED (0)
imagick::COLORSPACE_RGB (1)
imagick::COLORSPACE_GRAY (2)
imagick::COLORSPACE_TRANSPARENT (3)
imagick::COLORSPACE_OHTA (4)
imagick::COLORSPACE_LAB (5)
imagick::COLORSPACE_XYZ (6)
imagick::COLORSPACE_YCBCR (7)
imagick::COLORSPACE_YCC (8)
imagick::COLORSPACE_YIQ (9)
imagick::COLORSPACE_YPBPR (10)
imagick::COLORSPACE_YUV (11)
imagick::COLORSPACE_CMYK (12)
imagick::COLORSPACE_SRGB (13)
imagick::COLORSPACE_HSB (14)
imagick::COLORSPACE_HSL (15)
imagick::COLORSPACE_HWB (16)
imagick::COLORSPACE_REC601LUMA (17)
imagick::COLORSPACE_REC709LUMA (19)
imagick::COLORSPACE_LOG (21)
imagick::COLORSPACE_CMY (22)

Return Value: This function returns TRUE on success.

Exceptions: This function throws ImagickException on error.

Below given programs illustrate the Imagick::segmentImage() function in PHP:

Program 1:

<?php 
  
// Create a new imagick object 
$imagick = new Imagick( 
'https://media.zambiatek.com/wp-content/uploads/zambiatek-13.png'); 
  
// Segment the image with colorspace as imagick::COLORSPACE_RGB 
$imagick->segmentImage(1, 0, 12); 
  
// Display the image 
header("Content-Type: image/png"); 
echo $imagick->getImageBlob(); 
?> 

Output:

Program 2:

<?php 
  
// Create a new imagick object 
$imagick = new Imagick( 
'https://media.zambiatek.com/wp-content/uploads/zambiatek-13.png'); 
  
// Segment the image with colorspace as imagick::COLORSPACE_GRAY 
$imagick->segmentImage(2, 5, 30); 
  
// Display the image 
header("Content-Type: image/png"); 
echo $imagick->getImageBlob(); 
?> 

Output:

Reference: https://www.php.net/manual/en/imagick.segmentimage.php

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