PHP | Gmagick cyclecolormapimage() Function

The Gmagick::cyclecolormapimage() function is an inbuilt function in PHP which is used to displace an image colormap by a given number of positions. If you cycle the colormap a number of times you can produce a psychedelic effect.

Syntax:

Gmagick Gmagick::cyclecolormapimage( int $displace )

Parameters: This function accepts a single parameter $displace which holds the the displacement.

Return Value: This function returns Gmagick object on success.

Exceptions: This function throws GmagickException on error.



Below given programs illustrate the Gmagick::cyclecolormapimage() function in PHP:

Used Image:

Program 1:

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<?php
  
// Create a new Gmagick object
$gmagick = new Gmagick('geeksforgeeks.png');
  
// Apply the cyclecolormapimage() function
$gmagick->cyclecolormapimage(2); 
  
// Output the image to browser
header('Content-type: image/png');  
echo $gmagick;  
?>  

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Output:

Program 2:

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<?php
  
// Create a new Gmagick object
$gmagick = new Gmagick('geeksforgeeks.png');
  
// Create a GmagickDraw object
$draw = new GmagickDraw();
  
// Set the color
$draw->setFillColor('white');
  
// Function to draw rectangle
$draw->rectangle(0, 0, 800, 400);
  
// Set the fill color
$draw->setFillColor('red');
  
// Set the font size
$draw->setfontsize(50);
  
// Annotate a text
$draw->annotate(30, 100, 'GeeksforGeeks');
  
// Use of drawimage function
$gmagick->drawImage($draw);
  
// Apply the cyclecolormapimage() function
$gmagick->cyclecolormapimage(1); 
  
// Display the output image
header("Content-Type: image/png");
echo $gmagick->getImageBlob();
?>

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Output:

Reference: https://www.php.net/manual/en/gmagick.cyclecolormapimage.php




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