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PHP | imagetruecolortopalette() Function
  • Last Updated : 26 Aug, 2019

The imagetruecolortopalette() function is an inbuilt function in PHP which is used to convert a true color image to a palette image.

Syntax:

bool imagetruecolortopalette( $image, $dither, $ncolors )

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

  • $image: It is returned by one of the image creation functions, such as imagecreatetruecolor(). It is used to create size of image.
  • $dither: It is the boolean value which indicate the image is dither. If it is True then dithering will be used which will result in a more speckled image but with better color approximation.
  • $ncolors: This parameter contains the set of maximum number of colors that should be retained in the palette.

Return Value: This function returns True on success or False on failure.

Below programs illustrates the imagetruecolortopalette() function in PHP:



Program 1:




<?php
  
// Create a 400*300 image
$im = imagecreatetruecolor(400, 300);
  
// Set the background color of image 
$background_color = imagecolorallocate($im,  0, 153, 0); 
       
// Fill background with above selected color 
imagefill($im, 0, 0, $background_color); 
  
// Convert to palette-based with no dithering and 255 colors
imagetruecolortopalette($im, true, 255);
  
// Output the picture to the browser 
header('Content-type: image/png'); 
       
imagepng($im); 
?>


Output:

Program 2:




<?php
  
// Setup the true color and palette images 
$im = imagecreatefrompng( 
  
// Convert to palette-based with no dithering and 255 colors
imagetruecolortopalette($im, false, 255);
  
// Output the picture to the browser 
header('Content-type: image/png'); 
       
imagepng($im); 
?>


Output:

Reference: http://php.net/manual/en/function.imagetruecolortopalette.php

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