(PHP 4, PHP 5, PHP 7)
imagecolordeallocate — De-allocate a color for an image
imagecolordeallocate ( resource $image , int $color ) : bool
De-allocates a color previously allocated with imagecolorallocate() or imagecolorallocatealpha().
image
An image resource, returned by one of the image creation functions, such as imagecreatetruecolor().
color
The color identifier.
Returns true
on success or false
on failure.
Example #1 Using imagecolordeallocate()
<?php $white = imagecolorallocate($im, 255, 255, 255); imagecolordeallocate($im, $white); ?>
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https://www.php.net/manual/en/function.imagecolordeallocate.php