imagecolorset
(PHP 4, PHP 5, PHP 7)
imagecolorset — Set the color for the specified palette index
Description
imagecolorset ( resource $image , int $index , int $red , int $green , int $blue [, int $alpha = 0 ] ) : void
This sets the specified index in the palette to the specified color. This is useful for creating flood-fill-like effects in palleted images without the overhead of performing the actual flood-fill.
Parameters
-
image -
An image resource, returned by one of the image creation functions, such as imagecreatetruecolor().
-
index -
An index in the palette.
-
red -
Value of red component.
-
green -
Value of green component.
-
blue -
Value of blue component.
-
alpha -
Value of alpha component.
Return Values
No value is returned.
Examples
Example #1 imagecolorset() example
<?php
// Create a 300x100 image
$im = imagecreate(300, 100);
// Set the background to be red
imagecolorallocate($im, 255, 0, 0);
// Get the color index for the background
$bg = imagecolorat($im, 0, 0);
// Set the backgrund to be blue
imagecolorset($im, $bg, 0, 0, 255);
// Output the image to the browser
header('Content-Type: image/png');
imagepng($im);
imagedestroy($im);
?> See Also
- imagecolorat() - Get the index of the color of a pixel
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Licensed under the Creative Commons Attribution License v3.0 or later.
https://www.php.net/manual/en/function.imagecolorset.php