imagecolorset
(PHP 4, PHP 5, PHP 7)
imagecolorset — Set the color for the specified palette index
Description
void imagecolorset ( resource $image , int $index , int $red , int $green , int $blue [, int $alpha = 0 ] )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.
Changelog
Version | Description |
|---|---|
5.4.0 | The alpha parameter was added. |
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
← imagecolorresolvealpha
imagecolorsforindex →
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