GD and Image Functions
PHP Manual

imagesetpixel

Set a single pixel

Description

bool imagesetpixel(
    GdImage $image,
    int $x,
    int $y,
    int $color
)

imagesetpixel draws a pixel at the specified coordinate.

Parameters

image

A GdImage object, returned by one of the image creation functions, such as imagecreatetruecolor.

x

x-coordinate.

y

y-coordinate.

color

A color identifier created with imagecolorallocate.

Return Values

Returns true on success or false on failure.

Changelog

Version Description
8.0.0 image expects a GdImage instance now; previously, a valid gd resource was expected.

Examples

Example #1 imagesetpixel example

A random drawing that ends with a regular picture. 

<?php

$x = 200;
$y = 200;

$gd = imagecreatetruecolor($x, $y);
 
$corners[0] = array('x' => 100, 'y' =>  10);
$corners[1] = array('x' =>   0, 'y' => 190);
$corners[2] = array('x' => 200, 'y' => 190);

$red = imagecolorallocate($gd, 255, 0, 0); 

for ($i = 0; $i < 100000; $i++) {
  imagesetpixel($gd, round($x), round($y), $red);
  $a = rand(0, 2);
  $x = ($x + $corners[$a]['x']) / 2;
  $y = ($y + $corners[$a]['y']) / 2;
}
 
header('Content-Type: image/png');
imagepng($gd);

?>

The above example will output something similar to:

Output of example : imagesetpixel()

See Also

  • imagecreatetruecolor
  • imagecolorallocate
  • imagecolorat