Generate pixels from image template in php not working :( - php

Question

I tried this code to generate pixels around a black and white template, but it only gives me scrambled machine code.
Can anyone tell my how to fix it, or why exactly this happens?
https://nowat.org/test44.php
<?php
// Load the image of Nelson Mandela
$original = imagecreatefromjpeg('https://www.bigissue.org.za/wp-content/uploads/2016/07/Nelson-Mandela_AFP-Photo-2.jpg');
// Get the dimensions of the original image
$width = imagesx($original);
$height = imagesy($original);
// Create a blank image with the same dimensions
$image = imagecreatetruecolor($width, $height);
// Generate random pixels
for ($x = 0; $x < $width; $x++) {
for ($y = 0; $y < $height; $y++) {
// Get the color of the current pixel from the original image
$rgb = imagecolorat($original, $x, $y);
$colors = imagecolorsforindex($original, $rgb);
// Generate a random color variation
$red = rand($colors['red'] - 50, $colors['red'] + 50);
$green = rand($colors['green'] - 50, $colors['green'] + 50);
$blue = rand($colors['blue'] - 50, $colors['blue'] + 50);
$color = imagecolorallocate($image, $red, $green, $blue);
// Set the pixel color
imagesetpixel($image, $x, $y, $color);
}
}
// Output the image as a PNG
header('Content-Type: image/png');
imagepng($image);
// Clean up
imagedestroy($image);
?>
Any Help appreciated!

Answer 1

Your random color are not correct. Color must be between 0 and 255.
...
var_dump($red, $blue, $green);
...
int(261) <--- HERE
PHP Fatal error: Uncaught ValueError: imagecolorallocate(): Argument #2 ($red) must be between 0 and 255 (inclusive) in test.php:24
Stack trace:
#0 test.php(24): imagecolorallocate()
#1 {main}
thrown in test.php on line 24
Try this:
$red = abs(rand($colors['red'] - 50, $colors['red'] + 50) % 255);
$green = abs(rand($colors['green'] - 50, $colors['green'] + 50) % 255);
$blue = abs(rand($colors['blue'] - 50, $colors['blue'] + 50) % 255);
Result here