PHP GD image grayscale
This example shows how to display that the particular image is grayscale or not in php gd.
This example shows how to display that the particular image is grayscale or not in php gd.<?php
$source_file = "images.jpg";
$im = ImageCreateFromJpeg($source_file);
$imgw = imagesx($im);
$imgh = imagesy($im);
$r = array();
$g = array();
$b = array();
$c = 0;
for ($i=0; $i<$imgw; $i++)
{
for ($j=0; $j<$imgh; $j++)
{
$rgb = ImageColorAt($im, $i, $j);
$r[$i][$j] = ($rgb >> 16) & 0xFF;
$g[$i][$j] = ($rgb >> 8) & 0xFF;
$b[$i][$j] = $rgb & 0xFF;
if ($r[$i][$j] == $g[$i][$j] && $r[$i][$j] == $b[$i][$j])
{
$c++;
}
}
}
if ($c == ($imgw*$imgh))
{
echo "The image is grayscale.";
}
else
{
echo "The image is NOT grayscale.";
}
?>
After running the program you will get the following output
OUTPUT:The image is NOT grayscale
