<?php
/* show image */
echo "<img src='https://i.imgur.com/dSPQrMN.jpg' style='height:200px; width:auto;'><br>";
/* create an image resource based on an existing image file */
/* use the imagecreatefrompng function for a png image */
$img = imagecreatefromjpeg('https://i.imgur.com/dSPQrMN.jpg');
/* get the image resource width and height (resolution) */
$width = imagesx($img);
$height = imagesy($img);
$npixels = $width * $height;
/* loop through every pixel of the image */
$r=0; $g=0; $b=0;
for ($col = 0; $col <= $width; $col++) {
for ($row = 0; $row <= $height; $row++) {
$colourn = imagecolorat($img, $col, $row); //gets the pixel colour as an integer
/* get the number of red, green and blue pixels using bitwise operators */
$red = (($colourn >> 16) & 255);
$green = (($colourn >> 8) & 255);
$blue = ($colourn & 255);
if ($red > $green && $red > $blue) {$r = $r + 1;} else
if ($green > $red && $green > $blue) {$g = $g + 1;} else
if ($blue > $green && $blue > $red) $b = $b + 1;
}
}
/* get the percentages of each primary colour formatted one decimal */
$rp = $r * 100 / $npixels; $rp = number_format($rp,1);
$gp = $g * 100 / $npixels; $gp = number_format($gp,1);
$bp = $b * 100 / $npixels; $bp = number_format($bp,1);
/* the report */
echo "<div>Resolution: $width x $height pixels</div>";
echo "<div>Total number of pixels = $npixels</div>";
echo "<div>Red pixels: $r ($rp%)<br>Green pixels: $g ($gp%)<br>Blue pixels: $b ($bp%)</div>";
?>
