how to count number of pixels in image (php)

Question

Please help me to count number of pixels in image, or put out the array of RGB.

So this is the script thet give me one element from array:

<?php
    $img = "1.png";
    $imgHand = imagecreatefrompng("$img");
    $imgSize = GetImageSize($img);
    $imgWidth = $imgSize[0];
    $imgHeight = $imgSize[1];
    echo '<img src="'.$img.'"><br><br>';
    for ($l = 0; $l < $imgHeight; $l++) {
        for ($c = 0; $c < $imgWidth; $c++) {
            $pxlCor = ImageColorAt($imgHand,$c,$l);
            $pxlCorArr = ImageColorsForIndex($imgHand, $pxlCor);
        }
    }


        print_r($pxlCorArr); 
?>

sorry for my english i from ukraine

what exactly are you trying to do? total number of pixels in image as in imgwidth x imageheight or what? — Maxim VA, Oct 28 '12 at 23:16
I believe he wants a `$pxlCorArr` of the entire image, where the index is the pixel, and the value the colour .. else nothing of his code would make sense. — dbf, Oct 28 '12 at 23:17
i trying to put all pixels in array and then put out RGB code — Bob Dylan, Oct 28 '12 at 23:18

sachleen · Accepted Answer · 2012-10-28T23:27:24.087

The number of pixels in an image is simply the height multiplied by the width.

However, I think this is what you want:

<?php
    $img = "1.png";
    $imgHand = imagecreatefrompng("$img");
    $imgSize = GetImageSize($img);
    $imgWidth = $imgSize[0];
    $imgHeight = $imgSize[1];
    echo '<img src="'.$img.'"><br><br>';

    // Define a new array to store the info
    $pxlCorArr= array();

    for ($l = 0; $l < $imgHeight; $l++) {
        // Start a new "row" in the array for each row of the image.
        $pxlCorArr[$l] = array();

        for ($c = 0; $c < $imgWidth; $c++) {
            $pxlCor = ImageColorAt($imgHand,$c,$l);

            // Put each pixel's info in the array
            $pxlCorArr[$l][$c] = ImageColorsForIndex($imgHand, $pxlCor);
        }
    }

    print_r($pxlCorArr); 
?>

This will store all the pixel data for the image in the pxlCor and pxlCorArr arrays, which you can then manipulate to output what you want.

The array is a 2d array, meaning you can refrence an individual pixel with an $pxlCorArr[y][x] starting at [0][0].

@VolodyaDaniliv I updated it to store the data in a 2d array so you can reference individual pixels with a sort of x,y coordinate in the array. Not sure if that's what you want but now that you know how it's done, I'm sure you can figure it out. — sachleen, Oct 28 '12 at 23:24

how to count number of pixels in image (php)

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