Qfyilyi

I have images with transparent BG an di need get real size picture in transparent BG...

(Image can be 500x500, but picture in image can be 440x250 and i need get this size - 440x250).... How do this in PHP and GD?

Thanks

so the real image size is a last non transparent pixel on x-side - first non transparent on x-side and the same on the y-side. so all you need is find them:)

transparent is then alpha is 127: A value between 0 and 127. 0 indicates completely opaque while 127 indicates completely transparent. - http://php.net/manual/de/function.imagecolorallocatealpha.php - so here you are

<?php

$image = 'test.png';

$image = imagecreatefrompng($image);



$width = imagesx($image);

$height = imagesy($image);



$colors = array();



$x_max = $y_max = 0;

$x_min = $width;

$y_min = $height;

for ($y = 0; $y < $height; ++$y)

{

    for ($x = 0; $x < $width; ++$x)

    {

        $rgb = imagecolorat($image, $x, $y);

        $color = imagecolorsforindex($image, $rgb);



        if (127 !== $color['alpha']) {

            $x_min = min($x_min, $x);

            $x_max = max($x_max, $x);

            $y_min = min($y_min, $y);

            $y_max = max($y_max, $y);

        }

    } 

}



echo 'width: ' . ($x_max - $x_min) . PHP_EOL;

echo 'height: ' . ($y_max - $y_min) . PHP_EOL;

output:

width: 180

height: 180