Resize image - Keep proportion - Add white background - php

Question

I want to resize my images to a square. Say I want a squared image of 500x500 and I have an image of 300x600
I want to resize that image down to 200x500 and then add a white background to it to make it 500x500
I got something working good by doing this:
$TargetImage = imagecreatetruecolor(300, 600);
imagecopyresampled(
$TargetImage, $SourceImage,
0, 0,
0, 0,
300, 600,
500, 500
);
$final = imagecreatetruecolor(500, 500);
$bg_color = imagecolorallocate ($final, 255, 255, 255)
imagefill($final, 0, 0, $bg_color);
imagecopyresampled(
$final, $TargetImage,
0, 0,
($x_mid - (500/ 2)), ($y_mid - (500/ 2)),
500, 500,
500, 500
);
It's doing almost EVERYTHING right. The picture is centered and everything. Except the background is black and not white:/
Anyone know what I'm doing wrong?

Answer 1

I think this is what you want:
<?php
$square=500;
// Load up the original image
$src = imagecreatefrompng('original.png');
$w = imagesx($src); // image width
$h = imagesy($src); // image height
printf("Orig: %dx%d\n",$w,$h);
// Create output canvas and fill with white
$final = imagecreatetruecolor($square,$square);
$bg_color = imagecolorallocate ($final, 255, 255, 255);
imagefill($final, 0, 0, $bg_color);
// Check if portrait or landscape
if($h>=$w){
// Portrait, i.e. tall image
$newh=$square;
$neww=intval($square*$w/$h);
printf("New: %dx%d\n",$neww,$newh);
// Resize and composite original image onto output canvas
imagecopyresampled(
$final, $src,
intval(($square-$neww)/2),0,
0,0,
$neww, $newh,
$w, $h);
} else {
// Landscape, i.e. wide image
$neww=$square;
$newh=intval($square*$h/$w);
printf("New: %dx%d\n",$neww,$newh);
imagecopyresampled(
$final, $src,
0,intval(($square-$newh)/2),
0,0,
$neww, $newh,
$w, $h);
}
// Write result
imagepng($final,"result.png");
?>
Note also, that if you want to scale down 300x600 to fit in 500x500 whilst maintaining aspect ratio, you will get 250x500 not 200x500.