How do I fill white background while resize image - php

Question

Current background is black. How to change the color to be white?
#assuming the mime type is correct
switch ($imgtype) {
case 'image/jpeg':
$source = imagecreatefromjpeg($source_image);
break;
case 'image/gif':
$source = imagecreatefromgif($source_image);
break;
case 'image/png':
$source = imagecreatefrompng($source_image);
break;
default:
die('Invalid image type.');
}
#Figure out the dimensions of the image and the dimensions of the desired thumbnail
$src_w = imagesx($source);
$src_h = imagesy($source);
#Do some math to figure out which way we'll need to crop the image
#to get it proportional to the new size, then crop or adjust as needed
$width = $info[0];
$height = $info[1];
$x_ratio = $tn_w / $src_w;
$y_ratio = $tn_h / $src_h;
if (($x_ratio * $height) < $tn_w) {
$new_h = ceil($x_ratio * $height);
$new_w = $tn_w;
} else {
$new_w = ceil($y_ratio * $width);
$new_h = $tn_h;
}
$x_mid = $new_w / 2;
$y_mid = $new_h / 2;
$newpic = imagecreatetruecolor(round($new_w), round($new_h));
imagecopyresampled($newpic, $source, 0, 0, 0, 0, $new_w, $new_h, $src_w, $src_h);
$final = imagecreatetruecolor($tn_w, $tn_h);
imagecopyresampled($final, $newpic, 0, 0, ($x_mid - ($tn_w / 2)), ($y_mid - ($tn_h / 2)), $tn_w, $tn_h, $tn_w, $tn_h);
#if we need to add a watermark
if ($wmsource) {
#find out what type of image the watermark is
$info = getimagesize($wmsource);
$imgtype = image_type_to_mime_type($info[2]);
#assuming the mime type is correct
switch ($imgtype) {
case 'image/jpeg':
$watermark = imagecreatefromjpeg($wmsource);
break;
case 'image/gif':
$watermark = imagecreatefromgif($wmsource);
break;
case 'image/png':
$watermark = imagecreatefrompng($wmsource);
break;
default:
die('Invalid watermark type.');
}
#if we're adding a watermark, figure out the size of the watermark
#and then place the watermark image on the bottom right of the image
$wm_w = imagesx($watermark);
$wm_h = imagesy($watermark);
imagecopy($final, $watermark, $tn_w - $wm_w, $tn_h - $wm_h, 0, 0, $tn_w, $tn_h);
}
if (imagejpeg($final, $destination, $quality)) {
return true;
}
return false;
}
Black & White

Answer 1

$final = imagecreatetruecolor($tn_w, $tn_h);
$backgroundColor = imagecolorallocate($final, 255, 255, 255);
imagefill($final, 0, 0, $backgroundColor);
//imagecopyresampled($final, $newpic, 0, 0, ($x_mid - ($tn_w / 2)), ($y_mid - ($tn_h / 2)), $tn_w, $tn_h, $tn_w, $tn_h);
imagecopy($final, $newpic, (($tn_w - $new_w)/ 2), (($tn_h - $new_h) / 2), 0, 0, $new_w, $new_h);
Here is your whole script (tested with portrait, landscape and square jpg):
<?php
function resize($source_image, $destination, $tn_w, $tn_h, $quality = 100, $wmsource = false)
{
$info = getimagesize($source_image);
$imgtype = image_type_to_mime_type($info[2]);
#assuming the mime type is correct
switch ($imgtype) {
case 'image/jpeg':
$source = imagecreatefromjpeg($source_image);
break;
case 'image/gif':
$source = imagecreatefromgif($source_image);
break;
case 'image/png':
$source = imagecreatefrompng($source_image);
break;
default:
die('Invalid image type.');
}
#Figure out the dimensions of the image and the dimensions of the desired thumbnail
$src_w = imagesx($source);
$src_h = imagesy($source);
#Do some math to figure out which way we'll need to crop the image
#to get it proportional to the new size, then crop or adjust as needed
$x_ratio = $tn_w / $src_w;
$y_ratio = $tn_h / $src_h;
if (($src_w <= $tn_w) && ($src_h <= $tn_h)) {
$new_w = $src_w;
$new_h = $src_h;
} elseif (($x_ratio * $src_h) < $tn_h) {
$new_h = ceil($x_ratio * $src_h);
$new_w = $tn_w;
} else {
$new_w = ceil($y_ratio * $src_w);
$new_h = $tn_h;
}
$newpic = imagecreatetruecolor(round($new_w), round($new_h));
imagecopyresampled($newpic, $source, 0, 0, 0, 0, $new_w, $new_h, $src_w, $src_h);
$final = imagecreatetruecolor($tn_w, $tn_h);
$backgroundColor = imagecolorallocate($final, 255, 255, 255);
imagefill($final, 0, 0, $backgroundColor);
//imagecopyresampled($final, $newpic, 0, 0, ($x_mid - ($tn_w / 2)), ($y_mid - ($tn_h / 2)), $tn_w, $tn_h, $tn_w, $tn_h);
imagecopy($final, $newpic, (($tn_w - $new_w)/ 2), (($tn_h - $new_h) / 2), 0, 0, $new_w, $new_h);
#if we need to add a watermark
if ($wmsource) {
#find out what type of image the watermark is
$info = getimagesize($wmsource);
$imgtype = image_type_to_mime_type($info[2]);
#assuming the mime type is correct
switch ($imgtype) {
case 'image/jpeg':
$watermark = imagecreatefromjpeg($wmsource);
break;
case 'image/gif':
$watermark = imagecreatefromgif($wmsource);
break;
case 'image/png':
$watermark = imagecreatefrompng($wmsource);
break;
default:
die('Invalid watermark type.');
}
#if we're adding a watermark, figure out the size of the watermark
#and then place the watermark image on the bottom right of the image
$wm_w = imagesx($watermark);
$wm_h = imagesy($watermark);
imagecopy($final, $watermark, $tn_w - $wm_w, $tn_h - $wm_h, 0, 0, $tn_w, $tn_h);
}
if (imagejpeg($final, $destination, $quality)) {
return true;
}
return false;
}
resize('teszt2.jpg', 'out.jpg', 100, 100);
?>
<img src="out.jpg">

Answer 2

This is working for me. Although it logically seems like it should fill the whole image with the $bgcolor, it only fills the parts that are "behind" the resampled image.
imagecopyresampled($resized_image, $original_image, $xoffset, $yoffset, 0, 0, $new_width, $new_height, $orig_width, $orig_height);
$bgcolor = imagecolorallocate($resized_image, $red, $green, $blue);
imagefill($resized_image, 0, 0, $bgcolor);