Limit WordPress Image Upload Size

function ter_limit_image_uploads($file){
$error_message = 'KB is to large. Please reduce the file size of your image to ' . TER_MAX_IMAGE_SIZE_KB . 'KB or less. Hosting space is limited and uploading large images will slow down your page loads. Use a tool such as http://toki-woki.net/p/Shrink-O-Matic/ to help you to resize your images. Target size: Width 1024px, file size 100KB-200KB';
$size_in_kb = $file['size'] / 1024;
if(preg_match('/image/',$file['type'])) if($size_in_kb > TER_MAX_IMAGE_SIZE_KB) $file['error'] = round($size_in_kb,2) . $error_message;
return $file;
}
add_filter('wp_handle_upload_prefilter','ter_limit_image_uploads'); //Limit uploaded image size

Replace broken images

//Dev image replacement to fix broken images on dev site
cfReplaceDevImages('devdomain.us','http://livedomain.com');

function cfReplaceDevImages(devDomain,liveDomainUrl){
if(window.location.host.indexOf(devDomain) == -1) return false;
jQuery(window).bind('load', function(){
jQuery('img').each(function(){
if((typeof this.naturalWidth != "undefined" && this.naturalWidth == 0) || this.readyState == 'uninitialized'){
var oldUrl = jQuery(this).attr('src').replace(/^.*//[^/]+/, '');
var newUrl = liveDomainUrl + oldUrl;
jQuery(this).attr('src',newUrl);
}
});
})
}

Image resize class

<?php
/*
* File: SimpleImage.php
* Author: Simon Jarvis
* Copyright: 2006 Simon Jarvis
* Date: 08/11/06
* Link: http://www.white-hat-web-design.co.uk/articles/php-image-resizing.php
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details:
* http://www.gnu.org/licenses/gpl.html
*
*/

class SimpleImage {

var $image;
var $image_type;

function load($filename) {
$image_info = getimagesize($filename);
$this->image_type = $image_info[2];
if( $this->image_type == IMAGETYPE_JPEG ) {
$this->image = imagecreatefromjpeg($filename);
} elseif( $this->image_type == IMAGETYPE_GIF ) {
$this->image = imagecreatefromgif($filename);
} elseif( $this->image_type == IMAGETYPE_PNG ) {
$this->image = imagecreatefrompng($filename);
}
}
function save($filename, $image_type=IMAGETYPE_JPEG, $compression=75, $permissions=null) {
if( $image_type == IMAGETYPE_JPEG ) {
imagejpeg($this->image,$filename,$compression);
} elseif( $image_type == IMAGETYPE_GIF ) {
imagegif($this->image,$filename);
} elseif( $image_type == IMAGETYPE_PNG ) {
imagepng($this->image,$filename);
}
if( $permissions != null) {
chmod($filename,$permissions);
}
}
function output($image_type=IMAGETYPE_JPEG) {
if( $image_type == IMAGETYPE_JPEG ) {
imagejpeg($this->image);
} elseif( $image_type == IMAGETYPE_GIF ) {
imagegif($this->image);
} elseif( $image_type == IMAGETYPE_PNG ) {
imagepng($this->image);
}
}
function getWidth() {
return imagesx($this->image);
}
function getHeight() {
return imagesy($this->image);
}
function resizeToHeight($height) {
$ratio = $height / $this->getHeight();
$width = $this->getWidth() * $ratio;
$this->resize($width,$height);
}
function resizeToWidth($width) {
$ratio = $width / $this->getWidth();
$height = $this->getheight() * $ratio;
$this->resize($width,$height);
}
function scale($scale) {
$width = $this->getWidth() * $scale/100;
$height = $this->getheight() * $scale/100;
$this->resize($width,$height);
}
function resize($width,$height) {
$new_image = imagecreatetruecolor($width, $height);
imagecopyresampled($new_image, $this->image, 0, 0, 0, 0, $width, $height, $this->getWidth(), $this->getHeight());
$this->image = $new_image;
}
}
?>