Top Rated Scripts | PHP | Tutorials & Tips | Image Manipulation

PHP has the ability to upload files such as documents or images using the multipart/form-data protocol, but how do you use this and how do you resize the images after they are uploaded to create thumbnails or image repository, etc. This tutorial along with full source code shows you how.

Worried about bots? Then create CAPTCHA images to prevent bots from taking advantage of your site. You may be wondering what a CAPTCHA image is. Here's a brief synopsis from Wikipedia: A captcha (an acronym for "completely automated public Turing test to tell computers and humans apart") is a type of challenge-response test used in computing to determine whether or not the user is human. Captchas are used to prevent bots from using various types of computing services. Applications include preventing bots from taking part in online polls, registering for free email accounts (which may then be used to send spam), and, more recently, preventing bot-generated spam by requiring that the (unrecognized) sender pass a captcha test before the email message is delivered.

This is the easiest tutorial on how to rotate images by random. Code included.

Taking the smaller size between the width and height of an image, we crop that image to obtain a square which we save into a file. Online demo available.

This tutorial describes how to write text on to an existing PNG image using image functions in PHP by using a simple example. Each step is clearly described to make it easy to follow.

This tutorial shows how you can automate the process of adding watermarks on images from your site right when they are uploaded.

This tutorial focuses on a thumbnail generation script. Rather than generating a smaller representation of the image, it cuts out a section of the photograph to create an obscure snapshot of the photo itself. The thumbnail's size is variable also, so the script be used across different sites to create different sized thumbnails where needed.

With PHP you can create images from pure code. Throughout five sections, this tutorial shows how it's done. Topics include: Create the Ellipse, Modify an Existing Image, and more.

This tutorial will show how you can store the data via the HTML forms "File" feature in your MySQL database and how you can access and use this data in your webproject.

This is a comprehensive tutorial on how the graphics capabilities of PHP can be used to create simple bar charts in GIF and PNG format. Each example includes a graphical chart along with source code.

This tutorial will teach you the basics of auto generating your large image into condensed thumbnailed images using PHP. Complete code presented.

This article provides two functions for converting HTML color (like #AAED43) to three RGB values ($r = 170, $g = 237, $b = 67) and converting RGB values to HTML color.

This tutorial will describe how to create thumbnail images on the fly using PHP. Furthermore you will learn how to process a whole folder of images and create their thumbnails. Since this requires the GD library, you will need an installation of PHP with at least GD 2.0.1 enabled.

Provided script could be used as "text rasterization service" to generate arbitrarily text-images for a web site. MD5-based authorization is used to avoid image generation by unauthorized users.

This function can be used to resize images (with gif,png and jpg extensions) in PHP. Very easy to use in any PHP script.

This is a PHP Class useful if you need to resize images keeping their aspect ratio, using the GD Library. The new height is calculated proportionally to the new width’s size and reverse. For instance you have an image with the following dimensions: width – 1000, height – 800. Its thumbnail with a width of 250 will have the height of 200 (the ratio is kept).

This tutorial can give you an idea of how to center a text on an image using the GD Library. The script creates an image and centers a text on it.

This PHP can be used for achieving watermarking task easily. I hope it will help you too.

The article along with complete code sample demonstrates the use of GD library to generate thumbnails. The script first saves the uploaded image in a specific location, it then generates a thumbnail version of the image and finally saves the generated thumbnail image in JPEG format. The article also includes explanation of the calculations involved and a few other tips.

The article along with complete code sample demonstrates the use of PHP and GD library to watermark uploaded images on the fly. The method demonstrated here to watermark an uploaded image is to render a partially transparent line of text over the original image.