News Feed
Sections




News Archive
Looking for more information on how to do PHP the right way? Check out PHP: The Right Way

Bubble.ro:
How to create the histogram of an image using PHP
November 01, 2006 @ 10:18:43

On the Bubble.ro website, there's an interesting tutorial that guides you through the creation of a histogram for any image (that PHP can handle) automatically with a little GD functionality.

The algorithm to calculate the histogram for an image is pretty straight forward if you know how to extract the RGB value of each pixel, by counting the number of pixels of each value (and then divide by the total number of pixels in order to get a normalized value).

They share the simple script that grabs the image's data, analyzes it, and, superimposed on one corner of it, places the histogram image. They have the full source and examples available for download.

0 comments voice your opinion now!
histogram image gd automatically highs lows histogram image gd automatically highs lows


blog comments powered by Disqus

Similar Posts

DevShed: Creating Image Streams from Existing Graphics with the GD Library in PHP

Kore Nordmann's Blog: Comparision of PHP image libraries

PHPMaster.com: Watermarking Images

Secunia.com: PHP "gdPngReadData()" Truncated PNG Data Denial of Service

PHPBuilder.com: Create a CAPTCHA Script with PHP


Community Events





Don't see your event here?
Let us know!


tool list composer version laravel voicesoftheelephpant community framework language introduction podcast opinion security conference symfony interview library artisanfiles release series

All content copyright, 2014 PHPDeveloper.org :: info@phpdeveloper.org - Powered by the Solar PHP Framework