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DevShed:
Filtering Image Streams with the GD Library in PHP
August 27, 2007 @ 11:25:00

DevShed concludes their series on using the GD graphics libraries in PHP with thie new article focusing on the use of some of the simple filtering functionality the library has to offer.

In this article I'm going to demonstrate how the GD library can be used to apply some basic graphic filters (yes, like Photoshop, but much simpler) by utilizing the versatility of a brand new function called "imagefilter()". As you'll see shortly, with this function it is possible to reverse, blur and highlight the colors of a determined image, as well as convert it to its grayscale version, among other things.

They use the imagefilter function in a few different examples - altering the colors in an image, working with contrast and brightness and various other filters (like smoothing, embossing, blurring and colorizing).

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Pierre's Blog:
What's new in GD, 5.1.x
December 09, 2005 @ 15:07:04

From Pierre's blog today, there's this new post about some of the things that are new for GD in 5.1.x.

I brought image convolutions to the public in PHP 5.1.0 (was lying in cvs for some months already), using a 3x3 matrix, the factor and the offset. A lot of really usefull or nice effects can be realized using image convolutions. I will show you some here.

The second introduction will be available in 5.1.2, it is nothing really new and I was even sure it was already done.

Be sure to check out the post for examples of what can be done with these new, integrated features. The "Gaussian Blur" is very nice...

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graphics image GD gaussian blur emboss graphics image GD gaussian blur emboss



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