PHP GD sharpness filter

Question

How can you make a sharpness filter with the PHP GD library?

So that this...

Answer 1

I think he wants to use PHP's GD library. It's pretty easy: function.imageconvolution. Just search for 'sharpen' on the page and you'll see a matrix you can use for sharpening. It works pretty well, although I would recommend using ImageMagick if you're trying to do anything more than that.