Image manipulation with javascript

I need the best way to manipulate with image in web br开发者_如何学JAVAowser with javascript. How create script which will change brightness or contrast. I google a little but i can find any acceptable solution.

Check CamanJS.
It is very flexible and powerful.

If your audience have modern browsers you can use the <canvas> tag.

Here is a tutorial: https://developer.mozilla.org/en/Canvas_tutorial

Look at library: http://www.pixastic.com/

This is not possible with javascript. You need to use GDLib or some other server side image manipulation library.

I'd say your best option here is to use something like flash, java, etc. JavaScript MIGHT be able to do this, but it will never be able to do it WELL. It is better to use a technology that has the power to do what you are asking without being stretched to it's limit.