How to lighten picture in C# without actually iterating through all picture's pixels?

Question

I'm having problem with lightening picture. I know I could do this by increasing/decreasing pixel's values, however it's not what I'm looking for. I've been told that there's a way that do not require to iterate through all pixels and that it is much faster. How to do this? Thanks.

Answer 1

You use the ColorMatrix class in System.Drawing code to apply color transformations in a highly optimized way. Effects like brightness and contrast changes are directly supported. This web page shows you what the matrix should look like.