Community Week
Here is the second part of my little GIMP photo editing tutorial :)
Let's start with the easiest part!
When you want to desaturate your photo, there are three options.
If you chose Lightness, most likely your photo will have a slightly higher contrast than when you chose Luminosity, but it will also show more noise.
As you can see in the right picture, desaturating your photo based on luminosity will reduce the noise.
I almost never use Average, but it is pretty good when you want a mixture of both options :)
If you need to sharpen your photo, you can use the "Sharpen" or "Unsharp Mask" tool.
Anyway, both of these tools are