Design rules

Here I will try to gather all the awesome rules of design I come over while surfing the net. There are always some genius rules that I would need to follow when developing a new website or app, but you remember nothing when it comes to it. So here’s the list:

How to even out light/dark edges of images with GIMP


I was making a huge seamless texture of a concrete wall, when I found out that the original textures were taken with a light source more powerful at the right side. This gave me images where the left side was darker than the right one. The result of tiling this set of images was a long image with clear edges:
gimp seamless sides - start image