Why did the texture I painted in texture paint mode disappear? I was following a tutorial on how to use the Texture Paint feature on blender so I could paint on a terrain I am modeling.
I was successful to paint the whole terrain with beautiful, exuberant vegetation, and crystalline water running through the valley.

So I saved my file, and I went to sleep.
But now I've reopened the file and everything seems like I left it yesterday, except that I can see no texture in the terrain...
The weird thing is that the textures i used are still there...
I don't understand, I barely understand the interface, please help.
I'm not even sure if the texture is there or if it was never "saved" or something... 



I am now going through the second part of the tutorial for possible answers but I (and hopefully many more) will be grateful for your help.
You need to save the image texture to an image file F3 (Menu: Image / Save As Image) otherwise all changes are lost. Blender indicates an unsaved texture in the UV-Editor with an asterisk at the Image Menu Item.



Another option would be to pack the image into the .blend file.