what you will need for this tutorial:
*The latest version of TSR Workshop found here
*s3ce (Sims3Pack CommandLine Extractor)
*A Graphics Editor capable of supporting DDS- I’m going to use in this tutorial Photoshop CS4
* DDS are File format used for textures in The Sims 3.
DDS has many types of internal formats, one being DXT.
There are several types of DXT which serve different purposes:
DXT1 is used for simple 3 channel images without an alpha channel (RGB)
DXT5 is used for images with an alpha channel (RGBA)
You probably need to install a plugin for your 2D application in order to work with DDS files.
For Photoshop :
Click on Download Current Version to download the file and then install it.
Slideshow on how to make the blush :