Fixing Sprites and Textures from the Mobile Port

Ripping sprites and textures from the mobile version of Sonic the Hedgehog 4: Episode I (I don't know if the mobile version of the second episode uses these as well, I'll investigate once I figure out a way to extract the second episode's .OBB file) is quite easy. However, you'll need to fix them before extracting them.

1. Fixing the colors

First, import your sprite or texture into PVRTexTool by dragging and dropping it onto the program. Next, right-click the box circled in the image below:

Then select "sRGB".

2. Fixing the alpha channel (transparency)

Not every sprite and texture has an alpha channel, but some do. To fix them, you'll need to click on the "A" button near the bottom-right corner of the window:

The end result should look something like this:

3. Exporting a sprite or texture

To export a sprite or texture, go to "File > Save Image..." and save it wherever you want.