You need susie32 with tlg plugin.Click here
to download susie32Click here
to find susie's plugin
After inserting tlg plugin in susie's folder, open susie32 and select the .tlg image you need. Click on 'save as' and save your image as .bmp.
Then edit your image. After this, you need the correct version of krkrtpc converter (it depends on the version used in your game).
This is all I know. I hope it can help you^^