How do i make images for my map in Radiant

I want to add some images some alien type stuff, but not sure how to add/convert to radiant format, what tools do i need, and where do i place saved images in radiant mod tools????

you need to use the " assetmanager " there is a tut for making custom textures.
a poster or texture are the same when it comes to adding images to your map, use the assman to convert your images to the iwi, a cod format, add the images to you iwd, the tut will give you all the details of how its done, post again if your having trouble with the tut