another little quickie app. actually does all of the same things as the one i posted above, but it will also reduce the size of the image to half it's original size. no resampling, just a straight resize so that border pixels are not polluted. images will have the .half.tga extension rather than .tga.
edit: you have to install a couple of dlls to use this, don't blame, blame m$. you can get them
here