tga won't convert to blp

I made a image in photoshop and saved it as a tga.
Everytime I try to convert it to blp is saves a blp with the file size at 0 bytes.

Image is 346x434

ALL BLP dimensions MUST be 1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024 etc.

If it's not one of the powers of two, it won't work. However, you can have non-matching ones.

A list of acceptable (except this isn't all) sizes are:

64x64 (icons)
128x256 (tilesets and large skins)
512x512 (High detail tilesets and skins)
1024x512 (crappily made loadscreen)

However, you can't add them together, e.g 512 + 128 doesn't give you a 768 working size.

Hope this helped.