Team Fortress 2 - Sprays (NEED HELP!)

Anyone know how to get a spray for TF2? In CS:S I could select some pre-made sprays from a list in-game, and could also select my very own spray from My Pictures. Sadly, I can't do this anymore because when I import an image from My Pictures, it says that there are too many pixels, and I don't know how to fix this problem.

Can anyone help? Thanks.

Is anyone brave enough to help me with this problem? :shock:

You could start by getting a free image editing program, eg GIMP and changing the res, it has to be square and steam gives you a list of supported resolutions

I think they are 64x64 px 128x128 px and 184x184 px