Quote: "Would the correct dimension for each animation be 260/6 = 43.3333....
Of course since its an integer, the rest would be truncated."
It would be your job to ensure that the strip of 6 images was the correct size.
You are also better having each 'cell' of the animation a multiple of 8 pixels - say 48 pixels wide instead of 43.3333.
This would give you an image size of 288x48 pixels containing 6 48x48 sprite images.
When your animation contains larger numbers of frames, you could switch to a 'grid' rather than a 'strip' of images so they are easier to edit in a paint program. For example, up to nine on a 3x3 grid and up to 16 on a 4x4 grid. (It doesn't matter that if you have 7 frames on a 3x3 grid the last two are empty).
TDK