what's the best image input type for tesseract?

I had excellent results using TIFF in the past for a similar task. At the time I did some pre-processing using OpenCV and exported the result to a TIFF file that later was sent to tesseract. It was pretty good.

I've found TIFF to give far superior results to jpg, as well as being the best against all other types.

The original Tesseract programme would only work with TIFF files, leading me to believe it would be the most appropriate