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((b5-b4)/float(b5+b4))(float((img1-img2)/img2))springs to mind. I have tried a lot of combinations of where the float is located, plus iterations like(float(img1-img2)/float(img2*1.0))floatin these expressions is unlikely to cure the problem. It seems more likely that you might have a divide-by-zero issue, since all the expressions you offer are divisions and image bands typically do have zero values. Thus you should expect there to be problematic results (such asInf) anywhere one or more of the denominators is zero (regardless of whether you use integral or floating point arithmetic). You can check this by forming the local minimum of all the bands to see whether it is everywhere zero.