Hi Everyone, im having real problems trying to get my EVI calculations to work. Im using Landsat data and band math to create an EVI image for each data set. The formula i have been using is this: 2.5 *( (float(B4)-B3)/(B4+6*float(B3) - 7.5 *float(B1)+1) ) But all the results seem to be a negative value an the grey scale evi output image seems to be inverted in colour, so the areas that should be dark are bright and vise versa. Any help would be hugely appreciated as ive been stuck on this for a while! Thanks James