Hi, I would like to make a conditional instruction “if” about several images witch built a “imageresult” with desired values : For each pixels of image1 and image2 If ( image1 Greater than image2) then imageresult = 2 else imageresult= 3 I already found this syntax : imageresult =(image1 GT image2) but that is not enough because the result is a mask image which contains O et 1 and it is not possible to choose the values of imageresult thank for your help Stéphane Lhomme