Hi Baslar, Are you sure you are comparing apples with apples?. For example, READ_JPEG has a keyword called TRUE: TRUE Use this keyword to specify the index of the dimension for color interleaving when reading a TrueColor image. The default is 1, for pixel interleaving, (3, m, n). A value of 2 indicates line interleaving (m, 3, n), and 3 indicates band interleaving, (m, n, 3). As you can see the color interleaving can be a difference. Cheers, fernando

Hi fernando now i understood that it is a different kind of comparing apples and apples problem. idl 0,0 is left bottom for matlab 0,0(matlab starts from 1 not zero also) is left top. Thanks for helping