Frank, On Thursday 19 July 2007 18:39:38 Frank Warmerdam wrote: > Do you have a sense where things are going wrong? Is it the scaling or > the LUT application? I think the problem lies in the LUT application. When all 3 bands end with 255:255 then you really say that the highest value is always white. When you apply a max scaling then the area with the maximum value is larger and more apparent.
> > I will note that the lut management code assumes that 0 maps to 0 and > 255 maps to 255. So I don't think your 255:0 specifications are > going to work. If I don't put the 255:0 there then there's an interpolation between the last pair (157:0) and 255:255 which is undesirable. By putting the 255:0 there I prevent the code from interpolating "back up". My last pair should formally be 254:0 which then is appended with 255:255. All in all I don't think that automatic catenation of pairs is a good idea because min and max values are fixed to black and white repectively. Best regards, Sander
