|AWARE [SYSTEMS]||Imaging expertise for the Delphi developer|
|TIFF and LibTiff Mailing List Archive|
LibTiff Mailing List
2002.09.19 00:20 "Re: Reading 16bits from a gray scale image", by Marti Maria
> I am displaying the image in 8bits so the final number > needs to be only 8bits, that is why I shifted the pixels > the opposite direction at the end. I am not sure if I am > doing this step correct either. I was thinking of dividing > by 257 but am unsure of the rounding process and think > that this is probably just as good because it is easier. The correct method would be to divide by 257 and then round: r = floor(c / 257.0 + 0.5) However this is painfull slow. If you don't care about memory, you could use a table of 64K for speeding up... other options would be to use fixed point. Anyway, for most usages a simple >> 8 is enough. Regards, Marti.