"With only 255 bits per color, you can only have 255 levels of brightness held in an image." Errm -- not actually true. Since there are 3 colours (Red, Green and Blue), and each has a range of 0-255, the brightness range is 0-255 for each colour. So the total luminosisity is in the range 256 x 256 x 256 = 16777216. The brightness varies between Red=0, Green=0, Blue=0 (black) to R=255, G=255, B=255 (white). What is lost is the shades in between.. The average human eye can distinguish differences in colour/brightness to approx 1 part in 25,000,000. So I suspect that no-one really misses anything (with or without hi-dri). OTOH: hi-dri can sometimes add some nuances which add to th flavour (ading a touch here and there). For total perfctionists, this is a must-have. For simpletons like myself, it just not worth the effort.. Cheers, Diolma (No offence intended to anyone)