Quote Originally Posted by piebald
The histograms vary but a large number are biased towards the left. What does this mean exactly? I haven't got photoshop. Is there a free calibration tool somewhere?
If your histograms are towards the left, they are probably too dark. A very good introduction to histograms can be found at:

http://www.luminous-landscape.com/tu...stograms.shtml

I don't know of any free calibration tools. Perhaps someone else here has some information for you about this.