> -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED]]On Behalf Of Tom Rittenhouse > Sent: Saturday, January 05, 2002 7:40 PM > To: [EMAIL PROTECTED] > Subject: Re: Scanning Terminology Questions > > > Bit depth is how many tints of color are available. With 8 bits per color > you are limited to 256 tints. More is better.
This is the second person to make this false statement so it needs correction REAL FAST. With 8 bits per color you do not have 256 colors, you have 256 CUBED colors which is 16.7 MILLION colors, quite a difference. > > Density range is how much of a scale for pure white to pure black can be > recorded on an scale of 0=white to 4=black. Dynamic range is the > difference > between the two numbers. You could compare it to the contrast > grade of your > B$W paper. > > Another falsehood. Density range (Dmax) is the ratio between the lightest recorded intenity and the darkest recorded intensity. The number is the exponent using base 10. Thus if Dmax is 1, the range is 10:1 , if Dmax is 2, the range is 100:1, and if the Dmax is 3, the range is 1000:1, and so on. The higher the dmax the better on a scanner as it will be able to capure a much wider range of shades accurately. JCO - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
