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What the scales show is that an unmanipulated linear greyscale produced by a digital camera has considerably darker shadows than a non-linear greyscale produced by film. Correcting the difference in levels leads to nasty posterisation bands in the shadow tones. These are 8bit scales and each step is as near to true as I could get (one or less levels error) so 12 or more bits will be better, but the correction of the linear greyscales to anything like the evenly spaced tonal rendition of the non-linear greyscales will always be an inferior option unless considerably greater bit depth is offered. It would be much better if digital cameras could output files with a non-linear characteristic curve. Regards, Anthony Farr > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of > Godfrey DiGiorgi > Sent: Friday, 18 August 2006 12:44 PM > To: Pentax-Discuss Mail List > Subject: Re: Tonal gradation in shadows - The $67 Question? > > I don't know what these grayscales and step wedges are supposed to be > showing me. > > G > -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net
