View Full Version : Latest work on emulsions

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10-31-2007, 12:23 PM
PE -

My craptacular little all-in-one HP scanner/printer has a similar problem .

I've also seen this sort of patterning in an Epson flatbed scanner. I think it may be aliasing the clock signals for the CCD with 60hz electrical hum. It would appear in areas where the contrast has been raised with the tonal curve such as in denser areas where the signal is low compared to the noise. Ususally you would see this when scanning a transparancy in the shadows, it should be less of a problem when scanning a negative which has a limited Dmax. REgards - Jim

11-01-2007, 08:10 AM
Nothing like seeing results like that to get me nudged back into action....

Outstanding work...

Bob M.