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----- Original Message ----- From: "Kennedy McEwen" <email@example.com> > That is why MTF is so useful - all the components just multiply together > to give the end result. The one exception is when you scan the image > you also introduce a "brick wall" limit and any residual resolution > above that is "reflected" to appear as the MTF of the aliased component. > Thus, appropriately tuning the MTF of the scanner can eliminate grain > entirely from the scanned image without loss of performance. Does it mean reducing scanner optics MTF? Or how can scanner do it otherwise? In other words scanner reduces resolution of the image to match the resolution of its sensors. I hope that I am using concepts of MTF and resolution in the same sence. The first question about this issue is whether a drum scanner uses the same technique or is it inherently the "problem" of CCDs? Theoretically this antialiasing technique should be applied to any device converting continuous tone image to matrix of pixels. On the other hand drum scanner can potentially sample in points forming an irregular pattern. The other question is a question of how large should this antialiasing degradation of MTF be comparing to let's say traditional darkroom prints. In the traditional darkroom there is no artificial "brick wall" limit of the pixel matrix that could produce a feeling of ability to improve the image quality continuously. Thank you, Igor - Turn off HTML mail features. Keep quoted material short. Use accurate subject lines. http://www.leben.com/lists for list instructions.