Aliasing and scanning resolutions

[sanking]

"Air Force standard on glass:
http://www.butzi.net/articles/scannersoft.htm

These sell for about $130. I wish the guys doing the scanner tests had one. They cut through the speculation pretty quickly.:-)"

What I am trying to figure out is if there are any standard procedures for using the standard Air Force test pattern, or other patterns?

I looked at Paul Butzi'a article on scanning in RGB and extracting just one of the colors in comparison to scanning in Grayscale. I a not surprised that he found more resolution in the blue channel image than with the other two color. However, I wonder if this is not due to the fact that in camera optical systems the diffraction limiting resolution of blue light is quite a bit higher than that of green and red light, rather than to differnces in specific scanners and/or scanner software?

Unfortunatley in my application, i.e. scanning 12X20" negatives at 1600 dpi, scanning in RGB is simply not an option as the resulting file is simply much too large to work with. Even in Grayscale a 16 bit file of a 12X20" negative is close to 700 mb.

[sanking]

"Unfortunatley in my application, i.e. scanning 12X20" negatives at 1600 dpi, scanning in RGB is simply not an option as the resulting file is simply much too large to work with. Even in Grayscale a 16 bit file of a 12X20" negative is close to 700 mb.

Actually a 16 bit Grayscale file of a 12X20" negative scanned at 1600 dpi is about 1.2 gig in size. The 700 mb size I mentioned is after downsizing from 1600 dpi to 1200 dpi.