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[Gregory C]

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[LSI_Support]

Apple iMac, 800MHz G4, 1GB RAM, 75GB HDD, 17" LCD monitor
Mac OS X 10.2.1 Jaguar
Nikon Super Coolscan 4000ED
IA-20 APS adapter
SA-30 35mm film adapter
SilverFast SF-App v1.1.3
SilverFast AI (NikonM) v6.0.1d12

Output size cannot be specified accurately

GraphicConverter can rotate a JPEG image without loss if the size of the image in pixels is a multiple of 8. I therefore try to create scans whose sizes are multiples of 8. The size of the images I am currently creating have been specified as 1272 x 848 pixels. When I check the final images though, they are in fact a few pixels smaller in width and height than the specified size.

My scan settings are:

Scan resolution: 100 dpi
...(SF selected hardware resolution - Control key: 1000 dpi)
...(SF interpolated resolution - Control & Shift keys: 930 dpi)
Input dimensions: 137 x 91 pixels
Scale: 930.3%
Output dimensions: 1272 x 848 pixels
Filter: None

regards
Gregory

If the output dimension cannot be generate without loosing the proportions (chain between the two entry fields "output dimension" closed) the software will round the output up or down.

[Gregory C]

If the output dimension cannot be generate without loosing the proportions (chain between the two entry fields "output dimension" closed) the software will round the output up or down.

Does that mean that we can chose between accurate output and accurate proportions? That's fine by me. I'd prefer to have accurate pixel output, and the difference in proportion would be minute in most cases anyway.

regards
Gregory

[LSI_Support]

Yes, SF can either keep the proportion or keep the pixel accuracy - unless you scan at a resolution that is NOT a true optical resolution!!!
If the software interpolates, everything is possible.

true hardware resolutions are automatically selected when you only use the slider in SilverFast to set the output dpi. SF jumps from one optical resoultion to the next possible optical resolution.