Nikon 9235 Reference Manual - Page 60

Calibration Under most circumstances, calibration is performed automatically at intervals when no media are inserted in the scanner. If film has been left in the scanner for a long period of time, you may need to remove the film and click the Calibrate button to recalibrate the scanner. Interpolation Method (LS-2000/COOLSCAN III only) Your scanner can scan at 2,700 ppi and at any resolution below this value that can be produced by dividing 2,700 by a whole number (1,350 ppi, 900 ppi, 675 dpi, etc.). At other resolutions, pixels must be calculated by computer algorithm to make up the specified number of pixels per inch. The interpolation method is the algorithm used in generating these extra pixels. If you are using the MA-20 (S), remove the media from the adapter before clicking Calibrate. If you are using the SA-21/ SA-20 or SA-30, the film while automatically be ejected during calibration and feed back into the scanner when calibration is complete. In the case of the IA-20 (S), you will be prompted to rewind the film before calibration begins. The following interpolation methods are available: Method Bilinear Neighbor Description Extra pixels are generated using a bilinear algorithm. Extra pixels are generated using a "nearest neighbor" algorithm. None No interpolation is performed. Note that this may result in the output size for the scanned image being larger than that specified in the Crop palette. Reference:The Tool Chest 59