Dikdik wrote:
Thanks... I'll do that for selected photos. The quality of the scans for the 2-1/4 negatives is much better than for the 35mm... a lot less degradation. These negatives are only 40 years old and not 50 or more. I downloaded the manual last night and I'll see what professional mode has to offer.
Added... I'll set the resolution as high as I can... disk space and speed is not an issue. Again thanks.
Dik
What matters when scanning is not the dpi setting, but the total image dimensions in FILE pixels. You will have to set a different (higher) dpi for 35mm film than for 6x4.5, or 6x6, or 6x7, or 6x9, to achieve the same print resolution.
Measure the
Target Size in PIXELS, rather than inches. Adjust the
dpi setting (how many samples will be taken from each inch of the original film) to get the pixel dimensions for the largest print you want to make. Leave the Scale at 100%.
Figure a minimum of 240 PPI for an 8x10 inch print (1920x2400 pixels). 300 PPI would be better, to allow for a little cropping (2400x3000 pixels). SMALLER prints will need 300 PPI (5x7) or 400 PPI (4x6). LARGER prints most often will need fewer pixels, because you view them from a greater distance.
A 6000x4000 pixel scan will make a nice 30x20 inch print, or anything smaller.
DO NOT confuse dpi with PPI. They are completely different concepts! dpi refers to the original copy sitting on the scanner bed — how many samples per inch of film does the scanner record? PPI refers to how many pixels in the file created by the scanner (or camera) will be spread over each inch of OUTPUT (i.e.; print).
PRINTER dpi is the number of dots of ink or spots of light that will *represent* (reproduce) the pixels in the file. Different printing technologies use different numbers of dots to achieve similar visual resolution.
Dots have dimensions, while pixels are just numbers representing brightness values in three colors. You can reproduce the same file of pixels at any size you want (although at resolutions lower than 240 PPI, the image will appear "jaggy" at close viewing distances). Or, you can interpolate a file to other dimensions... that maintains the same PPI reproduced, by creating fake pixels around the real ones, or by combining adjacent pixels and eliminating some to form a smaller version of the scene.