![]() ![]() ![]() The dots have physical size, as in the scanner “seeing” 300 square cells per inch, horizontally and vertically across its bed. Scanners RECORD dots and scanner drivers create pixels from those dots. What changed? The size of the DOTS created FROM the pixels.īy PIXELS per inch, I mean original, uninterpolated pixels, made in the camera, or made in the scanner, or made in post processing software, from the original scene or print. But that same file will make a small photo quality print about 4.5 by 8 inches at 240 PPI. If you need to be two yards away from a big print, It only needs 1920x1080 pixel HDTV resolution to look good. The farther away you are, the less your eyes can resolve. A 5x7 print, held about 9 to 13 inches from your eyes, can resolve around 300 PPI. Your concern should be to achieve the correct number of pixels in both dimensions to fill the needed print real estate at the appropriate PPI for that size print.Īn 8x10 photo print, held 13 to 20 inches from your eyes, can resolve about 240 PPI. THEN, base your scanning resolution on that. ![]() What you need to do is calculate the physical size of the largest print you will make. a) the drive space you are willing to dedicate to an output file or b) maximum print size. This means that you should test different scanning resolutions (dpi) and see at what values the files look best vs. While a 4800 dpi scan might provide more output pixels, scanning at lower values can produce output files that are equally good on a technical level when prints of equal size are viewed at reasonable viewing distances. Many scanners’ tech specs mention very hight dpi values and sometimes, the quality of the scans improves with higher values, but not necessarily the whole way. scanning software often mentions dpi for the target/output file and the scanning resolution is called low, medium or high, meaning that the scanner selects appropriate dpi values depending on your choice.Scanners scan with sensors that are sensitive to different colours and white light, or with sensors measuring brightness of all colours provided by different lights e.g. Dots are combined to form a pixel in scanning, while a pixel is brought on paper, not by rgb ink droplets, but by several droplets of cyan, magenta, yellow and black inks (with a basic 4-colour printer). dpi means dots per inch and is used in scanning and printing.ppi in an image means pixels per inch, each pixel containing rgb colour information.I am digitalizing the negatives and will only show it on pc / tv, not printing them, but still would like to have good quality on prints whenever someone would like that.Īre they not the same, number of pixels/dots per inch? I want to get the best quality, so i wonder. I am scanning color negatives as 48 bit TIF with iSRD and b/w as 16 bit TIF with xSRD. Is this an incorrect data in the file information? However when i scan with Silverfast they all say 300 dpi at the left bottom in Photoshop, no matter if i have set the resolution to 2400 / 4000 in Silverfast. When i scan with Nikon Scan or Epson Scan software the real resolution that i have set is exactly the same shown at the left bottom in Photoshop. Are they not the same, number of pixels/dots per inch? I am a little bit confused about ppi and dpi. With an Epson V850 i set the resolution in Silverfast to 2400 ppi and slider default of photo quality 300 ppi. With a Nikon V i set the resolution to 4000 in Silverfast and Nikon Scan software. Just curious what resolution people use in Silverfast to scan negatives.ĭo you just accept the photo quality 300 ppi and set the resolution slider? ![]()
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