Scanning resolutions for live graphics
If you plan to scan images at high resolution, the resolution should be between 1.5 and 2 times the line screen at which the files will print. For example, if your linescreen is to be 150 lines per inch, your scanning resolution should be between 225 and 300 pixels per inch. Line art should generally be scanned at 600 to 1,200 pixels per inch.
Remember that scaling your images in the page layout application will affect the resolution. For instance, increasing the size of an image to 200% cuts the resolution in half. Therefore, you should scale your art in the scanning application to the final size, and then import it into the page layout files.
Scanning density for images
The recommendations below will help to avoid problems associated with dot gain on press. Treat the parameters as guidelines. There will be instances where a trained scanner operator may notice distinctive qualities of individual photos that require deviation from these guidelines.
The first percentage below is the Highlight Dot and the second is the Shadow Dot
Uncoated stock WEB 3% 90%
Coated stock WEB 3% 92%
Uncoated stock SHEETFED 2% 92%
Coated stock SHEETFED 2% 96%
When adjusting the midtones, use the following guidelines to adjust for dot gain:
Uncoated stock WEB 25 30%
Coated stock WEB 15 20%
Uncoated stock SHEETFED 12% – 17%
Coated stock SHEETFED 7% – 12%
Specular highlight areas such as eyes or light bulbs, should drop out to 1%
Please share these recommendations with your scanning professional.