Scanning pictures in the desktop system compensation processing

Scanning work often encounters poor quality manuscripts, such as underexposure or overexposure, and serious color casts. In addition to processing in the scanning process, certain compensation processing can also be performed in the desktop system. However, the color of the monitor must be corrected first.
Color deviation (Curves)
Some originals may cause color cast due to a long period of time or an improperly-developed negative film, which can be corrected using this command. The advantage is that the curve transition is gentle and does not destroy the overall color balance.
Levels
This command is mainly used to deal with documents with uneven distribution of levels, such as underexposure or overexposure. The command has three small angle sliders of bright, midtone and dark tone. The use of three sliders can redistribute the picture level to achieve a more ideal tone distribution. If the underexposed original is thick and boring, move the highlight and middle slider to brighten the original tone. In addition, this command is more suitable for metal tools and can highlight textures of such documents.
Selective Color
Using this command, you can easily adjust the colors of the original, such as red leaves and people's skin colors, so that the green leaves will be more green and the skin color will be brighter. It provides color correction for yellow, magenta, blue, black, red, green, gray and other colors.
Despeckle
When scanning printed manuscripts, the scanning lens should be slightly imaginary to avoid the appearance of moire, but when the scanning is enlarged, the picture texture is more obvious. You can use this command to remove some textures.
Dust & Scratches
Some of the originals are of poor quality, with small scratches on the surface or coarse particles. The scanned images are repaired with rubber stamps. The workload is rather heavy. If you use this command, you can easily solve the problem. However, it has a drawback, it will lose a certain degree of picture clarity, use it to control its parameters and achieve better results.
Sharpen
The use of this command can enhance the sharpness of the edges of the picture. It is especially suitable for those pictures that require the texture and texture of the object to be displayed, such as gold and jade tools, metal tools, etc. The Unsharp Mask command in this command works best.