Greeting Cards Use Photoshop To Remove Printing And Scanning Nets

Greeting Cards Use Photoshop to remove printing and scanning nets

When we scan pictures in books, newspapers and magazines, we often find that the scanned pictures have net-like lines, this phenomenon is called netting. The reason for the web pattern is that the pictures in books, newspapers and magazines are actually composed of many small ink color dots, not the uniform color of the whole piece. This is especially obvious in newspapers, because newspapers do not need Shenzhen. The printing is too exquisite, so the dots are particularly large. When these small dots are scanned, they will produce mesh, which sometimes seriously affects the quality of the scan.

　　 Actually, there are some simple methods in Photoshop that can eliminate the moire on scanned images as much as possible. Below we introduce several common methods, which you can use as appropriate.

　　一, Despeckle method

　　 Execute Filter/Noise/Sespeckle, use Photoshop's Despeckle filter, this is the fastest and most convenient way to remove the texture.

　　 2. Enlargement and reduction method

　　 First scan the picture with a higher resolution, and then use Photoshop to reduce the picture to the required size.

　　 For example, the original picture was scanned with 200dpi, the picture size is 240x160, and the texture is obvious. We used 300dpi to scan, the image size was increased to 360x240, and the screen still had a slight texture. Then execute Image/ImageSize to reduce the picture to 240x160, and set the ResampleImage parameter to Bicubic.

After 　　 is reduced, the texture of the picture is almost completely eliminated, the color of the picture becomes quite flat, and the quality is improved a lot.

Although this method works well, it still has limitations. For example, when scanning a small picture, the scanning resolution is usually adjusted to a high level, so it is impossible to scan the picture with a higher optical resolution. It doesn't work anymore.

　　 Three, fuzzy method

　　Fuzzification is particularly effective for fine texture. Execute Filter/Blur/GaussianBlur to set the degree of blur, but this method has a disadvantage, that is, the texture is reduced, but the picture is also blurred. Be careful when using it.

　　Four, SmartBlur method

　　 1. Execute Filter/Blur/SmartBlur, first adjust Radius to the lowest and Threshold to the highest.

2. Then slowly increase the Radius to the right (it must be very slow and slow, or use the keyboard to enter a value), at this time the color of the screen seems to be gradually smoothed, until you feel that the grain lines on the screen seem to be invisible Stop immediately, otherwise the screen will become very blurred.

　　3. Next, decrease the Threshold to the left. At this time, the picture will gradually return to clarity. When it is less than one level, the net pattern will appear again. Carefully adjust an appropriate value and you are done.

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