How to scan clear two-color images

Scanners are now widely used in various schools for the production of test papers or non-copiers. Most of them deal with text-type originals. If they are scanned in grayscale or color, the effect of needles is very poor, and the majority of schools use them. It is made by needle-punching into wax paper, so only bitmap mode can be selected during scanning. This is easy to handle for clearer manuscripts, but it can be scanned out in two colors like newspapers (with lots of impurities on the paper) or thin paper (with clear visibility to the back). The images are very expensive and are handled by the eraser in the image processing software. The workload is quite large.


For this reason, I have used Photoshop 5.0 to test many times and can process this type of image very cleanly. Methods as below:


Directly use Photoshop5.0 import to scan the image, you need to select grayscale when scanning, then process the image, select Image-Adjust-Brightness/Contrast in the menu, then come out a window to adjust Brightness/Contrast. , Select the Preview item to observe the effect of the adjustment; Brightness adjusts from +20 to +30, Contrast adjusts from +45 to +55, and can be determined based on the preview effect of the graphic The final value is then determined; select the Image-Mode-Bitmap in the menu to convert the image to a two-color bitmap mode. At this point, the simpler processing will scan the original image and it will be clean and clear. Now.