Use Photoshop to make the image more clear

The so-called "interpolation resolution" refers to the resolution provided by the scanner's built-in interpolation compensation technique, which is usually much higher than the optical resolution. However, it has little effect on improving the image quality, but it increases the size of the image file several times or even several times, and reduces the scanning speed. Therefore, in the general use of the school, if it is not a high-quality map picture printout for the geographical teaching group, selecting an interpolation resolution that is too high has little significance.

Post-processing of scanned images

Almost all scanners have four problems to varying degrees: 1, the overall contrast distortion; 2, image color cast; 3, mesh (net); 4, focal length is not allowed. Although many scanners counteract the effects of these adverse factors as much as possible by providing hardware or software to network and filter in the driver, for the best results, post-processing of scanned images is essential.

First, use the standard TWAIN interface to scan a true color picture. To adjust the overall contrast distortion, select “Image/Adjustment/Levels” in order. In the pop-up window, adjust the position of the left and right two small triangles and preview them. The window looks after the adjusted effect until it is satisfied. Usually the two small triangles are moved to the middle. After multiple scans of different pictures and repeated adjustments, we can “quantize” the overall contrast distortion of the scanner image, ie, determine the movement of the left and right two small triangles. Direction and magnitude. If the image is color-shifted, you can select "image/adjustment/change" in turn and select the effect image closest to the original image in the pop-up window. Similarly, after many experiments, the degree of color cast of the scanner is known.

The next step is to remove the dots, and perform "filter/colorless/speckle". How is the picture clearer? The last step is to make up for the error in the scanner's focal length, perform "filter/sharpening/USM sharpening", carefully adjust the parameters in the window, pay attention to the Radius value should not be adjusted too large, this can make the image Clearer. After many experiments, the error of the scanner's focal length is also known.

After some processing above, you will find the image more realistic and finer! If this is too much trouble for you, you can use the "action" function in Photoshop to make the above steps into an "action". When the next time you need to deal with it, just perform this "action" and you can do it all at once. !

Well, now that your "Governor of the Second Governor" has got through, coupled with excellent "weapons", the images will be vividly displayed in your electronic lesson plans!