Mon Jun 13 16:40:16 CST 2022
Why is the scanning effect of the scanner just bought not good, the quality of the scanner is not good, or where the scanner fails. Today, let's discuss the setting of bar code scanner and how to achieve the best scanning effect and improve work efficiency. A total of seven points are summarized as follows:
1. Determine the appropriate scanning method
Using a bar code scanner can scan images, words and photos. Different scanning objects have different scanning methods. Open the driver interface of the barcode scanner, and we find that the program provides three scanning options, among which the "black-and-white" mode is applicable to the original or OCR recognition of white and black characters; "Gray scale" is applicable to the mixed layout of pictures and texts with both pictures and texts. This type of scanning takes into account both texts and pictures with multiple gray levels; "Photo" is suitable for scanning color photos. It needs to sample and store the three channels of red, green and blue at multiple levels. Before scanning, we must first select an appropriate scanning method according to the scanned object, so as to obtain high scanning effect.
2. Optimize the resolution of bar code scanning gun
The higher the scanning resolution is, the clearer the image will be. However, considering that if the resolution of the output device is exceeded, no matter how clear the image can be printed, it just takes up more disk space and has no practical value. Therefore, it is necessary to choose the appropriate scanning resolution. Large images can be scaled down after scanning. For example, we scan a 4-bit image at 600dpi × 4-inch image. Reduce it to 2 in the assembly program × 2 inches, its resolution is 1200 DPI.
3. Set the file size
Whether the scanned object is text, image or photo, it is an image after output through the bar code scanner, and the size of the image size is directly related to the size of the file capacity. Therefore, we should set the size of the file size when scanning. Generally, the barcode scanner can automatically calculate the file size when previewing the original sample, but understanding the calculation method of file size is more helpful for you to make appropriate choices when managing scanned files and determining scanning resolution. The calculation formula of binary image file is: horizontal size × Vertical dimension × [2 (scanning resolution) / 8]. The calculation formula of color image file is: horizontal size × Vertical dimension × [2 (scanning resolution) / 3].
4. Set scanning parameters
When pre scanning images, the barcode scanner scans according to the default scanning parameter value of the system. The effect may be different for different scanning objects and different scanning methods. Therefore, in order to obtain high image scanning quality, we can manually adjust the parameters. For example, when the brightness of gray scale and color images is too bright or too dark, we can change the brightness by dragging the slider on the brightness slider. If the brightness is too high, the image will look white; If the brightness is too low, it is too dark. You should make the brightness of the image moderate when you drag the brightness slider. Similarly, for other parameters, we can make local modifications according to the same adjustment method until our visual effect is satisfactory. In short, a good scanned image should try to meet the printing output without further adjustment by image processing software, and be closest to the printing quality.
5. Store the curve and load the scanning software
Sometimes, in order to get the best color and scanning contrast, we first do a low resolution scanning, open it in Photoshop, and use the curve function of Photoshop to improve the color and contrast. Store the curve and load it back into the scanning software. Your barcode scanner will now use this color correction curve to build better high-resolution files. If you scan several images with a similar gamut range, you can use the same curves, and you can often store the curves and load them back as needed.
6. Place the scanned object according to the desired effect
In the process of actually using images, we sometimes hope to obtain images with tilt effect. Many designers often input the images into the computer through bar code scanner, and then use professional image software to rotate the images to achieve the rotation effect. However, this process is a waste of time. According to the rotation angle, The quality of the image will decline. If we know how the image is placed on the page in advance, then using the protractor and the bottom edge of the original to place the original on the roller and platform at an accurate angle will get the highest quality image without rotating in the image processing software.