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What is the barcode scanner resolution how to view?

Release Time:2020-07-10

Resolution is an important part of the barcode scanner, and its level is related to the quality of the scanner itself and the level of scanning clarity. The resolution unit of the barcode scanner is dpi, which means the number of pixels per inch.

　　

 

 

Resolution

Each type of scanner is marked with its optical resolution and maximum resolution. The unit of resolution is dpi,dpi is the abbreviation of dot per inch, which means the number of pixels per inch.

optical resolution

It refers to the actual amount of information that the optical system of the scanner can collect, that is, the resolution of the photosensitive element of the scanner. For example, a scanner with a maximum scanning range of 216mm × 297mm (suitable for A4 paper) can scan a maximum width of 8.5 inches (216mm), its photosensitive original contains 5100 units, and its optical resolution is 5100 dots ÷ 8.5 inches = 600dpi. Common optical resolutions are 300 x 600dpi, 600 x 1200dpi, 1200 x 2400dpi or higher.

Color resolution (an important parameter for the display of the data collector)

Also known as color depth, color mode, color bit or color scale, in short, is an indicator of the scanner's degree of color or grayscale resolution, and its unit is bit (bit). The exact meaning of color bits is how many "bits" are used to represent a scanned pixel. For example, 1bit can only represent black and white pixels, because the numbers in the computer use binary, 1bit can only represent two values (21=2), namely 0 and 1, which represent black and white respectively. 8bit can represent 256 gray levels (28=256), which represent different gray levels from black to white. 24bit can represent 16777216 colors (24=16777216), generally, colors above 24bit are true colors, and of course, models with 30bit, 36bit and 42bit are used. In theory, the more color digits, the more realistic the color.

The relationship between barcode scanner resolution and file size

General scanning applications can automatically calculate the file size when you preview the original manuscript, but knowing how to calculate the file size is more helpful for you to make appropriate choices when managing scanned files and determining scan resolution. The calculation formula for a black-and-white image file is: horizontal size × vertical size × (scanning resolution) 2 ÷ 8. The calculation formula for a color image file is: horizontal size×vertical size× (scanning resolution) 2 ×color depth × 1/8. For example, if a common color photo (3.5 × 5 inches) is scanned in a 24-bit color RGB mode with a scanning resolution of 300dpi, the length of the obtained image file is 5 × 3.5 × 300 2 × 24 × 1/8=4725000Byte, I .e. 4.7MB.