What is the optical resolution of the scanner

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It refers to the actual amount of information that can be collected by the optical system of the scanner, that is, the resolution of the image sensor of the scanner. For example, a scanner with a maximum scanning range of 216mm and 297mm (suitable for A4 paper) can scan a maximum width of inches (216mm), and its photosensitive element contains 5100 cells and has an optical resolution of 5100 dots in inches = 600 dpi. Common optical resolutions are 300 600 dpi, 600 1200 dpi, 1200 2400 dpi or higher.

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Before understanding the optical resolution, it should be clear that the resolution of the scanner is divided into optical resolution and maximum resolution, because the maximum resolution is equivalent to the interpolation resolution and does not represent the real resolution of the scanner, so we should use the optical resolution when purchasing a scanner.

Optical resolution refers to the true resolution of a scanner's physical device. Moreover, the optical resolution of the scanner is multiplied by two numbers, such as 600*1200 lines, where the previous number represents the lateral resolution of the scanner, such as a CCD device with 5000 photosensitive units, for A4 format scanner, because the width of the paper on the A4 format is inches, therefore, the optical resolution of the scanner is 5000, in other words, the optical resolution of the scanner is 600dpi. The latter number represents the longitudinal resolution or mechanical resolution of the scanner, which is the resolution of the stepper motor used by the scanner, and the accuracy of the stepper motor of the scanner is the same as the lateral resolution of the scanner, but due to the influence of various mechanical factors, the actual accuracy of the scanner (the accuracy of the stepper motor) will be far from the level of lateral resolution, generally speaking.

The longitudinal resolution of scanners is twice as high as that of horizontal resolution, and sometimes even quadruple. Such as: 600*1200dpi.

But there is one thing to note: in order to show the high accuracy of their scanners, some manufacturers write 600*1200dpi as 1200*600dpi, so when judging the optical resolution of the scanner, the smallest one should prevail.

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The scanning resolution needs to be 300-600dpi clear.

300dpi is appropriate and the scanning speed is faster, but 400-600dpi will give you better scanning results for small font text. Scanning of line art requires a higher resolution, such as 1200dpi or higher fractional resolution.

Factors to consider when choosing a scan resolution:

1. If you are scanning as image material and you want to print it out, then it is best to use the highest optical resolution of the scanner to capture as much image detail as possible.

2. If you do not prepare high-precision output in the end, the more suitable resolution is generally 300dpi, which can basically reproduce the details of color **, and the file is not very large.

3、If it is only used as a screen display and web page material, then choose the basic appropriate resolution according to the final need**size,For example,You need to display the size of the screen almost the same as the original film**,Only need macro vertical boy72dpi on the line。

4. If it is an A4 size, 600DPI is enough, and the scanning can not only ensure that the image is clear, but also the file does not occupy a large memory. <>

The unit of optical resolution of a scanner is dpi, which stands for dot perinch.

Optical resolution refers to the number of points that can be expressed per simple base inch of the scanning object through the scanning element when the all-in-one machine realizes the scanning function. The unit is dpi, and the higher the dpi value, the better the scan effect.

It is represented by multiplying vertical and horizontal resolutions.

Before understanding the optical resolution, it should be clear that the resolution of the scanner is divided into optical resolution and maximum resolution, because the maximum resolution is the interpolation resolution, and does not represent the real resolution of the scanner, so the optical resolution should prevail when purchasing and ordering the former scanner.

dpi refers to pixels per inch, which is the scanning accuracy. The lower the dpi, the lower the clarity of the scan, due to the influence of the network transmission speed, the ** used on the web is 72 dpi, but the flushing ** can not use this parameter, it must be 300dpi or higher 350dpi.

For example, if you want to develop a 4*6-inch **, the scanning accuracy must be 300dpi, then the file size should be (4*300)*(6*300)=1200 pixels*1800 pixels.

Scan resolution refers to the degree of precision with which a scanner can capture the details of an image when an image or document is scanned. It's usually measured in dots per inch (dpi), which indicates the number of pixels a scanner can record within an inch. A higher scan resolution means more pixels** are captured, resulting in a sharper, more detailed image or document.

Common scanning resolutions include 300 dpi, 600 dpi, and 1200 dpi.

What does the resolution of the scanner mean? Q: I plan to buy a scanner due to work needs, I see that the information introduces optical resolution, horizontal resolution, vertical resolution, maximum resolution, color resolution and other indicators, what does the resolution of the scanner mean?

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Answer: Optical resolution refers to the actual amount of information that can be collected by the optical system of the scanner, that is, the resolution of the CCD, which is specifically divided into transverse resolution and longitudinal resolution, where the transverse resolution is determined by the quantity and quality of the CCD containing the photosensitive unit', which is optical resolution in the true sense of the word. If a scanner with an A4 scanning range has a CCD containing 5100 cells, the optical resolution will be 5100 dot inches = 600 dpi.

The longitudinal resolution is usually indexed to twice the transverse resolution.

The maximum resolution is actually the interpolation resolution, which is to increase the resolution of the megabyte by finding the average value of color or grayscale between adjacent pixels to increase the number of pixels, and the pixel value of the image can be increased in the maximum resolution mode, but more image details can not be added. Color resolution, also known as color depth or color level, etc., is an indicator that represents the degree of color or grayscale delicacy of the scanner, theoretically speaking, the more color bits, the more realistic the color of the scan, of which the 24bit color resolution means that 1677216 colors can be resolved, and the general application is completely sufficient.

Scanner optical resolution refers to how many realistic pixels can be scanned per inch. Its unit is ppi (pixel perlnch) for easy understanding for general users, and dpi (dot perlnch) can also be used equivalently. The more pixel dots dpi per unit length of the scanned image, the stronger the ability to express the details of the original image.

As a scanning term, optical resolution actually has two meanings: horizontal resolution and vertical resolution. The Microtek 5Canmaler 4850 has an optical resolution of 2400 x 4800dpi.

The former is a horizontal scan resolution, indicating the ability to scan 2400 pixels per inch; The latter is vertical resolution, which indicates the fineness in the direction of movement of the scan head. The computer requires that the images delivered to it have the same horizontal and vertical resolution. So, for the Microtek 5CanMaker4850, 2400 x 2400dpi is the maximum resolution without interpolation, in other words, the Microtek 5Canmaler4850.

The maximum natural image resolution is 2400 x 2400 dpl interpolated resolution is another type of resolution that indicates the performance of the scanner, also known as the maximum resolution. Interpolation resolution is the higher resolution obtained by inserting additional image points between hardware-generated image points using software techniques. Software interpolation technology can improve the quality of scanned images to a certain extent, especially when scanning black-and-white images or enlarging small originals, but it is basically not very useful for color and grayscale scanning interpolation resolution.

On the **, right-click the attribute summary advanced, you can see, the figure below, the resolution is 96You don't need to re-scan it, if your image resolution is larger than 80, you can modify it with the help of Photoshop and other software.

300dpi means that there are 300 x 300 = 90,000 pixels in a square with a length and width of 1 inch.