On the resolution of the hottest organic glass

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Plexiglas also talk about resolution

1. Types of resolution of plexiglass filament printing:

in the scanning input and printout of image processing, several different resolutions are used. Resolution refers to the maximum number of parallel points and lines that can be recorded within the unit length, unit line/mm

there are four commonly used resolutions:

1. Scanning resolution SPI (sample/inch): resolution. It is used by scanners and digital cameras

2. Display resolution PPI (pixels/inch): it is the display of pictures and texts. 2. The main body of the tension machine and the quantity indicated by the dynamometer and the quantity of phase elements

3. Print resolution DPI (word point/inch): the resolution of the printer output

4. Printing copy image resolution LPI (lines/inch): number of lines added, line frequency and halftone resolution of image copy. DPI is commonly used to replace SPI and PPI

II. Types of resolution for plexiglass filament printing:

(I). Scanning resolution (input resolution):

scanner gray-scale resolution, which is generally described in the manual. Refers to the amount of information obtained by the scanner per inch (CM) of the original image. It is limited by the maximum optical resolution or interpolation resolution of the scanner

1. Optical resolution: refers to the highest input resolution (also known as physical resolution) that can be achieved by the scanner's own optical system. It is divided into horizontal resolution and vertical resolution, which refers to the real resolution of the scanner (CCD)

(1) horizontal resolution: the real resolution of CCD of optical system, also known as optical resolution. For example, DPI, DPI and high gear can reach DPI

(2) the vertical resolution DPI refers to the number of steps that the stepper motor can move per inch in the mechanical design of the scanner, which is related to the mechanical transmission part. Vertical resolution is less important than horizontal resolution

2. Maximum resolution (interpolation resolution): refers to the maximum resolution of the scanner calculated by software interpolation method after optical resolution scanning. Usually times higher than optical resolution. This resolution does not guarantee image quality

3. Image resolution: refers to the amount of information stored in an image, which is generally determined by the number of pixels (PI EI) in the horizontal and vertical directions of the image. For example, the resolution indicates 640 pixels in the horizontal direction of the image. 480 pixels vertically. The higher the value, the more pixels, and the clearer the image. Some people think that the higher the image resolution, the better is wrong. Although it is reasonable, it is not practical. Because the recognition ability of the human eye can not see the subtle differences of the image at a certain distance. If an image is printed simultaneously with 600dpi and 1000dpi resolution, the result quality is the same. Therefore, it is unnecessary to set the resolution too large, which wastes time due to the increase of the amount of information. However, the resolution should not be too small, otherwise the hierarchy will be lost and the image restoration will be difficult

4. Display resolution: the total amount of information that can be displayed on the computer screen at one time. It refers to the number of points per inch in the horizontal direction on the display. The commonly used display screens are 14, 15, 17 and 19. There are three kinds of display resolutions: 640640, 800600 and 1024 768. The large screen display has high resolution. The size of the display resolution will only affect the convenience of the end user when using the image, and will not affect the output quality of the image data

(II) output resolution:

output resolution: only used for printer output and printing operations. It represents the number of pixels per inch (PPI or dpi) required for the final document to be sent to the laser Imagesetter or printer. The exact output resolution of the image is determined by the comprehensive settings of the copy method, the protocol and the resolution of the output device

printer resolution: used to measure the number of points per inch that can be generated by the output device in the horizontal and vertical directions. The higher the resolution of the printer (laser Imagesetter), the finer the points generated, and the more continuous the image tone. The printer's resolution limits the maximum number of individual colors that the printer can reproduce

III. relationship between input resolution and output resolution:

1. Input resolution: relationship between DPI and LPI DPI> LPI half times

relationship between input resolution (scanning resolution) and output resolution (recording resolution)

input resolution = number of recording lines Nanjing will promote the transformation of the chemical park into a new material industrial park (the maximum side length of LPI output image (inches)/the maximum side length of input image (inches) 2

the scanning resolution is twice the number of lines added, For example, the original scanning of 80 lines/inch is set to DPI

2 and the optimization and improvement of many instruments are based on these experiences and needs. The output resolution: 10 to 20 times of DPI LPI

the gray level value output by the imagesetter is directly proportional to the resolution DPI of the imagesetter and inversely proportional to the number of lines added LPI

gray level = output resolution DPI (2 + 1)/number of lines added to the image lpi

e.g. electric division scanning 1>>>>0 10, 16 16 pixels or more (electric extension 2323 scans a point). If the imagesetter outputs film, the original number of lines is the number of lines/inch, 1200dpi shall be set on the imagesetter

if the gray level of the output image is required to be 256bit, the output resolution of the recorder (scanner) should be set to more than 2500dpi to achieve the number of lines added of 150 lines/inch

IV. resolution formula conversion of plexiglass filament printing: optimal image resolution =2 lines scanning resolution =n image optimal resolution (n represents zoom magnification) color original scanning resolution = 2 lines magnification example: enlarge the original size by 2 times, the lines are 150dpi, and the set scanning resolution should be =2 150=600dpi

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