First, the type of resolution of plexiglass screen printing:
Several different resolutions are used in scan input and printout of image processing. Resolution refers to the maximum number of parallel lines, lines, and lines per unit length that can be recorded.
There are generally four types of resolutions that are commonly used:
1. Scan resolution Spi (sample/inch): resolution. It is used by scanners and digital cameras.
2. Display resolution PPi (pixels/inch): It is the number of display elements and the number of pixels.
3, print resolution Dpi (words/inch): the resolution of the printer output.
4, print copy image resolution LPi (line number / inch): image copy screen number, line frequency, halftone resolution. The common resolution uses Dpi instead of Spi, PPi.
Second, the type of resolution of plexiglass screen printing:
(A), scanning resolution (input resolution):
Scanner grayscale resolution is generally given in the description. Refers to the amount of information captured by the scanner on an inch (cm) original image. It is limited by the scanner's maximum optical resolution or interpolation resolution.
1. Optical resolution: It is the highest input resolution (also called physical resolution) that can be achieved by the scanner's own optical system. It is divided into horizontal resolution and vertical resolution and refers to the true resolution of the scanner (CCD).
(1) Horizontal Resolution: The true resolution of the optical system CCD, also known as optical resolution. Such as 300-600Dpi, 600-1200Dpi, 1000-2000Dpi, high block up to 4000-8000Dpi.
(2) The vertical resolution Dpi refers to the number of steps per inch that a stepper motor in a mechanical design can make in a scanner. It is related to the mechanical transmission part. It is important that the vertical resolution has no horizontal resolution.
2, the maximum resolution (interpolation resolution): refers to the optical resolution scanning, the maximum resolution of the scanner calculated by the software interpolation method. Usually 2-4 times higher than the optical resolution. This resolution does not guarantee image quality.
3, image resolution: refers to the amount of information stored in the image, generally in the horizontal and vertical direction of the image pixel (Pi × ei) to determine the number. If the resolution is 640-480, it means there are 640 pixels in the horizontal direction of the image. There are 480 pixels in the vertical direction. The larger the value is, the more pixels there are and the clearer the image. Some people think that the higher the image resolution is, the better it is wrong. Although it makes sense, it is not practical. Because the ability of the human eye to identify a certain distance can not see the nuances of the image. If an image is printed simultaneously with 600Dpi and 1000Dpi resolution, the quality of the result is the same. Therefore, it is not necessary to set the resolution too large. It is a waste of time due to the increase in the amount of information. However, the resolution should not be too small, otherwise the level of loss, image recovery difficult.
4. Display resolution: The total amount of information that a computer screen can display at a time. Refers to the number of dots 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 resolution 640 × 640, 800 × 600, 1024 × 768, large-screen display with high resolution. The size of the display resolution only affects the end user's convenience when working with the image, and does not affect the output quality of the image data.
(B) output resolution:
Output Resolution: Used only for printer output and print jobs, it represents the number of pixels per inch (Ppi or Dpi) required for the final document to be output to a laser imagesetter or printer. Copying methods, screening conventions, output device resolution, and other comprehensive settings determine the exact output resolution of the image.
Printer Resolution: Used to measure the number of dots per inch that the output device can produce in both horizontal and vertical directions. The higher the resolution of the printer (laser imagesetter), the finer the resulting dots, the more continuous the tone of the image. The resolution of the printer limits the maximum number of individual colors that the printer can reproduce.
Third, the relationship between input resolution and output resolution:
1, the input resolution: Dpi and Lpi relationship Dpi> Lpi half times
The relationship between input resolution (scan resolution) and output resolution (record resolution)
Input Resolution = Number of Recording Lines (Lpi Output Image Maximum Side Length in inches)/Input Image Maximum Side Length (inches) × 2
Scanning resolution is twice the number of screens, such as 80 lines/inch original scan setting is 150-200Dpi.
2, the output resolution: Dpi> Lpi ten to twenty times
The grayscale value output by the imagesetter is proportional to the resolution Dpi of the imagesetter and inversely proportional to the number of lines Lpi.
Gray level = output resolution Dpi(2+1)/image line Lpi
Such as electric sub-scanning 10 × 10, 16 × 16 pixels or more (electrical extension 23 × 23 scan a network). If the phototypesetting machine outputs the film, the original line number is 50-100 lines/inch, and 1200Dpi should be set on the phototypesetting machine.
If the gray level of the output image is required to be 256 bits, the output resolution of the recorder (scanner) should be set to 2500 Dpi or more to achieve a 150 line/inch screen number.
Fourth, plexiglass screen printing resolution formula conversion:
Optimal image resolution = 2 × screen number Scan resolution = N × image resolution (N represents the zoom ratio)
Color original scanning resolution = number of screens × 2 × magnification
Example: The size of the original is enlarged by 2 times, the number of screen lines is 150 DPi, and the set scanning resolution should be =2×2×150=600 Dpi.
Types of resolution for plexiglass screen printing
June 17 07:05:37, 2024
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