1. The digital images processed by the computer are also called dot-matrix graphics. You can think of the dot-matrix graphics as a combination of many square blocks of different colors, and for each square block of different colors we Call it a pixel.
2. Resolution refers to the number of pixels or pixels contained in a digital image per unit length. For example: an image resolution of every British? Plus? 00 points is called 1OODPI (Dots Per Inch).
3. In some digital image processing software, each point is called a pixel (Pixel), so the unit of resolution is also called PPI (Pixels Per Inch), whether it is DPI or PPI (DPI, this is a It is a more general unit). From the impression of traditional photo printing, we can know that the finer the particles of film and photo paper, the finer the image quality that the photo can show.
Since the digital image is composed of pixels, naturally, the higher the resolution (that is, the number of pixels contained in a unit length), the better the quality of the digital image. Therefore, it is conceivable that the image quality of a 300DPI digital image is definitely better than that of a 72DPI digital image.
4. Before scanning the image into a digital electronic image file, the output resolution and image magnification of the printed product must be determined.
5. The magnification is the ratio of the print scale of the image to the original size.
6. The resolution of the printed matter is usually based on the line number per line (Line Per Inch) as a unit, which varies with the type of printed matter and the type of paper. Generally speaking: newspaper: 85lpi; color magazine: 133, 150 or 175lpi; art album: 200lpi
7. In general, when we use paper with a smooth surface such as snow copper paper as the printing material, we will choose a resolution of 300pixels / inch (DPI) or 118pixels / cm (DPC) for the printing of digital images. Such images The resolution is used when printing to reach the line quality of 150 lines (150 Lines Per Inch).
8. The resolution of the digital image used on various types of printed matter depends on the value of the printed screen line to which the printed material is applied. If you want a higher quality of the number of network cables, the resolution of the digital image needs to be increased. Generally, you can double the value of the network cable to obtain the resolution value that the digital image should have. If the image needs to be enlarged, it must be multiplied by the magnification, as shown in the following formula:
Scanned image resolution = number of printed screen lines x 2 x magnification
For example: if the number of printed screen lines is 150 lines, the image must be enlarged by 3 times, and the scanning resolution must be 9OODPI (150LPIx2x3 times). Another example: when the printing screen line is 175lpi, if you want to print the image at the original scale, it is best to scan the image with a resolution of 35Oppi. If you want to enlarge the image twice for layout printing, you should use a scanning resolution of 70Oppi.
9. When processing black and white line art (Line Art), the resolution of the output device should be used as the scanning resolution. For example, when you want to output 12OOdpi black and white photo paper, you should use 12OOppi as the scanning resolution. If you only use a 300dpi radio printer for output, then use 30Oppi as the scanning resolution.
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