Kids Reading Books image pixel level play a role

Kids Reading Books image pixel level play a role

Pixels are the most basic units of an image, tiny square blocks of color. Pixel includes: pixel size, color, color depth, pixel position. Pixel size is related to resolution

Resolution The number of pixels per inch (unit length).

1. Image resolution is called PPi (pixels per inch). Different resolutions should be set for different purposes: a. The image resolution for screen display should be 72PPi or 96PPi; b. For 600Dpi printer output, 150PPi is required; c. For printing, a high resolution of 300PPi is required.

2. The resolution of the output device and the scanning resolution are in units of points per inch (dpi). Usually the output resolution of laser printers is 300-600dpi. Talk about the problem of scan resolution: because the customer sometimes requires to enlarge the size or reduce the size of the scan, not according to the original large size of the scan, then need to set the scanning resolution: scanning resolution =N × the optimal rate of the image. The N in the formula stands for scaling. For example, the width and height of the original manuscript are enlarged twice, and the number of hanging nets is 150lpi. The scanning resolution should be 2 ×2 ×150=600Dpi.

3, the printing resolution (printing dot plus the number of network cables) is line/inch (lpi) unit. Such as newspaper set 133Lpi, general print set 150Lpi, senior print set 175Lpi, in addition, Lpi is also related to the printing press. The image resolution should be 1.5-2 times the number of cables added. Generally follow the following formula: The best image resolution =2 x printing dot plus the number of network cables.