Photoshop retouching Image (ii) Image resolution

Resolution

The first step in polishing a photograph in Photoshop is to ensure that the image has the correct graphics resolution. The graph resolution indicates the pixel value in a small rectangle, and describes an image and establishes the details. The resolution of a graph is determined by the pixel value or number of pixels of an image's width and height.

Pixels inside a photo image

Type of graphics resolution

In the computer graphics resolution, there are the following different types:

The pixel values in each cell in the direction of an image length are called image graphics resolutions, usually in pixels (PPI) per inch. A high-resolution image has more pixels, so a high-resolution file size exceeds the size of an image with the same size but low graphics resolution.

The pixel value of each cell in the display length direction is the graphics resolution of the display, usually measured in dots per inch (dpi). In Adobe Photoshop, image pixels are directly converted to the pixel of the display. This way, if the image resolution is higher than the display graphics resolution, the image is displayed on the screen larger than the size it prints. For example, when you display a 1 "x1" on a monitor on a single, DPI display, the image fills the 2 "X2" area of the screen.

       3.75 "x6" 72pp                                                                                  i3.75 "X6" 200ppi
      image size is 342k                           100% Screen display                Image size for 2.48mb      100% screen display

The number of dots per inch is determined by the print or output graphics resolution of the imagesetter or laser printer. Usually high-resolution images combined with high-resolution printers can produce better quality output. The resolution of the printed image is determined by the printer resolution and screen frequency or by the line line (LPI) per inch of the grid screen.