The Demo Site

This lesson is about the first step of retouching an image: Resolution and Image size The term resolution refers to the number of small squares known as pixels that describe an image and establish its detail. In the other word resolution is a measure of the clarity and sharpness of an image.computer graphics there three types of resolution:

1) Image resolution: refers to the number of pixels per unite of length in an image. The unite of length is usually “inch”, so image resolution is usually measured in pixel per inch or ppi. If two images have the same dimensions, the one with high resolution has more pixels than the other with less resolution.


2) Monitor resolution: refers to the number of pixels per unit of length on a monitor. Like image resolution, monitor resolution is usually measured in pixel per inch or ppi. Keep in mind that Image pixels are translated directly into monitor pixels. Therefore, if the image resolution is higher than the monitor resolution, the image appears larger onscreen than its specified print dimensions. For instance when you display a 1-x-1-inch, 192-ppi image on a 96-ppi monitor, the image fills a 2-x-2-inch area of the screen.

2) Printer resolution(output resolution: refers to the number of ink dot per inch.

*Note: the best quality of a printed image depends on the high-resolution printer and high-resolution image.

The zoom level of 100% means that the resolution of the image is exactly the same as the resolution of the monitor. When two resolutions are different, the image size onscreen may be larger or smaller than the image size will be when printed. For more information about zoom level read this lesson: Viewing images in Adobe Photoshop