Generally, the higher the resolution of your image, the better the printed image quality. Some printing devices may require a specific image resolution, but for a photo inkjet printer, the resolution can range from 240 to 360 ppi.
If you need to print using a specific resolution, or you want to print an image significantly smaller or larger than the image's pixel dimensions allow, you can resample the image. Resampling involves either throwing away or adding pixels to the image. We will discuss resampling shortly.
When creating an image for print media, it's useful to specify image size in terms of the printed dimensions and the image resolution. These two measurements are referred to as the document size. They determine the total pixel count and therefore the file size of the image; document size and also determine the base size at