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For images with white around the border (images of light skies, snow, and so on) this command works best if you
cover the image on the scanner with a piece of dark paper.
Image size and resolution
About image size and resolution
The image size (or pixel dimensions) of an image is a measure of the number of pixels along an image's width and
height. For example, your digital camera may take a photo that is 1024 pixels wide and 768 pixels high. These two
measurements have a direct correlation to the image's file size, and both are an indication of the amount of image
data in a photo.
Resolution is the fineness of detail you can see in an image. It is measured in pixels per inch (ppi). The more pixels
per inch, the greater the resolution. Generally, the higher the resolution of your image, the better the printed image
quality.
Although a digital image contains a specific amount of image data, it doesn't have a specific physical output size or
resolution. As you change the resolution of a file, its physical dimensions change, and as you change the width or
height of an image, its resolution changes.
You can see the relationship between image size and resolution in the Image Size dialog box (choose Image >
Resize > Image Size). Deselect Resample Image, because you don't want to change the amount of image data in your
photo. Then change the width or the height or the resolution. As you change one value, the other two values change
accordingly.
Same image printed at 72-ppi and 300-ppi; inset zoom 200%
If you need to print using a specific resolution, or if 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 to achieve the desired dimensions or resolution.
About printer resolution
Printer resolution is measured in ink dots per inch, also known as dpi. Generally, the more dots per inch, the finer
the printed output you'll get. Most inkjet printers have a resolution of 720 to 2880 dpi.
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