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Adobe Photoshop CS2

Adjusting Image Resolution

Images consist of pixels, which are little squares of color; the higher the number of pixels in an image, the more defined that image will appear. The density of pixels impacts image quality and file size. This density is most often measured as pixels per inch (ppi) and is the resolution value.

When preparing images for the Web, consider that images with high resolution have larger file sizes and take longer to load. To reduce the size of your file, reduce the dimensions of the image or decrease the resolution measurements (pixels/inch) of the image.
HINT: For best results, do all fine-tuning and adjusting of the image before you lower the resolution. This will result in a clearer image.

To change image resolution:

1. From the Image menu, select Image Size...
   The Image Size dialog box appears.
   

2. Under the Document Size section, in the Resolution text box, type the desired resolution
   NOTE: A common change in resolution is from 150 to 72 pixels per inch (ppi)

3. Click OK