About Image Size And Resolution - Adobe 13101332 - Photoshop - Mac User Manual

Adobe Photoshop Help
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Vector graphics are resolution-independent—that is, they can be scaled to any size and
printed at any resolution without losing detail or clarity. As a result, vector graphics are the
best choice for representing bold graphics that must retain crisp lines when scaled to
various sizes—for example, logos.
Example of a vector graphic at different levels of magnification
Because computer monitors represent images by displaying them on a grid, both vector
and bitmap data is displayed as pixels on-screen.

About image size and resolution

In order to produce high-quality images, it is important to understand how the pixel data
of images is measured and displayed.
Pixel dimensions The number of pixels along the height and width of a bitmap image.
The display size of an image on-screen is determined by the pixel dimensions of the image
plus the size and setting of the monitor.
For example, a 15-inch monitor typically displays 800 pixels horizontally and 600 vertically.
An image with dimensions of 800 pixels by 600 pixels would fill this small screen. On a
larger monitor with an 800-by-600-pixel setting, the same image (with 800-by-600-pixel
dimensions) would still fill the screen, but each pixel would appear larger. Changing the
setting of this larger monitor to 1024-by-768 pixels would display the image at a smaller
size, occupying only part of the screen.
When preparing an image for online display (for example, a Web page that will be viewed
on a variety of monitors), pixel dimensions become especially important. Because your
image may be viewed on a 15-inch monitor, you may want to limit the size of your image
to 800-by-600 pixels to allow room for the Web browser window controls.
15"
832 x 624 / 640 x 480
Example of an image displayed on monitors of various sizes and resolutions
Using Help | Contents
Getting Images into Photoshop and ImageReady
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3:1
24:1
20"
1024 x 768 / 640 x 480
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