Corel PaintShop Pro X7, DE User's Guide Page 76

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72 Corel PaintShop Pro X7 User Guide
If you plan to print the images, use inches or centimeters. By
starting with the final image dimensions, you can produce an
image that fits the page.
If you plan to export the images to another application (such as a
word-processing application), and then resize and print them, you
can use any of the options.
If you plan to display the images on the screen, use pixels.
You can resize an image after creating it, but doing so may result in
loss of image data. For more information about resizing images, see
“Retouching and restoring images” on page 229.
Image Resolution is measured in pixels per inch (ppi) or pixels per
centimeter. Low resolution can cause pixelation, a problem in which
large pixels produce coarse output. High resolution can increase an
image’s memory requirements without producing a proportional
increase in its quality.
Color Depth is measured according to the number of colors that a pixel
can display. Each pixel’s color information is stored in bits — from 1 to
48 bits. In a 1-bit image, each pixel can display only one of two colors
(black or white). In a 24-bit image, each pixel can display 1 of 16
million colors. Images with a color depth of 16 million colors look
good, but they also require more memory to store and edit. Not all
computer monitors can display 16 million colors, so some file formats
limit the number of supported colors. For example, GIF images, a
popular format for the Web, contain up to 256 colors (8-bit depth).
Many of the commands in Corel PaintShop Pro for applying effects and
correcting images work on 16 million–color images only. Therefore, it’s
best to create most images in 16 million colors. When you have
finished working on the image, you can decrease its color depth and
save it in another format.
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