BEFORE YOU BEGIN
Just jump right in.
77 Convert Between Image Formats
78 Change Photo Resolution and Size
86 About Size and Resolution
One of the key factors affecting the size of an image file is the maximum number of colors it can include. If you're working on an image to be shared over the Internet, small file size is often a high priority. One way you can reduce a file's size is to reduce its color depth. Of course, reducing the number of colors in an image's palette can also reduce its quality because a limited number of colors are used instead of a full spectrum.
A 16-million-color image might not actually contain 16 million colors, even though it is capable of doing so. Reducing the color depth for images that are generally monochromatic to start with might not appreciably reduce the quality but will shrink the file sizes considerably.
Because some commands are available only for grayscale images or for those that use 16 million colors, you might sometimes find yourself temporarily increasing an image's color depth. This won't, however, improve the resolution of a low-resolution imageincreasing an image's color palette simply makes more colors available for use; it does not tell PSP where to use them in an image to boost detail and clarity.
If file size is your main priority, you can compress an image into GIF, JPEG, or PNG format (for example), a process that also reduces its color palette a bit more scientifically than the method discussed here. You can also convert an image to grayscale to reduce its color depth.
If you're curious about how many colors your image is currently using, choose Image, Count Image Colors . To check the current color depth, look at the right end of the status bar.
Display Increase/Decrease Color Depth Menu
Choose Image, Increase Color Depth from the menu bar to increase the number of colors in an image; choose Image, Decrease Color Depth to reduce the number of colors instead.
Select Color Depth
Select the color depth you want from the menu that appears. If you're increasing color depth, the image is not changed, but more colors become available for you to use.
If you're reducing the color depth, a dialog box appears, allowing you to choose how Paint Shop Pro will narrow the color palette and adjust image colors. Continue to step 3.
89. Change Color Depth
If Reducing Colors, Choose Options and Click OK
If you're reducing colors in an image, select how you want PSP to choose the colors for the palette by selecting options in the dialog box that appears. (The dialog box you see depends on which color depth option you selected in step 2.) Here are some choices you might encounterselect one of the following and click OK :