You can reduce the file size of an image by either reducing the color depth or by changing the resolution. Most paint programs will allow you to do either or both.
Reduces the number of pens used to produce the image. Each color in the image uses a different pen, so you are reducing the number of colors that will be displayed in the picture. If you reduce the color depth of your image, you will probably want to use a color-matching routine known as dithering.
Scaling (or resizing) allows you to change (either increase or decrease) the number of pixels used to display the image. To avoid distortion of the image, remember to select "keep the aspect ratio". This will keep the relative height and width of the image constant.
There are many ways to build an image library. You can:
A large collection of free images, by S. Palmer. (Must be unzipped)
Blue Ribbon Campaign graphics, by the Electronic Freedom Foundation.
Some really sharp buttons and horizontal lines from WebSuite.
Bullets, Stamps, Bars, and more.
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