Free software to save and annotate computer screen images in .PNG format for use in other tools. Also saves short video and can create short video of computer screen actions for training, etc. in .SWF format. Pro version ($14.95/year) allows saving video in MPEG4 format and allows uploading to YouTube.
Image organizing and editing software included with new Macintosh computers and sold as part of iLife suite for Macintosh. Allows cropping, resizing, retouching, and color adjustment. Images can be saved in several formats. Available on library Macs in selected locations.
Left-click and hold and the mouse pointer turns into an "eyedropper"-like tool you can move around. It magnifies the pixels so you can choose one, then, when you let go of the mouse button, it saves the color code to your clipboard.