Image SXM Help

NIH Image

Continuously captures and displays video using one of the frame grabber cards directly supported by NIH Image (see list in Appendix B of the NIH Image manual) or a QuickTime compatible video digitizer, such as the ones built into AV Macs and the PowerMac 7500/8500. The capture rate varies from 4 to 12 frames per second, with newer Macs with built-in monitor support providing the fastest rate. Notice how, during continuous capture, the name of this command changes to "Stop Capturing" and "(Live)" appears in the title bar. To "freeze" the image, select "Stop Capturing", type cmd-G, or click in the Camera window with any tool except the magnifying glass or the grabber. While capturing, you are allowed to change brightness and contrast (directly supported cards only), alter color schemes, and zoom or pan the image. Histograms are continuously calculated and displayed if you select Show Histogram while the Camera window is in "Live" mode. Newly created Camera windows inherit the look-up table, as well as any spatial or density calibration, of the currently active window. The size of the Camera window is fixed at 640 x 480 for NTSC video and 768 x 512 for PAL. Smaller selections can be saved by creating a rectangular selection and using the Duplicate or Save As commands.