Adjusting Image Brightness and Contrast

Tracer will automatically adjust image intensity when the first file is loaded. However, it is usually helpful to adjust the image intensity for optimal viewing. It should be noted that adjustments to image intensity have no effect whatsoever on the files that you can save from Tracer; rather, they simply adjust the display for your convenience.

• Moderate intensity adjustments can be made by adjusting the slider at the bottom of the Tracer control panel. Adjustments are not made until you release the slider.
• More quantitative adjustments can be made by typing a new value into the box to the right of the intensity slider. You must hit the "Enter" or "Return" key on the keyboard for the typed value to take effect. The position of the slider is automatically readjusted when a new value is entered into this box.
• Contrast can be adjusted using the box to the left of the intensity slider. The value in this box is subtracted before the intensity adjustment is supplied, so you will need to increase the brightness each time you increase the contrast. Setting the contrast too high will cause some brain regions to appear completely black

Modified: December 15, 2001