Static Spot Meter Tool
During exposure, color balance, and tone curve selection, the same regions in an image often need to be metered repeatedly as changes are made. The digital spot meter features static spots 
that mark locations on the image and display the metered values for these points on the Color and Tone tab panels. This allows the photographer to mark specific points of interest in the image and recall their exposure values at any time. These markers display as color coded circles surrounding black circles similar to the spot meter in size. The markers are static in that they remain in the same loca- tions in the preview image from prescan to prescan, while the data displayed is from the most recent prescan.
Note: The colors of the spots do NOT indicate the RGB values of the image under the spot meter. The colors are only there so you can tell them apart.
To mark (save) a spot meter location, select the spot meter tool from the tool bar above the prescan image, then simply click the mouse button when the spot meter is directly over the region of interest, and a marker will be displayed there. Up to twelve locations can be marked in the preview image.
A line with the same color code as the marker also appears in the histogram display to indicate the relative position of this data point in the overall histogram. The same spots are also shown as colored squares on the tone curves to assist in locating and adjusting specific exposure values quickly. The RGB values will also adjust to reflect changes to the tone curve shape or position.
To clear all static meter locations, click the Clear Meter button on the Color tab panel, or use its keyboard shortcut,
To clear an individual static meter location, click on the static meter spot in the preview image to highlight the spot meter, then press the Delete keyboard button (Backspace key in Windows). The static meter location will be cleared and can then be reassigned by clicking in the preview image at a new location.
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