Ch. 4 - Taking a Picture
Captures for Preparation and Modification
User's Guide to the SPOT Cooled Color Digital Camera, 6/9/98
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To use the Recall Previous Exposure option, follow these steps:
1.
After capturing an image, select the Recall Previous Exposure option from the
Camera menu. The Exposure window displays the values from the last image, as
illustrated below:
!
Note: If you change the current image setup, the Recall Previous Exposure option
will be unavailable until you take another picture.
2.
Select an image setup from the scroll bar and press OK, or click on the Cancel button
to exit the window without saving the exposure values.
3.
Use the Get Image (exposure from setup) to capture an image with the new Exposure
and gain values.
Compute White Balance Values
White balance is the ratio of red, green, and blue exposure times necessary to achieve the
proper color rendition for an image. Many factors impact the coloration of an image
capture, including lamp voltage, coloration of the slide, and coloration of the micro-
scope’s objectives. In order to minimize the impact of these factors, the Compute White
Balance feature samples the color of your light source and calculates the exposure values
needed to produce images where the white areas are white and the color areas are true.
You should perform a new white balance calculation in the following cases:
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When you start a new image capture session.
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When you change the lamp voltage.
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When you switch to a different objective on the microscope.
When you open an image setup, the Image Setup screen displays the default white
balance values for that Setup, which are the values that were last saved to the Image
Setup. If you capture an image without computing a new white balance, SPOT uses the
default values.
