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220 WinView/32 Manual Version 2.4.M
Brightness/Contrast dialog box
The Brightness/Contrast dialog box, opened by selecting Palette on the Display menu,
allows you to adjust the brightness and contrast of the active image. Five different
transfer functions of monitor-brightness versus pixel value can be selected. Because
CCD images can span a very wide brightness range and may contain complex features in
both the brightest and faintest areas, linearly mapping pixel values to display brightness
may not provide the best display of all of an image’s features. The five transfer functions
provided allow the display to be tailored to the characteristics of the image, allowing the
more obscure features to be better observed than might otherwise be the case.
A plot of the function selected function that includes the effect of the brightness and
contrast settings is displayed. The effect of changing the contrast/brightness or selecting
a different transfer function can immediately be seen in the displayed image. At the same
time, the displayed transfer function curve changes to reflect the settings. It is important
to keep in mind that these adjustments have no effect on the actual data, but rather only
affect how it is presented on the screen. The default settings for contrast and brightness
are 50 and the default transfer function is linear.
You can also select the Palette Type, Grayscale, Color, or Inverted. Again, the selection
made has no effect on the actual data but only on how it appears on the computer
monitor.
Parameters
Brightness:
Adjusts overall image brightness. Range is 0 to 100 with 50 as the default.
The default can be restored at any time by clicking on the small square above the
center of the brightness scale.
Contrast:
Adjusts overall image contrast, that is, increases the brightness difference
between pixels with different intensity values. Range is 0 to 100 with 50 as the
default. The default can be restored at any time by clicking on the small square
above the center of the brightness scale.
Figure 195.
Brightness /
Contrast dialog
box.