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280 WinView/32 Manual Version 2.4.M
Get/Set Parameters dialog box
See
Diagnostics: Get/Set Parameters dialog box
discussion on page 265.
Hardware LUT dialog box (PentaMAX)
The Hardware LUT dialog box (Figure 243) is opened by clicking on Hardware LUT on
the Acquisition menu. Its purpose is to determine how video will be mapped to a video
monitor display. The selection doesn’t affect the data in any way, but rather only in the
way it is displayed on a video monitor. A brief description of the available selections
follows.
Gamma:
Turns on the gamma function. The function compensates for phosphor non-
linearities. The effect is an overall brightening of the mid-range values in the
picture while decreasing the brightest portions.
Linear:
The 12-bit data are linearly mapped to the 256 gray-scale levels. Pixels with the
lowest intensity value (0) are black. Pixels with the highest intensity value
(4095) are white.
Inverse Linear:
Linear mapping is implemented but with pixels having the lowest
intensities mapped to white and pixels with the highest intensities mapped to
black.
Log:
This option changes the display of the image from linear, where changes in
intensity of the image are mapped equally to the display gray levels, to
logarithmic, where changes in intensity on the dark end are more pronounced.
This is helpful for an image with a very high dynamic range. Since CCD
detectors can have three orders of magnitude more dynamic range than a
computer display, this option can map both faint and bright signals. Once again,
this box does not change any data values in the image, rather it displays the
logarithm of the data.
Inverse Log:
Computes the inverse log for each value and maps the resulting values to
the display.
Square Root:
Computes the square root of each value and maps the resulting values to
the display. Frequently provides a more pleasing display, particularly of darker
detail, of images having a wide dynamic range.
Bit Range 0-64:
Displays the bottom 64 gray levels. Best for very low light level
images.
Figure 243.
Hardware LUT
dialog box.