In the false color image,
"Black" corresponds pixels with a small number of counts and "White" to pixels with a
large number of counts, with a range of hues in between. You can change the
maximum and minimum values (white and black) by dragging
the two sliders to the right or left, or by entering in the desired values in the
boxes to the left of the sliders.
Buttons just below the slider allows you to change the nature of the color scale. If set to Linear (default), the color scale is linear with the counts/pixel from the smallest to the largest. If it is changed to Logarithmic, the color is proportional to the logarithm of the intensity. The "Color Scheme" drop-down menu allows you to specify the rainbow of colors on going from black to white--more red, more green, etc. Each choice corresponds to a different color. The last two options are black-and-white only, which may be useful if the image will ultimately output to a black/white printer. "White/Black" produces an image similar to the previous ones, with whiter pixels corresponding to more intensity. "Black/White" produces an inverted image, with blacker pixels corresponding to more intensity-this one looks very much like old- fashioned photographic film. The Contour button provides an alternate way of displaying the data, replacing the false color display controlled by the color scale and color scheme. Constant intensity contours are drawn at selected intensity levels. The resulting image can be zoomed or written to a file in the normal way. Clicking on the Contour button switches from Linear or Logarithmic mode to contour mode. The default is a set of logarithmically spaced contour lines. The number of contours, intensity value for each contour, and color of each contour line can be altered in a new window that is opened using the Levels button. The contours will be immediately redrawn if you click the Apply button, assuming that you have already clicked the Contour button--otherwise, the changes will take effect the next time you go into contour mode. If you decide to play with the contour levels and/or colors, keep the following in mind:
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