Histogram draws a simple histogram of a slice of a data set. It plots
number of occurrences of a small range of data values. It can also draw
a histogram of the whole data set. It is often used to limit the palette
of a part of a data set in order to bring out more detail within a small
range of data values.
Controls
Buttons
RGB mode produces three separate histograms for three different slices
of the same data set. Image is currently the only RGB application.
Track mode (green is on) sends updates to any application to which it
is linked every time histogram's slider moves. Send sends out such updates
when pushed.
Save saves histogram data to a file called histo.txt.
Slider
The two beads on the slider below the plot control the location of the
two yellow limit lines. They start at the ends of the data range. (The
rightmost one can be seen in the picture above.) Moving the slider causes
the creating of a new color palette placing the same colors as the original
palette within a smaller range, defined by the region between the two limit
lines. Data values outside of the limit lines will be given colors equal
to the closest end value by default.
Thumb Wheel
The thumb wheel scales the display. Double-click on it to reset to the
original value.
Menu
Clamp to Grey/Edges allows one to change the colors outside of the limit
lines, either to grey or to the end colors of palette.
Full Data Set Histogram causes the histogram to be of the entire data
set; Slice Only Histogram causes only the current slice to be used.
1% Levels Mode moves the sliders so that at most 1% of the data is outside
the limits on each end. When this is on, the sliders will track the edges
of the data.
Applications to Connect to This Application
Any Data Object may be connected via the
"drag 'n drop" button to this application. ColorTool
will give Histogram a new palette. Any application with a bounding
box (e.g. Image) will cause the
data within the bounding box to be considered without consideration of
any other data.
Sliders control the slice considered.
RGBSlider is used in RGB mode.
Applications to Link This Application to
Any application which uses a color palette can have the palette limited
by Histogram.
Tricks and Gotchas
Currently existent histo.txt files will be overwritten by Save.
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/ Oct 5, 2001
