KEYWORD
     Scale GrDisRange WinGeom MatrixDisplay Step_Inc Interpolation BufferImage ShowImage ShowGraphics ScalingAlgorithm ComplexDataDisOpt WaveSynching ScaleBar Width Color Len Dir Pos

DESCRIPTION Display Attributes
     This program allows you to view and alter many of the
     parameters controlling how images are displayed in an image
     window.  To view or change the default parameters that are
     used, use Priism's "Preferences" dialog.

Scale
     The values in this field are the parameters used to scale the
     data for display.  The first is the minimum value for the
     scale, the second is the maximum value, the third is the
     exponent, and the fourth is a flag that when equal to one
     specifies that points above the maximum value be drawn
     with the minimum intensity.

GrDisRange
     When an image window displays a section of data, the graphics
     from nearby z slices and time points can be included in the
     display.  Let f1, f2, f3, and f4 be the four values shown
     in the "GrDisRange" field.  Then the section with z index,
     z0, and time point index, t0, will include the graphics
     from sections whose z index is between z0 minus f1 and z0
     plus f2 and whose time point index is between t0 minus f3
     and t0 plus f4.

WinGeom
     You can alter any of the values here to modify the window's
     geometry.  The first two values in this field specify the x
     and y position of the lower lefthand corner of the monitor
     window, in pixels, as measured from the lower lefthand corner
     of the screen.  The third and fourth values specify the width
     and height in pixels of the image window (including the
     associated menus and borders).

MatrixDisplay
     Use this field to split up the window into multiple images.
     The two numbers in this field set the number of columns and
     rows respectively.  The images are displayed in order of
     increasing index from left to right and from bottom to top.

Step_Inc
     This field sets the number of sections skipped when moving
     to the next or previous section.

Interpolation
     When on, enlarged images (zoom greater than one) are
     displayed using a bilinear interpolation.  Otherwise, no
     interpolation is applied and a pixel value from the unenlarged
     image is used unmodified for a square set of pixels in the
     enlarged version.

BufferImage
     When on, the data after scaling is stored to save time if
     the image needs to be redisplayed.  To reduce the amount of
     memory used, you can turn off the buffering of the scaled data.

ShowImage
     When off, images are not shown in the window.  This can be
     useful if you just want to see the overlayed graphics.
     Typically, however, you will want the image display to be
     switched on.

ShowGraphics
     When off, any graphics overlayed on the image are not shown
     (with the exception of the section number display).
     Typically, you will want the graphics switched on.

ScalingAlgorithm
     Two choices of scaling algorithm are offered.  The "Fast"
     option uses a lookup table to speed the scaling process with
     the drawback that it becomes increasingly inaccurate for
     scaling floating point or complex data as the scaling
     exponent gets farther away from one.  The "Accurate"
     option takes roughly twice as much time but accurately does
     the scaling in nonlinear cases.  Generally, the "Fast"
     option is reasonable for most work.

ComplexDataDisOpt
     When displaying complex data, the quantity displayed as an
     image intensity can be the real component, the imaginary
     component, the magnitude, or the phase (in radians) of the
     complex number.  This menu allows you to select which of these
     options is used.

WaveSynching
     This menu gives you control over which section is displayed
     when you switch waves after changing the section displayed.
     With "Same Z Section", when you change waves the z and time
     index of the data shown will not change:  the different waves
     remain in sync.  With "Independent", when you change waves
     the data displayed will be the data that was last displayed for
     that wave:  scrolling through the data in one wave has no effect
     on the section that will be displayed after you switch to
     displaying another wave.   With "Coupled", when you step
     forward in one wave, you will also step forward.  This behavior
     is similar to what happens with "Same Z Section"; the difference
     is that the "Coupled" option doesn't force the z and time
     index to be the same when waves are switched.

ScaleBar
     Use this to control whether or not the scale bar, a line to
     indicate the physical dimensions of the image, is shown.
     The "Label" option currently just has the same effect as "On".

Width
     This entry specifies the thickness of the scale bar in pixels.

Color
     Use this menu to select the color of the scale bar.  The color
     options can be changed by using ChangeColors.

Length
     This field sets the length of the scale bar in terms of the
     physical units for dimensions the data set, i.e. angstroms for
     electron microscope data and microns for optical microscope data.

Direction
     Toggles whether the scale bar is shown horizontally or vertically.

Position
     This field sets the x and y position of the scale bar, in
     pixels, as measured from the lower lefthand corner of the image
     window.  For horizontal scale bars, this position is the center
     of the left edge of the scale bar; for vertical scale bars, this
     position is the middle of the bottom edge of the scale bar.

     You can select the position of the scale bar by pressing the
     "Select with Mouse" button and then clicking on the desired
     position in the image window with the right mouse button.