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<title>Blink Images/Graphs</title>
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<h1>Blink Images/Graphs</h1>
Within POW, multiple images can be examined for differences by the
common technique of overlaying them and blinking them in rapid
succession. Pow provides two methods for doing this.
<h2>Blink Images...</h2>
Multiple images can be placed within a single POW graph. This can be
achieved by merging the contents of several graphs into a single one
(via POW's Merge Graphs or Edit Graphs menu items), or, if the data is
part of a 3-D data cube, by using an outside tool (eg, fv) to produce
a graph with each 2-D slice of the cube treated as a separate image.
After the graph containing all the desired images has been created and
selected, select <B>Blink Images</B> from the <a href="Edit.html">Edit
menu</A>. A dialog box containing information about the current graph
and controls for the blinking behavior will be displayed. <p>
At the top of the dialog box is the name of the selected graph
followed by the number of images in the graph and the image number
currently in the foreground. The <B>Prev</B> and <B>Next</B> buttons
immediately below this information step through the images, bringing
each one to the foreground in turn. It is possible to either blink
all the images in order or in a specified sequence. The <B>Add to
List</B> button appends to this sequence list the image currently in
the foreground. The sequence <B>List</B> entry box consists of a
comma-separated list of image numbers and/or ranges (e.g.,
1-3,5,8-10,14). A pair of radio buttons determines with the sequence
list is used or all the images are blinked in order. Two checkbuttons
control whether blinking is <B>Loop</B>ed--repeated indefinitely--or
stopped after the last image is displayed, or blinked in
<B>Reverse</B> order. A slidebar controls the <B>Speed</B> at which
blinking occurs. All these controls can be
modified while images are being blinked and will take effect
immediately. To have a new list of frames take effect, though, one must
reselect the <B>List</B> radio button. <P>
When the controls are set to their desired values, press the <B>Blink
Images</B> button to begin blinking. The button changes to <B>Stop
Blinking</B>. <P>
If the selected graph is changed while the dialog box is open, press
the <B>Reload Info</B> button to update the dialog with the new
information.<P>
<h2>Blink Graphs...</h2>
It is not always possible to put all one's images into a single
graph--images may lack a common
coordinate system for automatic alignment--preventing the previous
blinking method from being used. The <B>Blink Graphs</B> menu item
allows individual graphs to be blinked. There is no "natural order"
with which to blink graphs, so the user is presented with a list of
all <B>Available Graphs</B> and must specify which graphs to blink and
in which order. The <B>Add</B> and <B>Insert</B> buttons append to
the end or insert at the current selection point of the <B>Blink
Order</B> list the highlighted graphs from the Available Graphs list.
A graph may appear multiple times in the Blink Order list. The
<B>Delete</B> button removes all highlighted entries from the Blink
Order list. As in the Blink Images method, a slidebar controls the
speed of the blinking. <P>
Blink begins when the <B>Blink Graphs</B> button is
pressed. Blinking is always in the specified order (no reverse
option) and will repeat indefinitely until the <B>Stop Blinking</B>
button (same as the Blink Graphs button) is pressed. <P>
As graphs normally don't initially overlap and will likely need to be
repositioned, the graphs in the Blink Order list can be moved from
within the dialog box. A compass labeled <B>Shift & Align
Graphs</B> is present in the center of the dialog box. Clicking on
the center of the compass aligns all the graphs in the list according
to the top right corner of the first graph. Clicking on any of the
arrows shifts the highlighted graphs 10 pixels in that direction.
Shift-clicking an arrow shifts the graphs 1 pixel at a time. The
graphs continue to move in these increments until the mouse button is
released or the cursor leaves the compass arrow. (Note: if an
individual graph is present several times in the Blink Order list,
each instance of it in the highlighted selection will experience the
shift.) Graphs can be repositioned with the compass while
blinking. <P>
If graphs are added to the POW canvas while the dialog box is open,
press the <B>Reload Info</B> button to create a new list of Available
Graphs.<P>
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