HDevelop User's Manual

34 CHAPTER 2. GRAPHICAL USER INTERFACE
Figure 2.19: Settings of parameter ÔÒ.
ÁÒØÖØÚººº you specify a rectangular part in the graphics window interactively.
For this, you press the left mouse button to indicate the rectangle’s upper
left corner. Hold the button and drag the mouse to the lower right corner’s position.
Release the button and correct the size by grabbing the borders or corners of the
rectangle. By pressing the right mouse button inside your specified rectangle you
display the objects inside the rectangle in the graphics window.
You also have the possibility to enter the coordinates of the desired clipping manually.
In order to do so you have to specify the coordinates of the upper left corner
and the lower right corner in the respective text fields.
Below the coordinates of the rectangle you see its center. This center can also be
specified interactively using the button ÁÒØÖØÚººº. Activating this mode,
you first have to click with the left button into the active graphics window. Now you
can correct this position by again pressing the left mouse button. To quit, press the
right mouse button.
The buttons ÓÓÑ ÇÙØ and ÓÓÑ ÁÒ activate a zooming with factor 2 or 0.5, respectively.
To get the image’s full view back on your graphics window you simply click the
checkbox Ê×Ø.
Î×ÙÐÞØÓÒ º ËØ ÈÖÑØÖ׺ºº º ÄÙØ
Using ÄÙØ you are able to load different look-up-tables for visualization (see figure
2.21). With the help of a false color presentation you often get a better impression
of the gray values of an image. In the case of a true color display the image has to
be redisplayed due to the missing support of a look-up-table in the graphics hardware.
For color images only the gray look-up-tables can be used, which change each
channel (separately) with the same table.
HDevelop / 2000-11-16