Autodesk 00126-050008-1620A - Autocad 2006 Essentials User Manual page 91

Range tab
The Range tab is used to tune the following range methods: Range by Grey, Range
by RGB or Range by HSV.
Colors
This list shows information on the central colors of the specified ranges and allows
you to select a range for correction and deletion. The left part of the list element
shows a sample of a selected color (or grey tone), and the right part shows color
component values in the current color model (grey level for grayscale images). To
select a range, click its appropriate color in the Colors list.
Above there are three buttons with eyedropper bitmaps, these allow you to create
new ranges.
Color selection allows you to create a new range by selecting a color in the
image. Click the button and specify a color on the image with mouse.
WiseImage creates a new range, using the color of the specified pixel as the range
central color.
Averaged color selection allows you to create a new range by choosing an
averaged color in the area around the pixel clicked.
WiseImage calculates the average color value in the area of the specified pixel and
creates a new range, using the calculated color as the range central color. The half-
lengths of the created range are automatically adjusted to take the closest colors,
found in the specified pixel area.
Area averaged color selection allows you to create a new image by
calculating the averaged color of an arbitrary area in the image.
Click the button and specify the vertices of a polygonal area or drag the cursor,
outlining the boundary of the polygonal area. Complete the area selection with a
double-click. WiseImage calculates the average color value in the specified area
and creates a new range, using the calculated color as the range central color. The
half-lengths of the created range are automatically adjusted to close colors, found in
the specified pixel area.
Ranges
Using this box you can change the half-lengths of a range, selected from the Colors
list. The type, name and number of sliders and boxes depend on the current
conversion method. For example, if you choose Range by HSV, the following
sliders and boxes to modify the range half-lengths are displayed: hue– H,
saturation – S and brightness – V.
If you choose Range by Grey, then there is only one slider and one box to enter the
half-length of the brightness range.
7 Binarization and Color Separation
93