Graphics Programs Reference
In-Depth Information
3.
Drag the grip up and to the right, and then click a point. The image adjusts to the new
b ou nd a r y.
In addition to hiding portions of a raster image that are unimportant to you, clipping an
image file reduces the amount of RAM the raster image uses during your editing session.
AutoCAD loads only the visible portion of the image into RAM and ignores the rest.
Adjusting Brightness, Contrast, and Fade
AutoCAD offers a tool that enables you to adjust the brightness, contrast, and strength of
a raster image. Try making some adjustments to the raster image of the utility room in the
following exercise:
1.
Click the edge of the raster image.
2.
In the Properties Inspector palette, navigate to the Image Adjust options. Drag the Fade
slider to the right so that it's near the middle of the slider scale. The sample image fades to
the AutoCAD background color as you move the slider.
3.
Press the Esc key to un-select the raster image.
4.
Save the file as Rasterimport.dwg.
You can adjust the brightness and contrast by using the other two sliders in the Adjust
options of the Properties Inspector palette.
By using the Image tab in conjunction with image clipping, you can create special effects.
Figure 13.5 shows an aerial view of downtown San Francisco with labels. This view consists of
two copies of the same raster image. One copy serves as a background, which was lightened
using this exercise. The second copy is the darker area of the image with a roughly triangular
clip boundary applied. You might use this technique to bring focus to a particular area of a
drawing you're preparing for a presentation.
If the draw order of objects is incorrect after you open a file or perform a Pan or Zoom, enter
RE
↵ to recover the correct draw-order view.
FIGURE 13.5
Two copies of the
same image can
be combined to
emphasize a por-
tion of the drawing.
Transamerica Pyramid
Hyatt Regency
