EDAX EDS Manual

To Create a Stereo Image, page 2
image to red and assign the cyan image and its duplicate to the green and blue channel, then
click 'OK'.
5. An untitled RGB color anaglyph stereo image should now appear on the monitor. Prior to
saving the image, the contrast and brightness should be checked and adjusted if necessary.
This can be done most easily with the "Adjust Levels" procedure which is implemented with a
"Ctrl-L". This will bring up a dialog box that has a histogram and adjustors for black, the
midtone and white. These adjustors are immediately below the histogram and they should be
adjusted to provide an optimum image on the monitor. As a general rule, it probably makes
sense to slide the black adjustor to the beginning of the left side of the histogram, and the
white to end or to the right side of the histogram --this should be approximately equivalent to
clicking on 'Auto'. The image displayed should be updated to reflect these changes --if it has
not, this probably means that the "Preview" box has not been checked. If the resultant image
appears to be too light, then you should move the midtone adjustor to the right. If the image
is too dark, the midtone adjustor should be moved to the left. The midtone adjustment is
most equivalent to the gamma function of the SEM. When you are safisfied with the
appearance of the image, click on 'OK'.
6. To check the 3D image, put the anaglyph glasses on (red for the left eye and cyan for the
right eye) and see if the topography appears normal. If it does, proceed to step 7.
Depending upon how the original images were collected or saved, it may be that the colors
will have to be re-assigned or the glasses reversed. Also, if the tilt axis is not vertical in the
two images as displayed, it may be necessary to do a 90 degree rotation of the image at this
time (click on 'Image' and 'Rotate' and chose a clockwise or a counter-clockwise rotation of
90 degrees.
7. The color stereo image can now be saved by clicking on 'File' and 'Save As...', or by a "Ctrl-
S". The file can be saved in a variety of formats, but the most common are probably the TIFF
or JPEG. If saved as a TIFF, the resulting file will be approximately 1 MB or three times the
size of the original standard definition XL SEM file. If saved as a JPEG with a "High" image
quality setting, the file will probably be about 1/4 to 1/6 of the size of the TIFF depending on
the level of fine detail in the image.
Method II:
1. The two images that will make up the stereo pair should be recalled from disk using the
normal procedure for recalling files (“File”, “Open”, and then selecting the appropriate file
type, directory and file name). In version 4 you can select both images by clicking on the first
one and then a Ctrl - click on the second image from the file list.
2. Convert the higher tilt image (the cyan image) to an RGB color image by clicking on “Image”,
“Mode”, and “RGB Color”. Display the red channel by pressing a “Ctrl – 1”.
3. Activate the lower tilt image by clicking on the image. This image should be converted to a
grayscale image if it is not one already by clicking on “Image”, “Mode”, and “Grayscale”.
4. Select the entire image with a Ctrl - a and then copy it to the clipboard with a Ctrl - c.
5. Re-activate the higher tilt image with its red channel actively displayed, and then paste the
image from the clipboard with a Ctrl - v.
6. Display the entire color image with a Ctrl - ~. At this point you can modify the image and/or
save it to disk just as in steps 5 – 7 in Method I above.
Bob Anderhalt
EDAX Applications Laboratory
June 17, 1999