It is very difficult some times to get the camera lined up with the optical axis, and if you you don't have the right zoom setting or the correct distance from the eyepiece you get alot of vignetting. This image shows some vignetting.
Now to clean this up...
(My comments aree for PhotoShop 5 but they can all be done with the latest PaintShop Pro)
Crop the image to remove most of the vignetting. Then using the levels control, move the input brightness adjustment to the left untill you reach the start of the histogram.
Then convert the image to grey scale.
Use the filter in the noise section called "Dust & Scratches" experiment with the settings untill you remove most of the speckles.
At this point you may have the image you want, but in this case it was still too noisey. So to improve it further. Duplicate the layer in the layers menu. Make the layer have a transparency of 50%. Then (on this new layer) do a gaussian blur with a radius of about 1 to 3 (experiment to get the best one), now flatten the image (merge the layers) This when saved is the final image. A little tweeking with the contrast, may help to make it look sharper. Also reducing the image size often helps. I also did a bit of dodging in the corners to remove the remaining vignetting.
I hope the above helps.
| Maintained by Michael Oates
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Last modified January 17, 2005