The combination of gray-scale images, smoothing and color enhancing can produce different
visual effect, depending on the order in which the color enhancement is applied. The
"smoothing" of images when zoomed uses the Flash library function that interpolates values
to pixels.
For example, here is a zoomed, unsmoothed gray-scale image (the non-gray pixels
are from the background basemap image):
And here is that same image, but smoothed by setting the overlay_smooth
parameter to "true":
If we enhance the un-smoothed gray scale image prior to zooming (or, just
start with a colorized image instead of a gray-scale one), we get:
If we apply the enhancement first and then zoom and smooth the image (which is
also just like starting with a colorized image), we get this:
However, if we zoom and smooth the image and then apply the enhancement, we get:
This last effect is accomplished by setting both the overlay_smooth and
overlay_enhance_table parameters.
If you would like to experiment with this a little more, here is the applet from which
those images were taken.....
Here is a list of the configuration file for this experiment:
