Re: AN interesting comment.

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Angus Dorbie (dorbie++at++bitch.reading.sgi.com)
Fri, 17 Jan 1997 18:50:39 +0000

On Jan 17, 9:51am, Rob Jenkins wrote:

> http://www.math.gatech.edu/~tpan/rectangles.html
>

I know this is a Mach effect but is it the proverbial Mach banding?
I have heard it called this before but always had an uncomfortable
doubt.

The images in the URL show this Mach effect:

              ____________ __________
| /
| /
| |
| |
| /
______________| _________/

 actual intensity perceived intensity

And I thought Mach banding was:
                                          __
      ____________ / \_________
     / /
    / /
   / /
  / /
 / /
/ /
 actual intensity perceived intensity

Graph axes guide:

(intensity)
^
|
|
|
-------> (space)

Hence a percieved intensity band where none exists, often seen in
graphics when intensity gets clamped to a maximum value.

Any takers for this Fridays pub trivia question? I think Foley van Damn
is where I remember these graphs from but my copy is at home.

Cheers,
Angus.
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