Re: [APML] more LRGB madness

[Joe Pedit <pedit@email.unc.edu>]

> Tony Hallas wrote:
>
> Take any regular RGB color shot... make it something that has a fair
> amount of detail and range in it... look at the histogram. If it is
> typical, the histogram will go across a fair amount of the graph.
> 
>     Now either convert it to grayscale or go to saturation and delete
> all the color information out of it... now look at the histogram... it
> SHRANK!
> 

Tony,
I tried your experiment with your Lagoon image
<http://astrophoto.com/Lagoon.htm>.  My results are at
<http://www.unc.edu/~pedit/lagoonboth.jpg>.  The luminosity histogram
for the color image is on the left and the histogram for the gray scale
image is on the right.  They look the same to me and the statistics are
roughly equal.  What am I missing?
Joe

--  APML Archives at <http://astro.umsystem.edu/apml/>  ---
             Unsubscribe at <majordomo@seds.org>