[APML] Off Topic: Histogram Help

["siebren klein" <s.s.klein@tue.nl>]

Increase contrast first, Shekhar!
Siebren & Renée Klein
s.s.klein@tue.nl
http://www.geocities.com/siebren2001/index.html

----- Original Message -----
From: "Shekhar Borde" <shekhar@prodigy.net>
To: <astro-photo@seds.org>
Sent: Thursday, February 21, 2002 4:00 AM
Subject: Re: [APML] Off Topic: Histogram Help


: Are all the pixels black or white?  ie., there are no intermediate
grayscale
: values?  If that is true then the histogram in PS should have only two
spikes,
: one at each end of the scale (0 and 255).  Just move your cursor over each
: spike and you should get the readout for the number of black and white
: pixels respectively.
:
: But if you have a grayscale image spanning multiple values in the 0..255
: range then I don't know of a quick or easy way to do it.  Maybe someone
: else might have a better idea.
:
: Shekhar
:
: ----- Original Message -----
: From: "Joseph Celmer" <celstar@frontiernet.net>
: To: "Post Astro-Photo Message" <astro-photo@seds.org>
: Sent: Wednesday, February 20, 2002 5:26 PM
: Subject: [APML] Off Topic: Histogram Help
:
:
: > Dear APML,
: >
: > I have an image which consists of a smattering of black dots of various
: > sizes and shapes on a white background. I am interested in determining
: > the relative % surface area of the black or white to the total area. Is
: > Photoshop or any of the common software capable of expressing this
: > relation in a quantifiable histogram or other manner ( black versus
: > white pixel count perhaps?)
: >
: > Thanks !
: > --
: >
: > Joe Celmer
: > celstar@frontiernet.net
: > http://www.frontiernet.net/~celstar



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