Re: I need help with calibrating an image using ImageJ
Posted by
HaibaraAi on
Sep 21, 2012; 5:36am
URL: http://imagej.273.s1.nabble.com/I-need-help-with-calibrating-an-image-using-ImageJ-tp4999914p5000150.html
Hi, Wayne!
Thank you for the info, it's exactly what I wanted to know :D But I can't seem to access the sites that you gave me, same with all the sites with ".
nih.gov", are there any alternative links? Thank you! :D
On Thu, Sep 20, 2012 at 1:10 AM, Rasband, Wayne (NIH/NIMH) [E] [via ImageJ]
<[hidden email]> wrote:
On Sep 18, 2012, at 5:55 AM, HaibaraAi wrote:
> Oh i see. But do you know how to adjust the RGB value of the picture? For
> example, the RGB value of the white patch in the ColorChecker chart in the
> photo is currently, 255, 255, 240 but you want to adjust it so that it would
> match its real RGB value of 243, 243, 242. THank you! :D
You can do this using the changeValues() macro function, which is described at
http://imagej.nih.gov/ij/developer/macro/functions.html#changeValues
To change 255,255,240 to 243,243,242, use
changeValues(0xfffff0, 0xfffff0, 0xf3f3f2);
Use an RGB to hex converter, such as the one at
http://www.javascripter.net/faq/rgbtohex.htm
to get the hex values needed by the changeValues() function.
The ImageJ macro language is described at
http://imagej.nih.gov/ij/developer/macro/macros.html
-wayne
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