Re: I need help with calibrating an image using ImageJ
Posted by
Rasband, Wayne (NIH/NIMH) [E] on
Sep 19, 2012; 5:08pm
URL: http://imagej.273.s1.nabble.com/I-need-help-with-calibrating-an-image-using-ImageJ-tp4999914p5000116.html
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#changeValuesTo 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.htmto 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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