Re: RGB Imaging

Posted by Michael Schmid on Feb 04, 2010; 9:02am
URL: http://imagej.273.s1.nabble.com/RGB-Imaging-tp3689504p3689505.html

Hi Julian,

just read the documentation to get a few ideas what could be done:

Image>Color>Split Channels
Analyze>Histogram for each of the channels

or

Image>Type>HSB stack
Analyze>Histogram for each of the stack slices.
Especially the hue slice will be of interest to detect a change of  
hue (see http://en.wikipedia.org/wiki/HSV_color_space if you are not  
familiar with HSB)

Of course, an equally important problem is having reproducible  
conditions when taking the photographs (equal illumination, fixed  
white balance of the camera).

Michael
________________________________________________________________

On 4 Feb 2010, at 08:05, jspecs wrote:

> Hello,
> I am doing a research project on how pumice rocks change color with  
> varying
> amounts of heat. My findings thus far are that as rocks are exposed to
> higher temperatures, they oxidize and turn darker and darker shades  
> of red.
>
> I am attempting to quantify my data using Image J. I want to be  
> able to
> upload my digital images of the rocks into the program, convert my  
> images
> into RGB images and then determine the mean occurrence of red,  
> green, and
> blue in each image (potentially with color histograms?). My  
> ultimate goal is
> to quantitatively represent the color change occurring as the rocks  
> change
> color with heat by determining the amount of red, green, and blue  
> in each
> image.
>
> Is this possible with this program? Any help would be much  
> appreciated.