IR images index scale not linear and disjunct help?!

Posted by terin on Nov 28, 2009; 2:11am
URL: http://imagej.273.s1.nabble.com/IR-images-index-scale-not-linear-and-disjunct-help-tp3690302.html

Hi- I used a NEC IR camera to take some images I would like analyze for mean, min, and max temperatures in different areas. While I had access to the camera's software (thermography studio) I saved all images as BMP with a color temperature scale in the corner. I thought that this would enable me to analyze the images using imagej. Yet I am having trouble with the relationship between the index value and the temperature scale. When I make a profile plot of the scale bar the plot is almost linear except at very high temperatures when the index values drop to low values again (attached?). I can't seem to get rid of this disjunct pattern no matter what I try and some of the areas within my images I need to analyze fall within the non-linear portion of this relationship. Any advice or help would be much appreciated. thank you profile+plot