Re: New User - ImageJ use with Sea Surface Temperature Images

Posted by Gabriel Landini on Feb 08, 2010; 9:59pm
URL: http://imagej.273.s1.nabble.com/New-User-ImageJ-use-with-Sea-Surface-Temperature-Images-tp3689433p3689438.html

On Monday 08 February 2010 19:48:37 you wrote:
> On Mon, Feb 8, 2010 at 7:43 AM, D Kelly O'Day wrote:
> > I'm a new ImageJ user interested in analysis of sea surface temperature
> > (sst) images.
[...]
> > How do I go about "subtracting" one image's ssta from another?

> Assuming that they are the same size, just use Process/Image Calculator and
> select the Subtract option.

Hmm... no,  because one cannot apply arithmetic operations between false
colour gif images (which are palette mapped) and expect a sensible result.

You probably need to convert/recalibrate the false colour to greyscale based
on the scale provided and only then do operations between the new images.

Cheers,
G.