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

Posted by David Webster on Feb 08, 2010; 11:47pm
URL: http://imagej.273.s1.nabble.com/New-User-ImageJ-use-with-Sea-Surface-Temperature-Images-tp3689433p3689439.html

Hmm! Didn't think about the psuedo color as I assumed a scalar temperature
was the real variable. So, a conversion is needed if the scalar temp images
aren't available.

David Webster

On Mon, Feb 8, 2010 at 1:59 PM, Gabriel Landini <[hidden email]>wrote:

> 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.
>
>