[GRASSLIST:1486] Re: photoshop,GRASS, and Landsat

[Ian Macmillan]

Aw shoot, turns out I had a typo in my script.  Those always seem to turn up at
the wrong times ;>  All is well now.

-ian

> Hi all, I am wondering if anybody out there has experienced this problem.  I
> have gotten ahold of some Landsat data, and imported it into GRASS, no prob. 
> I
> have displayed bands 3,2,1 as RGB, but the histograms are all screwy, so the
> images look very ugly (not uncommon for Landsat).  I displayed the
> histograms
> and then rescaled the rasters (r.rescale) so that the curve was more
> appropriate.  However the image I get is still not very realistic looking. 
> When i performed the same operation in Photoshop (using adjust levels) with
> the
> same histogram rescaling, the image looks very nice.  I was able to compare
> on
> screen the two images in GRASS and Photoshop, and made sure that their
> histograms matched.  However the Photoshop image looked much better
> (specifically, the reds came out better).  The links below should show what I
> am
> talking about.
> 
> http://www.uweb.ucsb.edu/~ian_macmillan/p15r53_Photoshop.jpg
> http://www.uweb.ucsb.edu/~ian_macmillan/p15r53_GRASS.jpg
> 
> Anyone out there dealt with this?
> 
> Thanks, Ian
> 
> 


-----------------------------------------------------
Ian MacMillan
Geological Sciences-UCSB