[UW-GIS-L] stretching a hillshade

[Harvey Greenberg]

Even I was weaned away from that approach about ten years ago.  I 
never checked to see if it works any better than the newer method 
of putting transparent color over the hillshade, but arcmap sure 
makes life easier.  When you bring the hillshade into arcmap, you 
can choose the histogram equalize option for stretch in the 
symbology menu, and you can reshape the curve as you please.  If 
my explanation isn't clear, I can show you.

harvey

On 9/16/2011 1:18 PM, Elizabeth Barnett wrote:

> Hi Harvey

>

> Thanks-- I'm making a val grid that gets integrated with  hue 

> and sat grids, which all three turn into a tiff image. So, to 

> make the val grid, I sliced the hillshade 1-255 to 0-99. I used 

> the equal area option (in ArcMap, you can use natural breaks, 

> which seems like it would work better, but this option doesn't 

> exist in ArcINFO) in hopes that the values wouldn't bunch at the 

> ends like they might in equal interval. Maybe I'm thinking about 

> this incorrectly. I suppose the easy way is to monkey with the 

> display when I import it into ArcMap and then create the final 

> image.

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	Harvey Greenberg
	University of Washington
	Department of Earth and Space Sciences
         College of the Environment
	Box 351310
	Seattle WA 98195-1310