The question may be 20 "what?" on your image.

Depending of your software and the kind of color you choose, it can be counted 
in percent or in 0-255 scale.

What I did when I encountered the same problem was setting the terrain in 
world, saving the height map and checking the value. If I remember well, 
20meters ended up to be something around 16% grey (which does not find any of 
the two hypothesis above)

I didn't have the curiosity to match the result with OpenSim settings about 
minimum and maximum terrain height. This could be the clue.

--
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Le 6 mai 2012 à 16:00, Len W. Brown a écrit :

> Ah yes, thanks for the trip down memory lane!  I remember seeing that over a 
> year back while still pretty active in Second Life.
> 
> Although it hasn't been updated since August of last year, it has helped 
> answer a few of my other questions, however, on the page I am reminded that I 
> continue to be doing something wrong, or else Second Life's servers are 
> better calibrated, because I am reading:
> 
> Remember that the water level has a default elevation of 20 meters (with a 
> corresponding gray value of 20), and that an estate owner can change this 
> setting in-world.
> 
> And while this is my objective, the actual height I'm getting in-world is not 
> accurate.  Unless maybe by using PNG rather than importing a RAW-generated 
> terrain that is where my trouble stems maybe?
> 
> Thanks again!
> 
> On 05/06/2012 08:23, R.Gunther wrote:
> 
>> Not sure if you found this one.  But here you can find lots of info about 
>> Secondlife heightmaps.
>> http://wiki.secondlife.com/wiki/Tips_for_Creating_Heightfields_and_Details_on_Terrain_RAW_Files
>> 
>> On 2012-05-06 15:04, Len W. Brown wrote:
>>> 
>>>  
>>> Hi everyone!  Google and OpenSimulator.org haven't provided me a really 
>>> clear direct answer to this question (yet)...
>>> 
>>> I am attempting to create a very crisp heightmap for a tech-based region 
>>> I'm planning where certain areas must be at precise elevations.  I'm trying 
>>> to choose precise grayscale colors that result in precise elevations.
>>> 
>>> I'm having a hard time determining what settings to choose.
>>> 
>>> I'm using GiMP and have made multiple attempts this morning creating an 
>>> image 256X256, grayscale, set to total black and saved as a PNG with zero 
>>> compression.  But when loading in the console ("terrain load 0.png" for 
>>> example) while it loads "successfully" what I wind up with is a flat 
>>> terrain that is approximately 12.25 meters in elevation.  Not the 0 meters 
>>> I expected.
>>> 
>>> Doing the same as above, but setting the grayscale to 20 on a new image, I 
>>> expected it to load at sealevel.  Instead it loaded at about 25.75 meters 
>>> elevation.
>>> 
>>> I would sincerely appreciate a clear options setting for elevation if this 
>>> is actually supported with precision in OpenSim 0.7.3.1...  Thanks!
>>> 
>>> -- 
>>> 
>>> - Len W. Brown
>>>      [email protected]
>>> 
>>> 
>>> _______________________________________________
>>> Opensim-users mailing list
>>> [email protected]
>>> https://lists.berlios.de/mailman/listinfo/opensim-users
> -- 
> 
> - Len W. Brown
>      [email protected]
>      www.lenwbrown.com
> _______________________________________________
> Opensim-users mailing list
> [email protected]
> https://lists.berlios.de/mailman/listinfo/opensim-users

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