| fun with nonlinearity and COLORBAR [message #72965] |
Thu, 21 October 2010 12:20  |
Jeremy Bailin
Messages: 618
Registered: April 2008
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Senior Member |
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I'm looking for advice on a plot I'm making that uses David's COLORBAR
routine. The problem is that the mapping between color index in the
image and data value is quite non-linear - and not a simple
transformation, either (it's generated via histogram equalization).
There are a few ways I can imagine having it look. So first, from an
aesthetics (and ease-of-understanding) standpoint, which would be
best?
1. The colorbar has one line for each color index, and is annotated
using 6 evenly-spaced divisions, but the numbers marking those
divisions are not evenly distributed.
2. The colorbar has one line for each color index, the annotations
are evenly spaced in *value*, but are spaced unevenly along the color
bar.
3. The colorbar is annotated using 6 evenly-spaced divisions that
have evenly-spaced numbers, and the colors within the color bar vary
(i.e. the mapping between row up the color bar and color index is no
longer linear).
The second question is implementation. I can achieve #1 very easily
using COLORBAR. I think that in order to do #2, I would need to
essentially roll my own version of COLORBAR that changes the
annotation locations - are there any shortcuts that would let me use
the existing routine? To do #3, my best idea is to regenerate a new
(non-linearly altered) color table, and then use the existing COLORBAR
routine. Any caveats with that, or any easier ways to do it?
Alternatively, what other ideas do people have for conveying this kind
of information?
-Jeremy.
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