Jeff,
Ok, so this is what I was trying to achieve...
c=['#6C9F7B','#783F68','#F4F4F2','#22F322','#F3F322','#0000F3']
mycm=mpl.colors.LinearSegmentedColormap.from_list('mycm',c)
plt.imshow(rand(10,10),cmap=mycm,interpolation='nearest')
colorbar()
plt.show()
That was the initial goal; being able to quickly create the cmap based on
some basic colors.
from there, I can optionally play with the mycm._segmentdata dictionary in
order to fine-tune the color spread.
...the documentation on the 'LinearSegmentedColormap.from_list()' method is
very brief,
and there wasn't an example, so I didn't see it right away...
Anyway, problem solved.
Sorry for the confusion, & thanks again for the help
P.Romero
-----Original Message-----
From: Jeff Whitaker [mailto:jsw...@fastmail.fm]
Sent: 2009-08-14 6:35 PM
To: P.R.
Subject: Re: [Matplotlib-users] colormap creation
P.R. wrote:
> Jeff,
> Thanks for pointing me to that example.
> I was basically manually performing the same operations as those listed in
> the example.
> however, like I said before, its been slow going, since I have to manually
> edit the ranges & adjust 'linear spread' of each color.
> It's a trial & error process...
>
> Im clear on how the rgb dictionary works;
> I guess my problem/question was more on how to automate some of the work
> involved in creating the rgb dictionary.
>
> Example:
> Supposing that I have a rough idea of what color sequence I want,
> let's say,
>
> black
> blue
> yellow
> red
> purple
>
> ... yet Im not sure about the exact values or 'tones' of these colors...
> (this is an arbitrary example, let's assume that a similar cmap doesn't
> already exist in mpl)
>
> - I'd like to have an automatic method to easily create a preliminary,
> 'rough draft' rgb dictionary based on the rgb values for my basic
colors...
> this way, I can quickly create a 'prototype' dictionary that I can then
> modify & adjust to suit my needs.
>
> so, a 'colormap generator' that takes a set of rgb values as input, and
> create the value ranges within the rgb dictionary automatically...
>
> Any ideas?
>
Nope, sorry.
-Jeff
> Thanks,
> P.Romero
>
> -----Original Message-----
> From: Jeff Whitaker [mailto:jsw...@fastmail.fm]
> Sent: 2009-08-14 5:29 PM
> To: P.R.
> Cc: matplotlib-users@lists.sourceforge.net
> Subject: Re: [Matplotlib-users] colormap creation
>
> P.R. wrote:
>
>> Can someone please recommend a (semi) automatic way to create the rgb
>> dictionaries needed for colormap creation?
>> Basically, I have a 'general' idea of how I want my colors ordered, but
Im
>> finding it difficult to create the smooth transitions by manually editing
>> the rgb dictionary for my custom colormap...the trial & error process is
>> tedious & not very accurate...
>>
>> How were the matplotlib colormaps created?
>> Were they created manually or programmatically?
>> Was it done using a random color selection?
>>
>> Please help,
>> Thanks,
>> P.Romero
>>
>>
>
> P.R.: If you haven't already, you should look at the custom_cmap.py
> example.
>
> -Jeff
>
>
--
Jeffrey S. Whitaker Phone : (303)497-6313
Meteorologist FAX : (303)497-6449
NOAA/OAR/PSD R/PSD1 Email : jeffrey.s.whita...@noaa.gov
325 Broadway Office : Skaggs Research Cntr 1D-113
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