Re: Mapping colours in DensityPlot
- To: mathgroup at smc.vnet.net
- Subject: [mg104183] Re: [mg104139] Mapping colours in DensityPlot
- From: Mark McClure <mcmcclur at unca.edu>
- Date: Thu, 22 Oct 2009 02:18:50 -0400 (EDT)
- References: <200910211027.GAA19897@smc.vnet.net>
On Wed, Oct 21, 2009 at 6:27 AM, SeekUp <seek.up.girl at gmail.com> wrote:
> I am using the following command to do a DensityPlot in
> grayscale. The grayscale range is from 0-255, but I need
> to map my function to a grey-level maximum of 200. How do
> I define a new GrayLevel with a max gray level of 200?
I'm not quite clear what you mean when you say that the
"grayscale range is from 0-255". In fact, all arguments
to the ColorFunction will automatically be scaled to be
between 0 and 1. This is good, since that's what GrayLevel
expects. Do you want to darken your picture so that the
lightest region has shade GrayLevel[200/255]? If so, try
this:
cf[c_] = GrayLevel[200*c/255];
DensityPlot[Exp[-(x^2 + y^2)], {x, -2, 2}, {y, -2, 2},
ColorFunction -> cf]
Hope that helps,
Mark McClure
- References:
- Mapping colours in DensityPlot
- From: "SeekUp" <seek.up.girl@gmail.com>
- Mapping colours in DensityPlot