How to apply color palette to a grayscale image

[RDalmagro]

Hi
I am working with satellite images (an 8-bit grayscale TIFF file), and I am trying to apply it a color palette using IM. The problem is that I need to set a color different ranges of values, for example red for value between 35-65 and blue between 70-75.
I would like some help about this.
Thanks

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http://www.realvirtual.com.mx

[snibgo]

One way of doing this is to make a CLUT (colour look-up table), which can then be used for many source images. Windows BAT syntax:

Code: Select all

convert ^
  -size 1x256 gradient: -rotate 90 ^
  -fx "u>=35/255&&u<=65/255?red:u" ^
  -fx "u>=70/255&&u<=75/255?blue:u" ^
  clutfile.png

Then each image can be processed:

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convert in.tiff clutfile.png -clut out.tiff