"Steve Eddins" wrote in message <firstname.lastname@example.org>... > On 10/19/2012 5:25 AM, Nicolás wrote: > > Good morning. > > I am trying to use imwrite to save a image with a colormap( for example, > > 'jet'), and with a value of 25 levels, such as this: > > imwrite(handles.image,handles.colorMap,filename,pathname); > > > > However, the image is not saved with the value of levels established > > previously. Thus the image is saved with a value of 256 leves, instead > > of 25. > > > > Anyone knows do it? > > Thanks in advance. > > The same question came in from a MathWorks training engineer this week. > > You didn't say what file format you are using, but I'll assume you are > writing a TIFF file. > > In the TIFF file format spec, it says that the number of colors in the > colormap is 2^n, where n is the number of bits per sample. (For > details, see section 5, "Palette-color images," of the TIFF spec. > http://partners.adobe.com/public/developer/en/tiff/TIFF6.pdf) > > So it is not possible to make a TIFF file that has a colormap with only > 25 colors in it. > > -- > Steve Eddins > http://blogs.mathworks.com/steve/
Sorry, but the file format can be jpeg,jpeg 2000,gif,etc,etc, in summary those supported by Matlab. And another thing. I don't want to save the level of color. What I want to save is the level of intensitiy. When you have a image, you have from 0 to 255 levels of intensity. I want to modify the colormap of the image and then, modifying the level of intensity.