[scilab-Users] converting matrix to image

[Samuel Gougeon]

Hi Robert,

----- Message d'origine -----
De : Robert Fong
Date : 05/04/2010 07:12:
> Hi,
> I would like to convert a matrix of floating point numbers 
> (representing gray scale) to an image file such as a jpg file, that 
> can be displayed as am image. Matlab does this with the "image" 
> function. Does Scilab have a similar function? If not does anyone have 
> any a way to accomplish this?
It is possible to display a real matrix as an image with Matplot or
Matplot1 as said before. Here is an example

clf
Ncolors=70; //  Number of colors whished
M=grand(200,200,"uin",0,Ncolors);  // Creating data. Replace by your own real matrix M
RGB=graycolormap(Ncolors+1);	// You can choose another colormap. Here is the grey one.
LUT=addcolor(RGB);	// Mandatory resampling of colors through all colors available in the colormap
Matplot(matrix(LUT(M+1),size(M)))	// Displays the matrix

It is also possible to display the related colorbar in the margin: See 
colorbar()
Once the matrix is displayed, use xs2jpg() or xs2gif() or xs2png... etc
to record the graphic windows into a image file.

Regards
Samuel

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