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# grayish

## (Toolbox/grayish.m in BrainStorm 2.0 (Alpha))

### Function Synopsis

    cmap = grayish(cmap,minval);

### Help Text

    GRAYISH - % gray out the lower end of a spectrum for less severe palette
     function cmap = grayish(cmap,minval);
     assumes standard two-dimensional color map of three columns

### Cross-Reference Information

This function is called by

    bst_imaging_display                C:\BrainStorm_2001\Toolbox\bst_imaging_display.m

### Listing of function C:\BrainStorm_2001\Toolbox\grayish.m

    function cmap = grayish(cmap,minval);
    %GRAYISH - % gray out the lower end of a spectrum for less severe palette
    % function cmap = grayish(cmap,minval);
    % assumes standard two-dimensional color map of three columns

    %<autobegin> ---------------------- 26-May-2004 11:30:21 -----------------------
    % --------- Automatically Generated Comments Block Using AUTO_COMMENTS ---------
    %
    % CATEGORY: Utility - General
    %
    % At Check-in: $Author: Mosher $  $Revision: 12 $  $Date: 5/26/04 9:59a $
    %
    % This software is part of BrainStorm Toolbox Version 2.0 (Alpha) 24-May-2004
    %
    % Principal Investigators and Developers:
    % ** Richard M. Leahy, PhD, Signal & Image Processing Institute,
    %    University of Southern California, Los Angeles, CA
    % ** John C. Mosher, PhD, Biophysics Group,
    %    Los Alamos National Laboratory, Los Alamos, NM
    % ** Sylvain Baillet, PhD, Cognitive Neuroscience & Brain Imaging Laboratory,
    %    CNRS, Hopital de la Salpetriere, Paris, France
    %
    % See BrainStorm website at http://neuroimage.usc.edu for further information.
    %
    % Copyright (c) 2004 BrainStorm by the University of Southern California
    % This software distributed  under the terms of the GNU General Public License
    % as published by the Free Software Foundation. Further details on the GPL
    % license can be found at http://www.gnu.org/copyleft/gpl.html .
    %
    % FOR RESEARCH PURPOSES ONLY. THE SOFTWARE IS PROVIDED "AS IS," AND THE
    % UNIVERSITY OF SOUTHERN CALIFORNIA AND ITS COLLABORATORS DO NOT MAKE ANY
    % WARRANTY, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO WARRANTIES OF
    % MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, NOR DO THEY ASSUME ANY
    % LIABILITY OR RESPONSIBILITY FOR THE USE OF THIS SOFTWARE.
    %<autoend> ------------------------ 26-May-2004 11:30:21 -----------------------

    [m,n] = size(cmap);

    if(length(minval) == 1),
      minval = minval + zeros(1,3);
    end

    for i = 1:3,
     cmap(:,i) = max(cmap(:,i),minval(i)); % set threshold
    end

    startndx = 0; % looking for highest index
    for i = 1:3,
      startndx = max(startndx,min(find(cmap(:,1) > minval(i))));
    end

    % so color above this are above the minval

    cmap = cmap(startndx:end,:); % only those values

    % now rescale to full range by interpolating
    mtrunc = size(cmap,1); % new length
    ndx = [0:(mtrunc-1)]/(mtrunc-1)*(m-1); % scales to new range

    cmap = interp1(ndx,cmap,[0:(m-1)]);

    return

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