Overhaul m-files in image directory to provide better support for images stored as integers. * NEWS: Add note about overhaul of image scripts to support integer classes. * brighten.m: Add demo. * colormap.m: Better input validation. * contrast.m: Re-position window in demo. * gray2ind.m: Redo docstring. Match variables in docstring to function prototype. Better input validation. Return integer class outputs as Matlab does. Add %!tests. * hsv2rgb.m: Add to docstring. Better input validation. Redo algorithm to get rido of obsolete matrix-fill methods like kron(). Add %!tests. * image.m: Redo docstring. Match variables in docstring to function prototype. Better input validation without using for loops. * imagesc.m: Redo docstring. Match variables in docstring to function prototype. Remove DEPRECATEDZOOM functionality. Add demos. * imfinfo.m: Redo docstring. * ind2gray.m: Redo docstring. Match variables in docstring to function prototype. Redo algorithm to directly calculate luminance value rather than getting it from rgb2ntsc. Add %!tests. * ind2rgb.m: Redo docstring. Better input validation. Add some %!tests. * ntsc2rgb.m: Redo docstring. Better input validation. Add %!tests. * rgb2hsv.m: Better input validation. Add %!tests. * rgb2ind.m: Better input validation. Code algorithm in cleaner method for ease of understanding. * rgb2ntsc.m: Redo docstring: Better input validation. Add some %!tests.

--- a/scripts/image/contrast.m
+++ b/scripts/image/contrast.m
@@ -48,13 +48,13 @@
 
 
 %!demo
-%! clf;
+%! figure;
 %! img = reshape (1:100, 10, 10);
 %! imagesc (img);
 %! colormap (gray (64));
 %! title ("Image with default 64 gray levels");
 %! pos = get (gcf, "position");
-%! pos(1) += pos(3) + 15;
+%! pos(1) += pos(3) + 25;
 %! figure ("position", pos); 
 %! colormap (contrast (img, 10));
 %! imagesc (img);