Colormap demos?

[Søren Hauberg]

Hi All

I often have problems remembering how different colour maps work ("does
red mean a high or a low value?"), so I'd like to have an easy way of
visualising the maps. If I made a patch adding demos to the various
colour map functions ('jet', 'hsv', ...) that all do something like this

    ## Show the 'hsv' colormap as an image
        image (1:64, linspace (0, 1, 64), repmat (1:64, 64, 1)')
        axis ([1, 64, 0, 1], "ticy", "xy")
        colormap hsv

would such a patch be accepted?

Søren
       

[John W. Eaton-3]

On 21-Oct-2009, Søren Hauberg wrote:

| I often have problems remembering how different colour maps work ("does
| red mean a high or a low value?"), so I'd like to have an easy way of
| visualising the maps. If I made a patch adding demos to the various
| colour map functions ('jet', 'hsv', ...) that all do something like this
|
|     ## Show the 'hsv' colormap as an image
|         image (1:64, linspace (0, 1, 64), repmat (1:64, 64, 1)')
|         axis ([1, 64, 0, 1], "ticy", "xy")
|         colormap hsv
|
| would such a patch be accepted?

I have no objection to additional graphics demos.

jwe

[Søren Hauberg]

ons, 21 10 2009 kl. 16:58 -0400, skrev John W. Eaton:

> On 21-Oct-2009, Søren Hauberg wrote:
>
> | I often have problems remembering how different colour maps work ("does
> | red mean a high or a low value?"), so I'd like to have an easy way of
> | visualising the maps. If I made a patch adding demos to the various
> | colour map functions ('jet', 'hsv', ...) that all do something like this
> |
> |     ## Show the 'hsv' colormap as an image
> |         image (1:64, linspace (0, 1, 64), repmat (1:64, 64, 1)')
> |         axis ([1, 64, 0, 1], "ticy", "xy")
> |         colormap hsv
> |
> | would such a patch be accepted?
>
> I have no objection to additional graphics demos.

Then how about the attached changeset?

Søren

# HG changeset patch
# User Soren Hauberg <hauberg@...>
# Date 1256210820 -7200
# Node ID 9357d0e3d5e0a623509a864c8e09717ebdf621f4
# Parent  584ca012b9e84ea469447e43650b48c4ca315ce5
Add demos for colormap functions

diff -r 584ca012b9e8 -r 9357d0e3d5e0 scripts/ChangeLog
--- a/scripts/ChangeLog Tue Oct 20 20:22:10 2009 +0200
+++ b/scripts/ChangeLog Thu Oct 22 13:27:00 2009 +0200
@@ -1,3 +1,10 @@
[phone]  Soren Hauberg  <hauberg@...>
+
+ * image/autumn.m, image/bone.m, image/cool.m, image/copper.m, image/flag.m,
+ image/gmap40.m, image/gray.m, image/hot.m, image/hsv.m, image/jet.m,
+ image/ocean.m, image/pink.m, image/prism.m, image/rainbow.m, image/spring.m,
+ image/summer.m, image/white.m, image/winter.m: add demos.
+
 2009-10-20  Soren Hauberg  <hauberg@...>
 
  * general/interp2.m: improved error checking and support for bicubic
diff -r 584ca012b9e8 -r 9357d0e3d5e0 scripts/image/autumn.m
--- a/scripts/image/autumn.m Tue Oct 20 20:22:10 2009 +0200
+++ b/scripts/image/autumn.m Thu Oct 22 13:27:00 2009 +0200
@@ -50,3 +50,10 @@
   endif
 
 endfunction
+
+%!demo
+%! ## Show the 'autumn' colormap as an image
+%! image (1:64, linspace (0, 1, 64), repmat (1:64, 64, 1)')
+%! axis ([1, 64, 0, 1], "ticy", "xy")
+%! colormap autumn
+
diff -r 584ca012b9e8 -r 9357d0e3d5e0 scripts/image/bone.m
--- a/scripts/image/bone.m Tue Oct 20 20:22:10 2009 +0200
+++ b/scripts/image/bone.m Thu Oct 22 13:27:00 2009 +0200
@@ -53,3 +53,10 @@
     map = [];
   endif
 endfunction
+
+%!demo
+%! ## Show the 'bone' colormap as an image
+%! image (1:64, linspace (0, 1, 64), repmat (1:64, 64, 1)')
+%! axis ([1, 64, 0, 1], "ticy", "xy")
+%! colormap bone
+
diff -r 584ca012b9e8 -r 9357d0e3d5e0 scripts/image/cool.m
--- a/scripts/image/cool.m Tue Oct 20 20:22:10 2009 +0200
+++ b/scripts/image/cool.m Thu Oct 22 13:27:00 2009 +0200
@@ -50,3 +50,10 @@
   endif
 
 endfunction
+
+%!demo
+%! ## Show the 'cool' colormap as an image
+%! image (1:64, linspace (0, 1, 64), repmat (1:64, 64, 1)')
+%! axis ([1, 64, 0, 1], "ticy", "xy")
+%! colormap cool
+
diff -r 584ca012b9e8 -r 9357d0e3d5e0 scripts/image/copper.m
--- a/scripts/image/copper.m Tue Oct 20 20:22:10 2009 +0200
+++ b/scripts/image/copper.m Thu Oct 22 13:27:00 2009 +0200
@@ -51,3 +51,10 @@
   endif
 
 endfunction
+
+%!demo
+%! ## Show the 'copper' colormap as an image
+%! image (1:64, linspace (0, 1, 64), repmat (1:64, 64, 1)')
+%! axis ([1, 64, 0, 1], "ticy", "xy")
+%! colormap copper
+
diff -r 584ca012b9e8 -r 9357d0e3d5e0 scripts/image/flag.m
--- a/scripts/image/flag.m Tue Oct 20 20:22:10 2009 +0200
+++ b/scripts/image/flag.m Thu Oct 22 13:27:00 2009 +0200
@@ -51,3 +51,10 @@
   endif
 
 endfunction
+
+%!demo
+%! ## Show the 'flag' colormap as an image
+%! image (1:64, linspace (0, 1, 64), repmat (1:64, 64, 1)')
+%! axis ([1, 64, 0, 1], "ticy", "xy")
+%! colormap flag
+
diff -r 584ca012b9e8 -r 9357d0e3d5e0 scripts/image/gmap40.m
--- a/scripts/image/gmap40.m Tue Oct 20 20:22:10 2009 +0200
+++ b/scripts/image/gmap40.m Thu Oct 22 13:27:00 2009 +0200
@@ -47,3 +47,10 @@
   endif
 
 endfunction
+
+%!demo
+%! ## Show the 'gmap40' colormap as an image
+%! image (1:64, linspace (0, 1, 64), repmat (1:64, 64, 1)')
+%! axis ([1, 64, 0, 1], "ticy", "xy")
+%! colormap gmap40
+
diff -r 584ca012b9e8 -r 9357d0e3d5e0 scripts/image/gray.m
--- a/scripts/image/gray.m Tue Oct 20 20:22:10 2009 +0200
+++ b/scripts/image/gray.m Thu Oct 22 13:27:00 2009 +0200
@@ -45,3 +45,10 @@
   map = [ gr, gr, gr ] / (number - 1);
 
 endfunction
+
+%!demo
+%! ## Show the 'gray' colormap as an image
+%! image (1:64, linspace (0, 1, 64), repmat (1:64, 64, 1)')
+%! axis ([1, 64, 0, 1], "ticy", "xy")
+%! colormap gray
+
diff -r 584ca012b9e8 -r 9357d0e3d5e0 scripts/image/hot.m
--- a/scripts/image/hot.m Tue Oct 20 20:22:10 2009 +0200
+++ b/scripts/image/hot.m Thu Oct 22 13:27:00 2009 +0200
@@ -51,3 +51,10 @@
   endif
 
 endfunction
+
+%!demo
+%! ## Show the 'hot' colormap as an image
+%! image (1:64, linspace (0, 1, 64), repmat (1:64, 64, 1)')
+%! axis ([1, 64, 0, 1], "ticy", "xy")
+%! colormap hot
+
diff -r 584ca012b9e8 -r 9357d0e3d5e0 scripts/image/hsv.m
--- a/scripts/image/hsv.m Tue Oct 20 20:22:10 2009 +0200
+++ b/scripts/image/hsv.m Thu Oct 22 13:27:00 2009 +0200
@@ -53,3 +53,10 @@
   endif
 
 endfunction
+
+%!demo
+%! ## Show the 'hsv' colormap as an image
+%! image (1:64, linspace (0, 1, 64), repmat (1:64, 64, 1)')
+%! axis ([1, 64, 0, 1], "ticy", "xy")
+%! colormap hsv
+
diff -r 584ca012b9e8 -r 9357d0e3d5e0 scripts/image/jet.m
--- a/scripts/image/jet.m Tue Oct 20 20:22:10 2009 +0200
+++ b/scripts/image/jet.m Thu Oct 22 13:27:00 2009 +0200
@@ -54,3 +54,10 @@
   endif
 
 endfunction
+
+%!demo
+%! ## Show the 'jet' colormap as an image
+%! image (1:64, linspace (0, 1, 64), repmat (1:64, 64, 1)')
+%! axis ([1, 64, 0, 1], "ticy", "xy")
+%! colormap jet
+
diff -r 584ca012b9e8 -r 9357d0e3d5e0 scripts/image/ocean.m
--- a/scripts/image/ocean.m Tue Oct 20 20:22:10 2009 +0200
+++ b/scripts/image/ocean.m Thu Oct 22 13:27:00 2009 +0200
@@ -54,3 +54,10 @@
   map = [ r, g, b ] / (number - 1);
 
 endfunction
+
+%!demo
+%! ## Show the 'ocean' colormap as an image
+%! image (1:64, linspace (0, 1, 64), repmat (1:64, 64, 1)')
+%! axis ([1, 64, 0, 1], "ticy", "xy")
+%! colormap ocean
+
diff -r 584ca012b9e8 -r 9357d0e3d5e0 scripts/image/pink.m
--- a/scripts/image/pink.m Tue Oct 20 20:22:10 2009 +0200
+++ b/scripts/image/pink.m Thu Oct 22 13:27:00 2009 +0200
@@ -54,3 +54,10 @@
   endif
 
 endfunction
+
+%!demo
+%! ## Show the 'pink' colormap as an image
+%! image (1:64, linspace (0, 1, 64), repmat (1:64, 64, 1)')
+%! axis ([1, 64, 0, 1], "ticy", "xy")
+%! colormap pink
+
diff -r 584ca012b9e8 -r 9357d0e3d5e0 scripts/image/prism.m
--- a/scripts/image/prism.m Tue Oct 20 20:22:10 2009 +0200
+++ b/scripts/image/prism.m Thu Oct 22 13:27:00 2009 +0200
@@ -47,3 +47,10 @@
   endif
 
 endfunction
+
+%!demo
+%! ## Show the 'prism' colormap as an image
+%! image (1:64, linspace (0, 1, 64), repmat (1:64, 64, 1)')
+%! axis ([1, 64, 0, 1], "ticy", "xy")
+%! colormap prism
+
diff -r 584ca012b9e8 -r 9357d0e3d5e0 scripts/image/rainbow.m
--- a/scripts/image/rainbow.m Tue Oct 20 20:22:10 2009 +0200
+++ b/scripts/image/rainbow.m Thu Oct 22 13:27:00 2009 +0200
@@ -55,3 +55,10 @@
   endif
 
 endfunction
+
+%!demo
+%! ## Show the 'rainbow' colormap as an image
+%! image (1:64, linspace (0, 1, 64), repmat (1:64, 64, 1)')
+%! axis ([1, 64, 0, 1], "ticy", "xy")
+%! colormap rainbow
+
diff -r 584ca012b9e8 -r 9357d0e3d5e0 scripts/image/spring.m
--- a/scripts/image/spring.m Tue Oct 20 20:22:10 2009 +0200
+++ b/scripts/image/spring.m Thu Oct 22 13:27:00 2009 +0200
@@ -50,3 +50,10 @@
   endif
 
 endfunction
+
+%!demo
+%! ## Show the 'spring' colormap as an image
+%! image (1:64, linspace (0, 1, 64), repmat (1:64, 64, 1)')
+%! axis ([1, 64, 0, 1], "ticy", "xy")
+%! colormap spring
+
diff -r 584ca012b9e8 -r 9357d0e3d5e0 scripts/image/summer.m
--- a/scripts/image/summer.m Tue Oct 20 20:22:10 2009 +0200
+++ b/scripts/image/summer.m Thu Oct 22 13:27:00 2009 +0200
@@ -51,3 +51,10 @@
   endif
 
 endfunction
+
+%!demo
+%! ## Show the 'summer' colormap as an image
+%! image (1:64, linspace (0, 1, 64), repmat (1:64, 64, 1)')
+%! axis ([1, 64, 0, 1], "ticy", "xy")
+%! colormap summer
+
diff -r 584ca012b9e8 -r 9357d0e3d5e0 scripts/image/white.m
--- a/scripts/image/white.m Tue Oct 20 20:22:10 2009 +0200
+++ b/scripts/image/white.m Thu Oct 22 13:27:00 2009 +0200
@@ -45,3 +45,10 @@
   endif
 
 endfunction
+
+%!demo
+%! ## Show the 'white' colormap as an image
+%! image (1:64, linspace (0, 1, 64), repmat (1:64, 64, 1)')
+%! axis ([1, 64, 0, 1], "ticy", "xy")
+%! colormap white
+
diff -r 584ca012b9e8 -r 9357d0e3d5e0 scripts/image/winter.m
--- a/scripts/image/winter.m Tue Oct 20 20:22:10 2009 +0200
+++ b/scripts/image/winter.m Thu Oct 22 13:27:00 2009 +0200
@@ -51,3 +51,10 @@
   endif
 
 endfunction
+
+%!demo
+%! ## Show the 'winter' colormap as an image
+%! image (1:64, linspace (0, 1, 64), repmat (1:64, 64, 1)')
+%! axis ([1, 64, 0, 1], "ticy", "xy")
+%! colormap winter
+