Colour Management

- 1st stage: Linear Workflow

This implements automatic linear workflow in Blender's renderer. With the 
new Colour Management option on in the Render buttons, all inputs to the 
renderer and compositor are converted to linear colour space before 
rendering, and gamma corrected afterwards. In essence, this makes all 
manual gamma correction with nodes, etc unnecessary, since it's done 
automatically through the pipeline.

It's all explained much better in the notes/doc here, so please have a look:
http://wiki.blender.org/index.php/Dev:Source/Blender/Architecture/Colour_Management

And an example of the sort of difference it makes:
http://mke3.net/blender/devel/rendering/b25_colormanagement_test01.jpg

This also enables Colour Management in the default B.blend, and changes the 
default lamp falloff to inverse square, which is more correct, and much 
easier to use now it's all gamma corrected properly.

Next step is to look into profiles/soft proofing for the compositor.

Thanks to brecht for reviewing and fixing some oversights!

1 files changed, 11 insertions, 1 deletions

diff --git a/source/blender/blenkernel/BKE_colortools.h b/source/blender/blenkernel/BKE_colortools.h
index 6f6c4a834df..c83a260690b 100644
--- a/source/blender/blenkernel/BKE_colortools.h
+++ b/source/blender/blenkernel/BKE_colortools.h
@@ -33,7 +33,16 @@ struct CurveMapping;
 struct CurveMap;
 struct ImBuf;
 struct rctf;
- 
+
+void 				gamma_correct_rec709(float *c, float gamma);
+void				gamma_correct(float *c, float gamma);
+float				srgb_to_linearrgb(float c);
+float				linearrgb_to_srgb(float c);
+void				color_manage_linearize(float *col_to, float *col_from);
+
+void				floatbuf_to_srgb_byte(float *rectf, unsigned char *rectc, int x1, int x2, int y1, int y2, int w);
+void				floatbuf_to_byte(float *rectf, unsigned char *rectc, int x1, int x2, int y1, int y2, int w);
+
 struct CurveMapping	*curvemapping_add(int tot, float minx, float miny, float maxx, float maxy);
 void				curvemapping_free(struct CurveMapping *cumap);
 struct CurveMapping	*curvemapping_copy(struct CurveMapping *cumap);
@@ -60,5 +69,6 @@ void				curvemapping_initialize(struct CurveMapping *cumap);
 void				curvemapping_table_RGBA(struct CurveMapping *cumap, float **array, int *size);
 void				colorcorrection_do_ibuf(struct ImBuf *ibuf, const char *profile);
 
+
 #endif