Added plot widget to display the various 256x256 functions we have.
This is still a bit buggy.
When a change is made the old series is still shown in the display.


check-in: 13eb3abf7b user: andreask tags: ak-experimental

Fixed another doh, this time in the (de)gamma tables.

I failed to scale the pixel values into the range where gamma
operates, i.e. [0..1] before doing the (de)gamma. Now that I do this,
and scale back after the application the operation behaves as expected
and proper.


check-in: 2809295fef user: andreask tags: ak-experimental

Doh. When implementing the blending for HSV to understand the weird
colors generated by the RGB I noticed the reason why. I am a person of
no brain at all. Forgot to initialize the 'ralpha' value, i.e. instead
of mixing alpha versus 1-alpha it was alpha versus some random value.

This is now fixed.

All blenders have now also been converted to the MIX macro and ralpha.
Two demos now, RGB and HSV blending. Both work and look ok. They are
different however in the path they take through the color space while
interpolating, with HSV looking a bit more unnatural.

Added a second over demo as well, reversing the roles of fore- and
background images.


check-in: 1ea8c1d2af user: andreask tags: ak-experimental

New operators:
* blend (2 images per user chosen alpha value)
* over (blend two images per the alpha of the foreground)
* setalpha (replace/add alpha channel in image from 2nd image)
* blank (generate image of uniform color/grey level)

Additional demos for these ops.
Additional images for use by the demos.

The blend demo currently does a single image against uniform
black. Blending two independent natural images has psychedelic
results, doesn't look good. This in RGB space. Needs more thought.
Should maybe convert both to HSV and result back ?


check-in: 8b81d87cd6 user: andreask tags: ak-experimental