Add alpha to mixer

[GoogleCodeExporter]

Hello, think is important have a new slider of alpha -over a white background-.
To see all power of the tool, in a alpha context.

Original issue reported on code.google.com by jabiertxof on 15 Apr 2013 at 8:59

[GoogleCodeExporter]

Are you referring to displaying the current color over a white background with 
the level of opacity you choose?

Currently, you can achieve this using the 'Color mixer' secondary panel, which 
can be activated by opening the View menu, choosing 'Secondary view' and then 
choosing 'color mixer'. By dragging your desired 'background colors' onto one 
of the left set of colors, and dropping the color you want to mix onto the 
large central color area, you can see the result on the right. Opacity is 
adjustable using the slider at the bottom.

Original comment by 00a...@gmail.com on 23 Apr 2013 at 7:31

[GoogleCodeExporter]

[deleted comment]

[GoogleCodeExporter]

Thanks, i see it!

I see too a problem -look alpha of row- if you drag the central "add" color to 
the left color.

I think is more usable, clear and give more information to the user,if use a 
slider in main window instead a new panel what need a manual update if you 
change values in main panel.

Sorry for my english.

Hi and thanks for the response.

Original comment by jabiertxof on 23 Apr 2013 at 10:14

[GoogleCodeExporter]

Another problem whith the actual breabiour is it give the result color not the 
original plus the alpha value. Some times this is necesary.

Hi and thanks to hear me

Original comment by jabiertxof on 12 Jun 2013 at 2:11

[GoogleCodeExporter]

Another problem with the  'Color mixer' secondary panel is it give the result 
color, not the original plus the alpha value. 

Some times this is necesary.
Hi and thanks to hear me

Original comment by jabiertxof on 12 Jun 2013 at 2:18