New Color Space RGBW

[mikemeister_admin]

The RGBW color space

Curvemeister makes use of the benefits of the CMYK color space, especially the separation of the black component. Why not do the same in RGB by separating the white component (RGB-White)? This could be handy to to work on the lightness and highlight components of a picture uncoupled from color information. Color cast correction in neutral tones alone becomes possible.

Have a look at some examples at

http://kietzmann.kilu.de/rgbw_color_space.html

and let me know your thoughts. Might be a nice idea for implementation in the next version of Curvemeister.

Reinhard

[ggroess]

Other than the over saturation possible in CIELAB it already does this.  You just have to watch for out of Gamut colors

Greg

[mikemeister_admin]

What do you try to tell with this? Should I be able to achieve similar results in another color space?

[ggroess]

The only thing that is important to me is that you are able to get the results you want and that you understand the color space or tools that you use. 

I see RGBW as a "negative" of CMYK  and to me there would be no clear advantage other than your understanding of it...from my current viewpoint.

I did read your posting about it and I understand I think...what you are trying to show.  That is why I suggested CIELAB.  It separats the lightness from the color and it is easy to learn how to use. It is simple in it's approach and there is already built in support for it in all of the major photo tools.

No offense was intended...
Greg

[mikemeister_admin]

Got it now.

I agree with you that RGBW is a negative of CMYK and that was the intention. Thus I think RGBW has other characteristics than CIELAB.

I need to gain some more experience with working in RGBW to evaluate the benefits of it, but I think they should be found around
- avoiding out of gammut colors (compared to Lab)
- high key photos manipulation

I will work with it for a while and see which benefits will show.

Reinhard

[-default]

My first reaction is love at first sight!  I'm always worrying about highlight detail  Without committing 100 percent, this would be a major feature addition, for Curvemeister 4.

[mikemeister_admin]

I am not using CMYK a lot. Thus I am thinking  more in RGB (or sometimes Lab). This was the reason why I developed RGBW. However, I am still exploring the chances and benefits of it. Adjusting the highlights and the colors of colored objects without impacing grey or white objects should be the most obvious applications.

May be users who are more familiar with working in CMYK will be better able to work out the new opportunities with RGBW. Let me know your experience with it.

Reinhard