[Gimp-user] how to darken bright areas

[paulhurm <forums gimpusers com>]

> On Wednesday 04 January 2017 21:02:15 paulhurm wrote:
> Chuckle...  Make the connection with RGB in the video realm, where its
> all additive. So much red, so much green, and so much blue is white.  
> Hence its RGB. In the video realm, its basically a matter of ajusting 
> each colors gain once black is established, to get a pleasing white on
> the video screen. THis is RGB.
>
> OTOH, The print realm is all subtractive, the Cyan reflecting green
> and
> blue but absorbing red,, the Magenta reflecting red and blue but 
> absorbing green, the yellow reflecting red and green while absorbing 
> blue, and K is the combined luminance expressed as the density, hence 
> the CMYK designation.
>
> One, RGB references just barely visible as black, while CMYK
> references
> the base color of the whiteish paper as its white, and inks are laid 
> down to subtract the RGB from the white.  And often, to save the 
> expensive colored inks, the blackest areas will get a reduced amount
> of
> color in favor of getting a more consistent black by useing black to 
> build the density needed with far less ink.
>
> Neither method can at the end of the day, represent the complete color
> spectrum the human eye (with good color vision) can see, but generally
> can be tweaked to do a decent job in the center 2/3rds of that color 
> chart we've all seen in the past few decades.
>
> Thats not all of it, but thats about as simplicated as I can make it.
> I
> hope this helps.
>
> Cheers, Gene Heskett

So much to learn and become familiar with. I did happen to go out and read up a
bit on the RGB vs CMYK issue but the above helps too.

If you read my other recent reply, watch for a reply where I plan to post my
recent before and after attempts.

Thanks.

Paul


-- 
paulhurm (via www.gimpusers.com/forums)