Graff desaturation
Graff desaturation
Hallo. I use Graff 1.0.24, and it looks like the desaturation algorithm performs not properly. I just compared the desaturated image with the same image after the desaturation in GIMP. Should I commit the bug report on that ?
Re: Graff desaturation
Currently we use the following desaturation algorithm: C = (R + G + B) / 3.
Before committing a bug, I suggest to discuss desaturation here.
Before committing a bug, I suggest to discuss desaturation here.
-
- Site Admin
- Posts: 20
- Joined: Tue Dec 16, 2008, 20:29
- Contact:
Re: Graff desaturation
Photoshop uses the following approach. In the gray value of the pixel should the luminance be written. It is calculatd as average sum of the maximal and minimal color channel values.
Re: Graff desaturation
The difference can be illustrated here:
Re: Graff desaturation
Maybe it will be better example:
Re: Graff desaturation
Starting from the version 1.0.30d we have corrected the Desaturate function. Now it produces the same result as in Adobe Photoshop. Basically this function, now uses the Hue/Saturation functionality, i.e C = [Min(R, G, B) + Max(R, G, B)] / 2.
To achive old result, i.e. C = [R + G + B] / 3, please use function Black & White with default settings.
To achive old result, i.e. C = [R + G + B] / 3, please use function Black & White with default settings.
Who is online
Users browsing this forum: No registered users and 2 guests