In reply to Celso Bressan.

Hey Celso,

That’s very interesting – I must definitely try that out! Thanks for posting it here 🙂

–Jacob

Your detailed explanation is a GENERAL case. I know a variation that is called the VELVIA effect which does not touch the lightness (it can be touched before or after).

In this variation, channels “a” and “b” are selected one at a time this way:

1) In Channels, select one of them;
2) Choose Image/Adjustments/Levels;
3) Move the Input Levels on the left cursor to the right by a certain amount until you get closer to the peak of the color;
4) Move the right cursor to the left by the SAME amount you moved the left one (this is very important);
5) Proceed to the other channel in the same fashion;
6) Convert the image back to RGB, if you want.

And this is it! It simulates the velvia colors from the old Fuji films to give an extra punch to the pictures.

In reply to Paul Franklin.

Hi Paul,

I got me! Thanks a lot, and thinking about it, it’s a stupid mistake to make. Of course, the RAW file has its own native color space.
I will update the article accordingly. Thanks!

–Jacob

Just a small correction to your comment “This photo is shot in AdobeRGB and when I export it to Photoshop, I have set up my Photoshop to also work in AdobeRGB.” You said later that you shot this in RAW so therefore you did not shoot in in RGB, you shot it in Camera Embedded color space. The RGB and sRGB in your camera is only for JPEGs.