How do I achieve this color effect in the compositor? I have been wanting to create an effect where the contrast between the warm and cool colors, or the green and violet is very visible. At first I thought I could increse the contrasts on the A or B chanles of the LAB color space, but when I asked this question I was told that this is not the right way to achieve this efect. link to old question: how do I work with LAB color space in the compositor?
This should be somthing that can work for animations. (I.e no pixel by pixel color correction.)

These are some pictures of the effect I am trying to achieve:

Effect #1
https://istoleyourcereal.wordpress.com/2012/05/03/warm-and-cool-contrast/#jp-carousel-117

As you can see the warm and cool colors are very distinct.

Effect #2

https://www.flickr.com/photos/iucnweb/6146692092

It was mutch harder to find an image with this effect, but as you can see the reds are very contrasted with the greens.
You can use a hue correct node and using the saturation controls select the color range you want to affect: