LUTs are “look up tables” for colours. They’re useful in many many ways (for instance, a program I use to calibrate displays, QuickGamma, creates a LUT that loads with Windows). But for the sake of image editing, they can be used as “filters”.
Mjc posted links to a few interesting ones here in our 3Delight thread on the DAZ forums.
If you already have compositing software and know how to use it, you may have already tried to apply something of the sort to your renders. But if you aren’t a wannabe compositor, there’s an easier way to make use of them.
3Delight’s dedicated image viewer i-display supports LUTs and will export a JPEG of your image with the LUT applied. Just saving the image out won’t burn the LUT in, so make sure you use export as JPEG (Ctrl+J). The quality is good, but still, it’s lossy so you probably will want to apply LUT as the final stage of your postprocessing.
Choosing a LUT can be done via the menu (see screenshot) or with the Ctrl+U shortcut. Don’t forget to set colour profile to “custom” to see the LUT effect.
If you don’t have the free 3Delight Studio Pro, get it here. It’s the latest free version, so you can export your DS scenes to RIBs and render them via the standalone to leverage the latest improvements.
Here’s an example quick render I made with Mec4D (Cath) birthday freebies (yeah that’s true, Cath gave the community several presents for her own birthday! Isn’t she awesome? Go check out her personal store and her DAZ store page).
The “clean” render is posted to Cath’s anniversary thread on the DAZ forums, so you can compare the effect of this particular LUT (the one whose name is shown in the i-display screenshot; I like it a lot).