I am new to DT (a few days) so much to learn but I have used it to edit some street photography images recently and I’m just blown away by it’s abilities.
I am fascinated by a youtuber who takes snapshots of historic buildings and then creates beautiful super-processed images of them using LR. I have been trying to emulate his methods using DT.
I would like to create a “lit by a lamp” effect - in LR it seems there is a slider to apply a yellow hue to a mask. In DT I have successfully applied an EXPOSURE mask around the lamp with a nice effect of (1) localised glow from the lamp, (2) lamp shining on the nearby fence, (3) cut off the fringe of the exposure boost by adding a MODE=DIFFERENCE region which cuts off the edge of the increased exposure.
So my question is, what is the best way to create a nicely yellow hue to the light pool around the lamp? At the moment I can only create a pure white “exposure” effect which isn’t realistic.
Hey, welcome! Always better to post an image to get a better quality answer.
Color Balance RGB > 4 way tab > highlights, move hue to yellow, increase the chroma. Use a mask to limit the effect to a specific region.
Thanks. So, I have to first place a positive exposure over the area, then I add a 4 way color balance using the same mask?
I’m actually using three exposure masks. A wide, soft one showing the light spilling onto the fence, then a tighter, brighter area over the lamp bulb and finally a central area over the bulb element. So do I have to have three, matching color balance modules to convert each to a yellow hue?
https://i.vgy.me/UhuJC5.png
You should be able to change the luminance from Color Balance RGB, not a huge change, but quite a bit.
No, you can use a single module instance of Color balance RGB to do everything you want to and have multiple masks in a single module (they will add yellow hue and luminance). You can also play with mask opacity to adjust intensity of individual masks to achieve the look you want. I also find global offset useful for adding slightly hazy look.
If you create a post under category Processing and subcategory Play Raw, submitting the raw file under CC-BY-SA license you can let other people edit the photo and see what they come up with. By loading their .xmp files into DT you will be able to see their edits.
I’d personally be interested in trying it out 
Thank you all for your excellent answers. Having multiple masks inside one module is helpful. Just using luminance adjustments didn’t work well - perhaps the underlying image was just too dark - the effect was like a bright patch stuck over the top.
I’ve kept the exposure module to create the pool of light and then color balance rgb (with copied shapes and varying opacities) to apply a warmer hue. I’m ready to move on to the next stage so I’m sure I’ll be back with more questions.
Sounds like you need to add feathering.
Bruce Williams has a series on how masking works:
