Later today I’m going to take some real estate photos for a friend of mine. I haven’t done this sort of photography before but after watching some youtube tutorials, I plan to take 3-5 frames for each picture and then composite them together in GIMP.
The reason for multiple shots is that I will adjust the strobe power in between frames to keep a consistent exposure across the room. I’ll have a grey card reference for each frame that I want to use.
I know I can use the eyedropper in RT to white balance on the grey card. Is there a way to also use the card for setting the exposure? I know in Gimp, I could do this in the levels or curves dialog with an eyedropper sample tool, but I’m surprised that I can’t do this in RT since RT seems to have tools for just about everything else.
Or maybe the way to do it in RT is to first white balance off the grey card, then put a lockable color picker spot on the card, and adjust exposure until the V in HSV is 50? Does a V of 50 correspond to 18% grey?