I often get asked by clients and vendors how I process the photos, especially when I'm showing them the results of a shoot on the back of the camera. As far as Photoshop goes what I do is fairly straight forward but I have picked up a few tricks over time...
If you don't know Photoshop bits of this wont make much sense... it isn't meant to be a tutorial, but it should give you a rough idea of what is involved in Post Processing.
Here is a photo from a shoot I did for Peter Schaad last week who is a Design and Decorating Consultant, it contains most of the steps I use when processing.
Step 1. I always shoot in RAW mainly because of the control it gives you over white balance. Most homes have a mix of tungsten, enviro, fluro and daylight in them, all of which have different colors.
I shoot multiple exposures from each angle usually with one image for the shadows (over-exposed), one image as the base image (usually meter-as-read), and one or two images for the highlights (under-exposed, usually with fill flash to light up the window sills and frame).
Notice how the exposures are different, meaning different parts of the images are lit optimally in each.
So Step 1. is processing these RAW images into jpegs or psds.
For example, Step 2 will be blending these first two images. Notice how the top and RHS of this one is a bit red and over-exposed?
Step 2. This is image 1 and 2 blended together.
Step 3. This is the above image with the window "zone" dropped in. Because I'm a bit of a drongo sometimes I forgot to include the bit that is in the reflection of the mirror... duh.
Step 4. Here I have dropped in the painting. Selecting around a painting like this is fairly easy, but it is important to include in the selection the drop shadows the frame puts on the wall... with out doing this it looks obviously photoshoopped. This would have been much trickier if the plant on the table had been much bigger because I would have had to select around it too... in this case I just asked Peter to hold it a bit higher up the wall. After placing it there I just had to clone over where his fingers were on the frame.
Final Image. Here I dropped in the floor from the window exposure again to get rid of the overexposed and blue floor under the window... which meant selecting around the chair legs... usually I try to avoid that but sometimes it is unavoidable when shooting at daytime. I have also tweaked the levels and dodged and burned mainly on the tapestry just to fine tune.
And that is how I do a fairly standard interior... this is just one way of about a million but I hope it gives you an idea of what is done in post production.