Join Dave Schultze for an in-depth discussion in this video Make it pop with color corrections, part of Rhino and V-Ray: Rendering.
In this video, we continue exploring the video frame buffer, but focus entirely on using color corrections. This is by far the most powerful feature, and it's my favorite by a long shot. I've got a fairly typical render already complete. So let's briefly analyze it. It's not currently open so we're going to click on the View a toolbar on the show, or F button. So there's my render. I would say this is an accurate rendering although to my eyes it's looking a little bit not so much dark but just kind of flat. It's missing some key ingredients, and that is bright highlights and dark shadows.
So, it's more like a range problem and that's what the curves in the color corrections will solve. First, let's open up the Control Panel for that. This is down here at the bottom. It says, Show Corrections Control. And there's a lot of different tools in this one panel. We're going to focus entirely on curve, which is right here. It's a straight line now. So that means there has been no changes to the spread of colors, as viewed up here in the gradient. So this is a spread from darks to lights, with the R, G and B's broken out separately.
Now, before I make any changes to the curve, right here. Change it actually from a line to a curve. I'm going to have to tell the system to use Color Curve Correction. I could make changes over here, but they would not show up. So you have to click both those buttons. Now the first thing you want to do is click on one of the end points. Be careful not to move it off this grid because that'll distort it into unrealistic colors. And we have a little handle bar that pops up. So what I do is pull this up to the side, and you'll notice instantly this is becoming much more vivid.
What we've really done, is taken colors over here and pushed them more towards the center. The technical explanation is that V-Ray's actually rendering with a lot of data you can't see, and there is information in the highlights and information in the shadows, which just do not show up on a normal monitor. So this is a way of increasing the contrast by moving colors. So we're going to do the same thing with the darks. I usually start off most files by going three grid points over and then three on the other side, and then just kind of keep going until it looks about right.
So there's a huge difference already. In fact, we can turn off, temporarily, using the curves. So this is the before. That's the after. Huge difference. So this is called the S curve, and it's kind of a classic. It's used also in Photoshop and a lot of other editing applications. Now there's some problems you can run into if you use your scroll wheel accidentally. You can zoom too far in or too far out, so you can just right click and go back to zoom all. It will get you back to the original. Also, if you've made changes that it becomes very bizarre looking, you can right-click and reset.
That'll get you back to the straight line. Also, this curve is not saved with your file, unless you save it out. So if I were to close rhino right now and open it back up, we'd be back with the straight line. So even though it's pretty easy to just pull both sides out and then take a look, you can save the data. And the way that's done is, click on Save. There's no special default location. I would recommend keeping it with your 3D file or on your desktop temporarily. We'll just call this the Dave curve, Save it.
Now if this gets lost or disturbed, we'll actually do a Reset. Now we can get it back with the right-click, and Load. Go back to desktop, there's the Dave curve. Hit open,and we're back to where we started from. So by using color corrections, you can give your renderings what I call, poppage, meaning, the design pops out from the background. Remember the goal is to make a powerful impression with your audience, and the first impression is important. This technique will save you lots of time from changing camera exposures, or lighting or materials.
It's not a good match for a rougher preview render, but I highly recommend using the Curves Color Correction for all medium to high quality final renderings.
- Why use V-Ray?
- Installing DR Spawner
- Understanding 3D terminology
- Activating V-Ray
- Adjusting quality settings
- Get quick previews with the material override
- Understanding lighting types
- Exploring materials in the Material Editor
- Creating your own materials
- Texture mapping materials with bitmaps and procedurals
- Saving time with V-Ray presets
- Getting the right size for your render with output settings
- Working with environment lighting
- Strategies for working with cameras and camera settings
- Ensuring accurate color for your scene with color correction
- Rendering tips and tricks