When compositing two images together it is very important to make them blend together nicely. There are a lot of steps involved in the process. I am going to show you one of those things you need to do in order to make to images blend together. And its called edge blur.
Here we have to images. The first one is the background and the other is a cut out picture of a girl. Both images are from Vyonyx website. So we need to blend those two together.
So you rendered an image that you need to send to a client. And its a beautifull product design that needs to have a white background. But you forgot to render and alpha pass to remove the background or you have a situation where you cannot render with alpha from your 3d package and it absolutely needs to be white. So you call photoshop to the rescue
You can do all sorts of things in photoshop, you can clone the background, you can take a brush and just brush out the colored parts, you can crate alpha maps but i found a really simple and effective way to do that in photoshop.
Ive seen a lot of people, usually people just starting in 3D or starting in lightning interior scenes, doing their light the wrong way. GI is a fantastic thing but beginers use it in a wrong way. Not just the beginers, some people are doing interiors for a few years and still do such mistakes. I am not going to write about what GI is, there are a lot of articles on the web on that subject. GI is, among other things, is used to assist with your lightning in a way that it fills in the black parts of your scene. I know that this is not nearly a good explanation what GI is or its the most acurate but its good for this purpose. A lot of people use GI like it is a light source witch is wrong.
Take this scene for example. Ive modeled a very very simple scene here so no modeling awards . Ive used a vray sphere light to simulate a sunlight and did a render with no GI and it looks like this
I recorded this for a friend quite some time ago so its a waste just to sit on my harddrive. It is very basic so keep that in mind. You can download it from this link.