Select Sample Colors
To set up a sample colors (RGB comparison), you simply take one or more point color samples of the background color. The algorithm then compares each pixel in the photographed image to these point samples. If the color of the pixel is within the tolerance range that you set for this point sample, the pixel is made transparent. You can pick as many samples as you wish, but the rendering slows down if you pick too many.
The RGB transparency method requires you to select Point Samples to compare the image to. There are two ways you can select a point sample.
1. Press the 'Add' button. Click on the 'Color Selector' press the Advanced button, and enter the Red, Green and Blue values of the color desired. While selecting a point sample in this manner is possible, it is recommended that you use method 2.
2. Press the 'Pick Color' button. The mouse cursor will turn into an eye dropper. Position the mouse over a green part of the target image and click the left mouse button. This will pick up the color underneath the eye dropper cursor and add this color to the Point Samples. This is the recommended way of selecting a point sample.
Shadow/Highlight
This is similar to Sample Colors, but you need to pick two colors and these colors and the colors between them will be used for transparency.
Background Subtraction
To use background subtraction, you take a photograph of the green screen with nothing else in the image. The algorithm then compares corresponding pixels from this 'Empty' image to the pixels in the image has an object in it. If the pixels match within the tolerance range that you set, the pixel is made transparent.
You can specify an actual jpg image for the background or alternatively use the most recent image in a folder. The latter method is good for studios with natural light that might change during the day. You simply drop in a background photo every now and then, and the latest sample will be used.
