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Setting the Backdrop |
An image can have a solid colored background, over which the image is rendered. Normally, the image is rendered as solid and so this backdrop wouldn't be shown. You can, however, for nice effects, show a backdrop.
1. Make sure the details panel on the right is shown (click the button on the bottom right or type 'd' if it isn't shown). 2. Select the "info" tab (the "i" in a circle). 3. Make sure the "Render with Alpha" checkbox is checked. 4. Click the "Background Color" color well to change the color. 5. Make sure that the structure has a connection to the last input of the "Output Color" node (the alpha component), and that this connection is something other than 1.0 |
If the image doesn't draw (and you only see the background color) this indicates that the alpha component of the "Output Color" node has a value of 0 (or less). If the image draws but without a background, this value is 1.0 (or more). To see how this works, you can connect the last (Z) output of the "Input Coordinates" to the last (alpha) input of the "Output Color" and then when slide the slider in the main window you'll see the image fade in and out.