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How to render with alpha channel defined by?
Put the cube on a separate render layer from the scene: Set transparency under Render properties: The Scene layer image should be used for the output image. The Cube layer’s alpha is inverted and used as the output image alpha. If you don’t want the shadow, just exclude the cube’s layer from the scene:
How to use alpha channel for transparent materials?
What I am trying to achieve is rendering out a clear plastic object in Octane with ‘alphachannel’ turned on, saving the render as a transparent PNG image, and then using Photoshop to place a background image behind the clear plastic object so that the background image can be seen through the clear plastic object.
How to use your background image in octane?
The other way is to use your background image for the environment texture in octane. You may be able to get away with tweaking the scale and location (depending on your scene) or if this is obviously distorted or tiled, then you will need to somehow either covert or composite your background into an HDR environment map.
Why do you add octane to transparent materials?
To have proper visibility of the background, effected correctly by the index of refraction on it’s way through your material, the background needs to be added in octane so it can be sampled in the scene. Chris. Thanks again for you response!
What kind of data is in an alpha channel?
Alpha is a type of data, found in 32-bit bitmap files, that assigns transparency to the pixels in the image. Alpha channel shown in black, on the right. A 24-bit truecolor file contains three channels of color information: red, green, and blue, or RGB. Each channel has a particular intensity or value at each pixel.
How do I save an image to the alpha channel?
To return to the regular display, click Display Alpha Channel again. To output a rendered image with alpha, save in an alpha-compatible format such as TIFF or Targa With Targa, the default settings include saving alpha; with TIFF, be sure to turn on the Store Alpha Channel checkbox. Was this information helpful? Post a question.
What’s the difference between 0 and 255 in Alpha?
An alpha value of 0 is transparent, an alpha value of 255 is opaque, and values in between are semi-transparent. Transparency is important for compositing operations, such as those in Video Post, where several images are blended together in layers.