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How are combine and separate nodes used in Blender?
Combine: Re/combine an image from its composite color channels. These nodes can be used to manipulate each color channel independently. Each type is differentiated in the applied Color Space. In compositing and texture context each node supports the Alpha channel. In the texture context only RGB color space is available.
Is there a way to mix two textures?
You don’t actually have to create a new shader and use the mix shader to mix two textures. There is a node called MixRGB which can mix two textures, without creating a new shader each time. There are a few ways to mix a dirty texture onto another texture.
Can a texture be used as a color ramp?
However, it looks like you want more control over what values are being effected (you’re using a color ramp). So you can use the texture as the color ramp and as the texture itself (ignore the MixRGB on the bottom. That just makes it blue so it’s easier to see):
How does alpha over node work in Blender?
Where the foreground image pixels have an alpha greater than 0, it will be overlaid over the background image. Controls the transparency of the foreground image. A factor less than 1 will make the foreground more transparent. Input for the background image. Input for the foreground image. Converts foreground image to Premultiplied Alpha format.
Do you ignore the alpha channel in Blender?
You can also “fade to white” or whatever color you wish, but black is a good neutral color that is easy on the eyes and intellectually “resets” the viewer’s mind. The node tree below shows how to do this using the Set Alpha node. In the example above, the alpha channel of the swirl image is ignored.
How do you set the Alpha of an image in Blender?
The amount of Alpha can be set for the whole image by using the input field or per pixel by connecting to the socket. Method to mix the alpha with the input Image. Multiply the input images RGBA channels by the Alpha input value. In this cases, the output is using Premultiplied Alpha. Replace the inputs alpha channel with the Alpha input value.