The Subtract texture subtracts the value of one texture from another, similar to the Subtract layer mode in Photoshop®.
Figure above on the left shows the regular RGB Image Texture (logo) placed in the DiffuseAmount of diffusion, or the reflection of light photons at different angles from an uneven or granular surface. Used for dull, non-reflecting materials or mesh emitters. Node, which is shown in the first material in the image below.
Figure above on the right shows the Subtract Texture placed in the Diffuse Node and the RGB Image Texture (logo) and the color yellow passing through as the input textures, which is shown in the second material in the image below.
Figure below on the left the Subtract Texture placed in the Diffuse Node and the regular RGB Image Texture (logo) and a Comparison Texture (of Marble Texture and RGB Color Texture green) passing through as the input textures, which is shown in the third material in the image above.
Figure below on the right the Subtract Texture placed in the Diffuse Node and the regular RGB Image Texture (logo) and a Marble Texture passing through as the input textures, which is shown in the fourth material in the image above.
