Basic node questions

[Builtdown]

I have couple of easy basic node questions :

1. I have a diffuse material with white color. I want to add a slight (20% opacity) concrete texture map over it. How should I do this?

2. I have a gray concrete material with a texture map. I want to add a slight (20%) red color over it. How should I do this?


Thanks!

[BorisGoreta]

1 .use RGB texture node with white color and image node with concrete texture

use image mixer node or cosine mix node to mix those nodes together with 20% and plug it in the diffuse input of a material node

2. similar as 1.

[Builtdown]

Thanks.

2. Your method means that the texture image will be reduced 20% when adding red color by 20%? So there is no way to "overlay" a color over an image?

[BorisGoreta]

Then you should multiply image texture node with a slightly red RGB texture node (255,220,220)