Is there a way to generate two skin tones with one render?

Flortale

Let's say you want two renders, one with Genesis 8's skin pale, and another with the skin tan. Normally you'd have to render twice, but is there any trick that lets you generate different skin tones from a single render?  I'm thinking maybe there's a tone mapping trick of some kind I'm not aware of.  Tone mapping and skin layers maybe?

Imagine being able to render only once, but having it generate two image files, one with Genesis 8's skin pale, and another image of the same render, but with tan skin.

THEN, imagine this. Imagine being able to render only one time, but have it auto generate multiple images of skin tones ranging from pale to very dark tan, like 10-20 image skin tone variations, but without having to render 10-20 times.  The only problem is that the SSS translucency won't be accurate, but as long as no one can tell I'd be fine with the tone mapping results.

Sevrin

Do your render with canvasses.  Make a separate beauty canvas for just the character and apply whatever colour, etc. corrections just to that canvas and composite as many ways as you like.

Flortale

Sevrin said:

Do your render with canvasses.  Make a separate beauty canvas for just the character and apply whatever colour, etc. corrections just to that canvas and composite as many ways as you like.

Thanks, this is very helpful.  Do you know if those canvassess can be restricted to specific materials on a character, for example, just the skin surface settings; arms, legs, torso, face?

Sevrin

Flortale said:

Sevrin said:

Do your render with canvasses.  Make a separate beauty canvas for just the character and apply whatever colour, etc. corrections just to that canvas and composite as many ways as you like.

Thanks, this is very helpful.  Do you know if those canvassess can be restricted to specific materials on a character, for example, just the skin surface settings; arms, legs, torso, face?

You can't select surfaces, nor can you select body parts from the scene panel as nodes.  You can choose the diffuse canvas, which is good enough to allow you to create a mask for teeth and eyes.  There's the Material ID option, but that gives you a PNG image with raggedy edges that's not ideal for something like a character's face.  I didn't bother with that here, though. You can also create a mask using selections in your image editor, of course.

Can become