This tutorial is for more advanced users that don't need much explanation on how to make a sig.
We will be hopefully making the above sig
First put your render on a new layer on a 300x100 px document
Make a white to black radial gradient on the layer below it
Take a default brush of your choice and go into the brush settings, click scatter, smoothing and shape dynamics, choose something that fits your likings.
Smudge your gradient layer and brush with black and white with the same settings as your smudge but with your brush. Then you continue to smudge.
I got this
Duplicate your render layer and smudge the bottom one and set it at screen.
Lightly erase the bottom of the main render with a soft brush
I got this:
Make a layer and apply dark blue soft brushing everywhere except for the focal, make a layer with light blue soft brush on the focal, smudge both layers with your previous settings and merge. Set to soft light.
Repeat with red instead of dark blue and yellow instead of light blue. Set this to overlay and lower the opacity. Erase over the render.
Add in a couple of c4d's at screen
Now we will add some adjustment layers
Gradient map>Purple to orange set at softlight, and 40% opacity
Gradient map>Blue red yellow at softlight/30%opacity
Now on a layer above the rest, take a 200 px white soft brush and brush for lighting
Now a black to white gradient set to luminosity at 25 percent opacity.
You should have something like this.
Make an overlay layer and brush with black splatter brushes.
New layer>image>apply image>duplicate
Sharpen the bottom image, blur the top and erase over the focal on the top layer.
Lower the opacity of the sharp layer if it's too harsh
Add some text and a border if you want and you're done!!DO NOT RIP ANY OF THESE IMAGES