A

Anonymous

Question

Multiple colors keying

Forum|Forum|6 years ago
March 3, 2020
2 replies
3699 views

Hi,

I'm pretty new here, i had a look around and i can't seem to find the solution to my problem.. although it seems logically not impossible (excuse my bad english 🙂 ).

So my aim is to key out different colors in a video i shot and replace them with different images/video (have a look at the frame of the video down here)... the half-solution i found was to key out a color (just like you do for a normal green screen), NEST the scene and proceed to keying out another color, NEST the scene and so on.. the main problem is that the second-third-fourth keying will effect also the all the previous SUBSTITUTED colors/scenes, this way i'm allowed to put, say, into the pinky only yellow images, in the ring finger only blue images etc... otherwise the keying screws up everything... I hope that's understandable!

The only way around it i can think of, is to find a blend mode that's kind of "TRANSPARENCY TO COLOR" (if such a thing exists) and put the layers ON TOP of the main scene and make each one fo them "VISIBLE only to a certain color" of the background (which would be the main scene)...

I'm really going with the logic here.. i hope my question is understandable and i hope the solution exists!

thanks again

Massimo

:

How to

Richard van den Boogaard

Community Expert

Please try to isolate each finger in a separate layer using masks; then apply the effect to that specific layer and put it all together in a final layer super-imposing the seperate layers + the original layer at the bottom.

Hope this helps.

chusbaker

Participating Frequently

Hi Massimo Tortella,

I think your idea will not work, to be able to key a color you need to have one tone of a color and you have many tones, from clear almost white to a dark tone of each color so the key will not work well anyway.

Best of luck

A

Anonymous

Hi, thanks for replying, I know it won't work well with this kind of color, light and quality probably as well.. but it's really a lo-fi effect i'm looking for so i don't mind glitches and "errors".. i'm just interested on how you would do it.

Isn't there like a "show on a X color of the background" blend mode/effect?

thanks

M

chusbaker

Participating Frequently

HI, so the 4 videos inside the fingers end up being black and white but they are 4 different videos (earth, forest, waterfall, fire).. i need different colours to keep each video in its finger (pinky-earth, ring finger- forest, mid finger - waterfall, index-fire)

Ok, so there are different techniques you can use, I will explain a generic you can apply to any different set ups.

The main idea is to generate an alpha channel from your video that will act as a window to a different layer where the second video is located. In this case, you have to do this as many times as fingers or colours you want to apply it to.

Steps:

You need to get a clear black and white image where you can distinguish clearly the parts of the video that will be transparent to the ones that will be opaque. You can use Ultra key, and once you feel you have adjusted the color, go and select alpha channel. This can be then exported as a video file and reimported into Premiere. Apply a Set Matte so you can select the layer to which you want to affect with the alpha (remember you might have to invert the alpha to get the desired composition). This way, you will not have any unwanted coloration from the Ultra key effect.

Once you have it done, repeat to the rest of the fingers. The final layout of your tracks will be: original video hand in V1, V2 to V9 pairs of composite layers of alpha and video.

Best of luck

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