change opacity of one single color

[Dutch_Condor]

Goodday

I'm trying to change the opacity of one single color in a layer.

What iI need to get at the end is:
- that all that is black should be 0%
- one other color abt.50/50
- while all the rest to be at 100%

Anyone knows easy trick to do that?

Rgds!

[Michael Grenadier]

I think you're talking about either a chroma key and a luma key.  you'll need to apply the appropriate effects.  

but unless the video was shot properly, you'll probably have some issues.  

[Dutch_Condor]

hi There

Actually the file where I want to make a part semi-opaque is just a photo, as an overlay on my video.
I just made a PNG where I already can make an alpha-channel. So the part fully-transparent I solved it:-)
But still struggling to make one specific color semi-transparent while all other colors keep opacity at 100%
Already tried something with Luma Key and Chrome Key, but as not being familiar with it for sure doing something wrong 😉
Tonight will try more with those options as you mention 🙂
If I still cannot get it fixed will upload a screenshot of what I want to make.

many thanks for first reply!

[Byron Cortez]

And this is a recorded video or a flat colors video like a motion graphics?

[Michael Grenadier]

This will be much easier to do in photoshop.  If you can put each "area" on a separate layer (solid, semi transparent and transparent) and save as a layered photoshop file and then import each layer individually into premiere, you'll be able to adjust transparency individually for each layer.  I suppose you can make the semi transparent layer it's own ping and then bring that it and adjust the opacity for that layer.

[Dutch_Condor]

smart trick:-)

Actually dont't have photoshop, working with Gimp, very likely will have the same option as well. so will check out this one tonight as well 🙂

[Dutch_Condor]

After some struggling somehow solved it with basic Color Keying 🙂
Removed the alpha channel in the original PNG-file, made it just a black background.
Keyed the color that I wanted to be semi-transparent in the PNG-file with a color matte with a certain opacity below it.
Nested the result
Then Keyed the black in the nested sequence with my actual video below it.

Don't know if this is the best/simpliest method, but it gives the result I need 🙂
Thanks for your help, you triggered me to look further in the keying methodes!