@1940 @emmrecs

Hi,

It's #40 on the hit parade.

I suggest that you raise a ticket with Magix. They should have had this fixed right after it was detected.

In the meantime, use Color and the color picker to select the green area.

Jeff, try placing something under the colour swatch to see if it actually works. For most of us, it doesn't; the green becomes dark grey.

John CB

@browj2

Actually John I don't see anything become dark grey!

Herewith three screenshots:

A single colour (blue, obviously) object:

Added, on track below, the colour bars image (slightly different aspect ratio):

Selected chroma key, green, on the colour bar track, no adjustments made to settings on chroma key screen:

The central green bar is now most definitely blue!

Or am I doing something very wrong?

Jeff

@emmrecs

Hi Jeff,

I don't know what is happening with yours, but there have been a lot of complaints, mostly on the French side, about this.

Here is what happens:

Applying Green gives:

Undo, applying Color (before adjusting) gives:

This is what other users have found.

John CB

@browj2

Hi John.

I repeated my "test" albeit slightly differently.

I used 3 solid colours, blue green and red, sized as per the screenshot below:

I then muted/hid the largest (blue) object and exported the red and green as an .mp4 (to try and eliminate the possibility this was something "peculiar" to a video file as distinct from a static object).

The mp4 was then added to the timeline, the "blue" track unmuted/unhidden and Chroma key (Stamp) selected for green. The tracks containing the separate green and red rectangles were still "muted".

The result:

No green and no grey!

Not sure what to make of all this!!! 🙃🙃🙃🙃

Jeff

@emmrecs

Grrr! To make a liar out of me, I tried 2 methods, one by creating images like yours, and the other by using a treated video. For the latter, I had made a section, used Chromakey green, and had a background of perfect green. This worked fine. However, the original no longer worked by clicking on green. Increasing the threshold to full got rid of most of the grey, but this was nowhere near what happened before when I was able to remove my actual green screen.

The one that works:

The original one that doesn't:

Here is another thread showing the problem but in MEP:

https://www.magix.info/us/forum/chroma-key--1238650/#ca1517000

and one in French for VPX:

https://www.magix.info/us/forum/chrominance--1238959/

John CB

I am being optimistic I guess, but did they fix the chromakey for VP yet?

@1940

There have been no recent patches to VPX11 so no, nothing "fixed" at the moment! But, as I observed earlier in the thread, this problem clearly does not occur on my machine, running 17.0.3.68

Jeff

@1940, @browj2, @emmrecs

Hi

. . . . but did they fix the chromakey for VP yet . . . .

Not yet, after some further testing, whether it works correctly or goes grey depends on the actual colour of green.

For example using this composite image, of full green, the 'Chroma green' reference colour and the green screen in a pro test video I have

Gives this result

HTH

John EB

@johnebaker @browj2 @1940

OK. I decided to attempt to recreate what John Baker had found, created a very similar colour test (using the exact RGB figures that John gives) and saw this:

So, John's results confirmed.

However, increasing the Threshold by only a relatively small amount gave this:

Here the blue background is clearly "darker" than the original but, arguably, a "step in the right direction"?

Jeff

So I could finish my brief, I upgraded my old Power Director program to their 365 as it has chromakey that one can change the variations of colour. Excellent !

A much cheaper program, so why not VP?

@1940

Hi

. . . . chromakey that one can change the variations of colour. . . . so why not VP? . . .

It does, @browj2 gave you the method in his first post above.

Here is a clip showing it in use with blue screen which has the same issue if the blue is the incorrect colour as seen in this example.

The Color option is also more flexible than the standard Stamp options

John EB

@1940, @browj2, @emmrecs

As an aside, while rebuilding a laptop, I have carried out another experiment to see how red and blue color contamination affect the green screen effect.

Using this triple colour gradient

This is the result in MEP and VPX

The colour move effects are :

• adding red - has a significant effect as the green moves towards yellow
   
• adding blue - requires a significant amount of blue before it becomes noticeable as the green moves towards cyan
   
• adding equal red and blue - the amount of blue added significantly reduces the effect of adding an equal amount of red as the green moves to a lighter version.

This confirms that red contamination has a significant effect.

John EB

Colors in the monitor scree appear to be lacking red. Red shows up as black, purple or grey