ChromaKey filter on still image does not really work

[aminiz]

The following code returns a faded image, not one that has its green removed.

BBMetalChromaKeyFilter(thresholdSensitivity: 0.4, smoothing: 1.0, colorToReplace: .green).filteredImage(with: image)

[Silence-GitHub]

Version 1.1.1 fixes it.

[aminiz]

Thanks for the prompt response! Your change fixes the bug but I am seeing some quality difference between GPUImage2 and BBMetalImage.

I had a green-screen background and put the airpod case, key, and finger on top of it. Then I chromakeyed that image with both GPUImage2 (first image) and BBMetalImage (second image). The MacBook is just part of a different image.

I did not spend time fixing the orientation for the BBMetalImage so please ignore the orientation and aspect ratio issue.

[Silence-GitHub]

Hi, I have a few questions for the bug.

Q1

Do you use this code ?

BBMetalChromaKeyFilter(thresholdSensitivity: 0.4, smoothing: 1.0, colorToReplace: .green)

smoothing is too high. Try to use default parameters.

BBMetalChromaKeyFilter()

Q2

How do you blend two images (Macbook image and chroma key image) ?

Q3

If the bug is not fixed, could you please show me the original image (green-screen background image)? I will use it to test.

[aminiz]

Q1: I get the same result with both.

Q2: I don't actually blend the images. I have an ImageView that shows the MacBook image. On top of that, I have another ImageView that shows the chromakey image.

Q3: Green screen image is attached.

[Silence-GitHub]

I test the green-screen background image in the demo project with iPhone 7 (iOS 13.3). Here are the results.

The original image.

The chroma key image. I use the code BBMetalChromaKeyFilter()

The chroma key image with sunflower image at the bottom.

Are the expected results?

[aminiz]

Yes! I was able to get this result as well now. I had made a coding error where I was setting smoothness. Thanks for the help!