Banding on Z9

MCLV wrote:

JimKasson wrote:

vtpeters wrote:

JimKasson wrote:

MCLV wrote:

As I described here https://www.dpreview.com/forums/post/65887363 , using mechanical shutter will blur the banding. For f/2.8 and assuming shutter location 4 mm in front of the sensor plane we get a diameter of light cone of 4 mm / 2.8 = approximately 1.4 mm. Therefore, blurring caused by mechanical shutter would be roughly 1.4 mm / 24 mm = 5.8% of image height and 1.4 mm / 24 mm * 2000 = 117 pixels of the original image. Hence, I simulated how the image would look if a mechanical shutter was used by applying a linear blur of 117 pixels in vertical direction. I then applied layer mask around Yngwie, so he is not completely blurry. You can see results below.

Original - Electronic shutter

Simulated mechanical shutter at f/2.8

Good demo. You did this in the spatial domain, but you could have also done it in the frequency domain. A vertical 1xn kernel or its frequency-domain equivalent lowpass filter is also an effective mitigation tactic in post.

Could you explain this further for me.

I'm not that well versed in using Photoshop or Lightroom.

I don’t think there’s any way in Ps to get a custom kernel bigger than 5x5. AFAIK, Lr doesn’t support custom kernels at all. That’s why I suggested FFT earlier.

If you’d like. I can post code for doing it in Matlab.

You can use motion blur function instead of 1xn kernel. However, I didn't check if it averages the light intensity correctly or if it operates on RGB values directly.

Good idea!