u/05959

Hi everyone,

I'm currently grading some Canon C70 footage using the CinePrint35 PowerGrade, but I’ve run into a bizarre visual glitch. (I’ve attached a screenshot below).

Whenever I try to push the highlights/gain in the primary node (or sometimes just adjusting exposure), these massive white rectangular pillars completely cover the screen. It looks like a severe GPU render failure or a math error.

Here is my setup:

20.3.2 build 9

Footage: Canon C70 XFAVC 4:2:2

System: Mac with Apple M1 Pro (16GB RAM)

PowerGrade: CinePrint35

Issue: Pushing highlights causes aggressive white vertical artifacts. And if there's highlight clipping, there's black blanking.

I suspect it might be an issue with the Halation or Glow nodes not handling the over-bright pixels (clipping) properly, or perhaps a color space transform mismatch causing NaN (Not a Number) math errors.

Has anyone experienced this specific "white pillars" glitch with film emulation PowerGrades?

What is the proper workflow to push highlights safely without breaking the node tree and causing these artifacts? Should I be using a soft clip or gamut compression before the PowerGrade?

Any advice or insights would be hugely appreciated!

https://preview.redd.it/vpkb1jtx8izg1.png?width=6016&format=png&auto=webp&s=0bb283df6f85a785468e79714e9d0c8be48b5287

https://preview.redd.it/yondt0o88izg1.png?width=1580&format=png&auto=webp&s=4f40a6cb9198c583d3247cb267f40cc08d45577c

https://preview.redd.it/o54vwzja8izg1.png?width=1618&format=png&auto=webp&s=cec7662d5edbae35e218dbc65adb668832da20ba

Hi, I have been using MFT for 8 years and I love it.

I’m deeply invested in this system and don't plan on abandoning it. That said, I want to be honest with potential users:

Ignore the myth that sensor size is irrelevant. Sensor size is a critical factor.

A smaller sensor demands a highly controlled environment, whereas full-frame cameras have evolved to be versatile enough for nearly any light level.

MFT cameras, however, can be difficult to use when lighting is restricted. If you're on a film set with professional lighting, MFT works great. But for weddings, events, or run-and-gun documentaries, it becomes a liability as soon as the sun starts to set—despite its portability.

In my experience, a larger sensor simply buys you more time to shoot as the day fades.

+ I take my GH7 out when dark, anyway. just listen to your heart. Doing whatever you want is always the best way.