Jump to content

androidlad

Members
  • Content Count

    752
  • Joined

  • Last visited

  • Days Won

    3

Everything posted by androidlad

  1. Sensors work in linear, even if the analog components (photosites) are capable of 10000000 stops, a single 12bit ADC would only be able to produce max 12 stops in digital signal. Sony's IMX490 is capable of 120dB DR, that's achieved by three 10bit ADC working simultaneously. https://www.dpreview.com/articles/4653441881/bit-depth-is-about-dynamic-range-not-the-number-of-colors-you-get-to-capture Have a read and educate yourselves gentlemen.
  2. The Possession of Hannah Grace, shot on A7S II in 8bit, looks gorgeous.
  3. 12bit ADC places an upper limit on the DR, which is 12 stops. Current silicon based sensors work in linear, so 1bit=1 stop. Again, E2's low noise mode engages the 14bit ADC which is a hardware on the sensor, the video files are encoded with 10bit ProRes, which I'd say holds between 12-13 stops DR. ARRI uses dual 14bit ADC to merge into a single 16bit stream, this is mapped to 12bit log for its 14+ stops of DR. It seems that you're confusing linear ADC bitdepth with encoding curve bitdepth which can be log or linear or anything in between (for example, BRAW is non-linear RAW)
  4. It does. sensors respond to light in linear way. 12bit quantisation results in 12 stops of theoretical maximum DR. ADCs have everything to do with DR. That's way ZCAM E2 has a low-noise mode that takes advantage of a 14bit ADC. 16bit ADC do exist but the framerate is in single digit at the moment.
  5. Do you know what ADC is? ADC bitdepth directly determines how much DR can be extracted from the sensor. Sony sensors use single 12bit ADC for video. The new BMD 4.6K G2 uses dual 11bit ADC, ARRI uses dual 14bit ADC.
  6. It you're solely talking about video then DR is between 11-12 stops, since the moving picture readout drive mode is limited to 12bit ADC. Panasonic S1 lab test exceeded 12 stops, but it's really just heavy NR cheating the charts, which don't reveal detail loss in real world shooting scenarios. 10bit log encoding can efficiently store up to 16 stops of dynamic range, that's why most film scans have been using 10bit cineon format.
  7. Decoding a BT.709 YCbCr signal using BT.601 and BT.709 matrix should produce two different results, so, if Scratch was truly respecting the tags, internal and external should look different. Of course this is all based on the assumption that the camera originated YCbCr data is the same between internal and external.
  8. Interesting. Why do you think internal files and ProRes file match in Scratch despite one uses BT.601 matrix and the other uses BT.709 matrix?
  9. were you able to change metadata tags for both stream and container ? What does ffprobe say for the altered file?
  10. BBC already published a tool to change colour metadata and I tried it, it didn't work because all it does (including recent ffmpeg builds) is changing the metadata tags at container level (QuickTime), while the actual metadata tags are also present at stream level (H.264/H.265), to change metadata tags at stream level you might need to go extremely sophisticated with hex editor.
  11. This sensor. With dual 11bit ADC, it behaves similarly to ARRI's ALEV III. ltn4625.pdf
  12. The reason is that current mobile phone sensor interface - MIPI, doesn't have near as much bandwidth/lanes compared to SLVS-EC.
  13. It happens with all fuji camera internal H.264 and H.265 files, with the exception of HLG.
  14. The latest Adobe Premiere Pro/Media Encoder support ProRes output on Windows now. But they interpret colour from Fuji cameras wrong. Assimilate Scratch also outputs ProRes and gets the colour right.
  15. Anker uses c to c for the PD port, you can get spare ones from Anker.
  16. If you get that Anker power bank, it comes with usb c cable.
  17. If the green charging light is on while your camera is on, then it's a PD source. With regular 5V the green charging light goes off as soon as you turn on the camera.
  18. Yes but it must be calibrated with an X-Rite i1 Display Pro via its hardware 3D LUT slot.
  19. Sounds like the typical full range vs limited range issue, just drop a Lumetri level mapping preset on the prores file and you're grand.
  20. Yes, charge only while it's off. OP wants to power the camera which requires 9V to operate.
  21. X-T3 can only be powered by USB with Power Delivery, that's 9V instead of regular 5V USB. You can only find PD on certain chargers and power banks.
  22. There are BT.601-BT.709 3D LUTs that fix it, but not worth the hassle, especially if you grade with other LUTs on top. Assimilate Scratch is immune to this and shows the colour correctly.
  23. Just get a Ninja V and be done with internal recordings. Because all internal files are tagged with SDTV BT.601 transfer function (with the exception of HLG files), it causes some NLEs to misinterpret the colour, causing red turn bright orange and dimmer green.
  24. It's fully compliant with BT.2100 spec, which uses BT.2020 gamut.
×
×
  • Create New...