URSA Mini 4.6 - Repro Case| Sensor Bug -Magenta Edge Shift

The place for questions about shooting with Blackmagic Cameras.
  • Author
  • Message
Offline

Chad Campbell

  • Posts: 15
  • Joined: Sat Apr 02, 2016 2:04 am

Re: URSA Mini 4.6 - Repro Case| Sensor Bug -Magenta Edge Shi

PostSun Apr 17, 2016 1:45 am

Lee..I believe you...I don't believe tech support that keep telling me the images look great...its getting a bit insulting. I have 20 years experience in this and its an insult to my intelligence to keep beating that same drum...however, when I spoke over the phone with blackmagic, they told me that they definitely looked wrong...so I am essentially getting 2 different stories from the folks at BM...Im sure they are in defcon 4 over this so I want to be understanding...I am sure they will resolve it...but the dishonesty makes me a bit concerned...appreciate your feedback!
Chad
Offline

Lee Jackson

  • Posts: 130
  • Joined: Fri Mar 14, 2014 3:09 pm

Re: URSA Mini 4.6 - Repro Case| Sensor Bug -Magenta Edge Shi

PostSun Apr 17, 2016 3:14 am

You never want to be in the position to make excuses to a client or have to explain anything.
Anyone can see that this is not acceptable.

I don't see how this can be questioned about being an issue or not.
Like I said my big ursa has an even image. All it's lacking is maybe 4.6k and like 15 stops with global. ;)
Offline

Morten Carlsen

  • Posts: 176
  • Joined: Sun Dec 09, 2012 9:09 pm

Re: URSA Mini 4.6 - Repro Case| Sensor Bug -Magenta Edge Shi

PostSun Apr 17, 2016 10:13 am

Chad Campbell wrote:My images look like this in most cases...however, every dng I have sent to tech support keeps coming back as fine...I do not this this is right...here is one that I know has issues...can anyone please tell me if this is normal..after 20 years of working with video and film..I have not seen this before.
Thanks!
Chad

https://www.dropbox.com/s/hj0hhv1o4sqnh ... 1.dng?dl=0


Hi Chad,

with all that white in a room like that it would have been impossible to get an acceptable result with my camera which is undergoing an RMA.

I downloaded your image and did a quick neutralization of the white background. I was going for a clean white not a natural warm white.

It was impossible for me to achieve an acceptable result with temperature sliders only. Which is alway going to be the standard by which I measure. However, resolving to using a more advanced technique involving alteration of the matrix and thus inevitably a slight shift in color representation/saturation - was able to neutralize for a clean white background.

Now, I am NOT able to achieve a remotely similar result with my camera which HAS been labeled "RMA" and while I was not present in that room I have no idea as to whether the colors are off. However, while the results in the initial frame were exhibiting a magenta color cast - on a Matrix level it was possible to neutralize.

On a second note, I don't think people should have to resolve to matrix ops. to be able to de-cast an image. But those are two diff. topics.

1 - being an impossible to remove non-uniform lateral color shift: Hardware Issue
2 - being a possible to remove uniform color cast: Software Issue (Matrix Calibration)

Prior is an RMA case - Latter is a firmware fix.

First image is normal second employs a power function which should (if present) reveal any hardware non-uniform issue.

chad_norm.jpg
chad_norm.jpg (554.76 KiB) Viewed 1080 times



chad_power.jpg
chad_power.jpg (528.73 KiB) Viewed 1080 times
Previous

Return to Cinematography

Who is online

Users browsing this forum: No registered users and 35 guests