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Cross-hatch pattern on Ursa Mini 4k image

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  • Cross-hatch pattern on Ursa Mini 4k image

    Ran into an issue looking at some enlargements of the image on a shoot I did yesterday that show a regular cross-hatched pattern on the entire image. Does not appear to be FPN, it's something else.

    Here's a screen grab:

    46k crosshatch enlargement.jpg

    Dropbox of the above in full resolution because it's very hard to see here in the forum post. (show it in full-screen on dropbox)

    https://www.dropbox.com/s/lfnit698z2...ement.jpg?dl=0

    And here's a tiff of that image. It looks this way no matter what scaling option is used in Resolve (Smoother, Sharper, Bilinear).

    46k sample_1.1.1.jpg

    Dropbox of the above: https://www.dropbox.com/s/uv9nqcadrm...1.1.1.jpg?dl=0

    And finally here's a dropbox link to the 4:1 compressed dng.

    https://www.dropbox.com/s/oeua7w3438...07796.dng?dl=0

    Anyone have any idea what's going on here?
    Attached Files
    Last edited by yostopia; 07-20-2016, 06:46 PM.

  • #2
    It's a debayer/scaling issue in Resolve. If you search the forum you'll find other threads about it and what to change to fix it, someone posts about it every now and then.
    Darren Hartman
    Asyn Film | Banana Stand Media

    Comment


    • #3
      Shouldn't affect rendered deliverables.

      Comment


      • #4
        I've actually read the posts about the debayering issue, and of course I see the obvious screen-door pattern when using the wrong scaling method (for example the optimized scaling method shows the screen-door pattern while playing the video but then it reverts to normal when stopping on a frame). And for me both Sharper and Smoother are fine but Bilinear shows the screen-door pattern.

        But this is showing up all the way down the chain in the rendered deliverables. Here's a dropbox link to the video and it's in there if you magnify it to 300%.

        https://www.dropbox.com/s/cehfnxs14d...grain.mp4?dl=0

        What's really odd is that I sent the dng to a friend and he rendered it out in Rec709 (I'd only been using BMDFilm) and doesn't see the pattern. Here's an example of that:

        https://www.dropbox.com/s/3suh9hf0vn...86513.tif?dl=0

        Will dig deeper into it tomorrow. Very strange.

        Comment


        • #5
          Originally posted by rick.lang View Post
          Shouldn't affect rendered deliverables.
          Rick, it unfortunately is... not sure why yet but will do more research in the morning.

          Comment


          • #6
            Originally posted by yostopia View Post
            What's really odd is that I sent the dng to a friend and he rendered it out in Rec709 (I'd only been using BMDFilm) and doesn't see the pattern. Here's an example of that:
            What else are you doing to the image then? Perhaps it's getting interjected at some stage.
            Cameras: Blackmagic Cinema Camera, Blackmagic Pocket Camera (x2), Panasonic GH2 (x2), Sony RX100 ii, Canon 6D, Canon T2i,
            Mics: Sennheiser, AKG, Shure, Sanken, Audio-Technica, Audix
            Lights: Every Chinese clone you can imagine

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            • #7
              Loaded the DNG into resolve 12.5 - not seeing the issue.

              Are you using the latest version of resolve?

              Where was the screenshot taken from? inside resolve or inside a video playback software?
              Tom Majerski
              Cinematographer / Photographer / CGI Artist / Filmmaker

              http://www.TetraGrade.com
              http://www.imdb.com/name/nm5157752/

              Comment


              • #8
                Got it -


                Go into your project settings:


                Select "image scaling"

                Change the Resize filter from Bilinear to optimize for playback



                On Bilinear I see the effect - on the others, I dont.
                Tom Majerski
                Cinematographer / Photographer / CGI Artist / Filmmaker

                http://www.TetraGrade.com
                http://www.imdb.com/name/nm5157752/

                Comment


                • #9
                  Originally posted by Tom View Post
                  Got it -


                  Go into your project settings:


                  Select "image scaling"

                  Change the Resize filter from Bilinear to optimize for playback



                  On Bilinear I see the effect - on the others, I dont.
                  Pow!

                  Captain Tom to the rescue again!
                  Cameras: Blackmagic Cinema Camera, Blackmagic Pocket Camera (x2), Panasonic GH2 (x2), Sony RX100 ii, Canon 6D, Canon T2i,
                  Mics: Sennheiser, AKG, Shure, Sanken, Audio-Technica, Audix
                  Lights: Every Chinese clone you can imagine

                  Comment


                  • #10
                    Originally posted by DPStewart View Post
                    Pow!

                    Captain Tom to the rescue again!

                    Been busy getting over the past few months, hence my sudden drop in forum activity..... but now I'M BACK!


                    :-p
                    Tom Majerski
                    Cinematographer / Photographer / CGI Artist / Filmmaker

                    http://www.TetraGrade.com
                    http://www.imdb.com/name/nm5157752/

                    Comment


                    • #11
                      Thanks Tom, but I'm familiar with the Bilinear screen door effect and never use it.... always use Optimize-for-playback. What's weird is that this pattern is making its way through debayering all the way to output. Here's a dropbox link to a tiff file of one frame. If you zoom into 6-800% it becomes super obvious.

                      https://www.dropbox.com/s/c4s5l4zx06...1.1.1.tif?dl=0

                      Here's a screenshot of it in Resolve, with Optimize-for-playback scaling selected:

                      https://www.dropbox.com/s/fygue6mo4g...nshot.png?dl=0

                      And here's a screenshot of what it looks like in FCPX at 600%:

                      https://www.dropbox.com/s/1wiq0i98y4...20log.png?dl=0

                      And here's a 10-second clip in ProresLT format of the log file. Load it into any NLE and zoom to 600%.

                      https://www.dropbox.com/s/s7kfunn96l...0clip.mov?dl=0


                      I need to contact US support today about it. The Captain's notified them of incoming.
                      Last edited by yostopia; 07-21-2016, 05:41 AM.

                      Comment


                      • #12
                        Originally posted by DPStewart View Post
                        What else are you doing to the image then? Perhaps it's getting interjected at some stage.
                        That's the thing... nothing else. Although I had FilmConvert on it for the final render, I can see the effect when it's just one node with no edits. Here's a tiff file of just the raw file exported.

                        https://www.dropbox.com/s/c4s5l4zx06...1.1.1.tif?dl=0

                        Comment


                        • #13
                          Check this out:

                          http://tommajerski.com/publicimages/Xhatch.jpg




                          Try setting everything to the top one - see if the issue is still there
                          Tom Majerski
                          Cinematographer / Photographer / CGI Artist / Filmmaker

                          http://www.TetraGrade.com
                          http://www.imdb.com/name/nm5157752/

                          Comment


                          • #14
                            Those are the settings I'm using... here's a screenshot:

                            https://www.dropbox.com/s/r3nnbmlgi7...0shot.png?dl=0 (look at it in full res)

                            Screen Shot 2016-07-21 at 7.05.04 AM.jpg
                            Last edited by yostopia; 07-21-2016, 06:16 AM.

                            Comment


                            • #15
                              Originally posted by yostopia View Post
                              Those are the settings I'm using... here's a screenshot:

                              [ATTACH=CONFIG]20222[/ATTACH]
                              Any chance you could make that image a touch bigger ;-)
                              Tom Majerski
                              Cinematographer / Photographer / CGI Artist / Filmmaker

                              http://www.TetraGrade.com
                              http://www.imdb.com/name/nm5157752/

                              Comment

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