ImageThat Posted January 12, 2014 Share Posted January 12, 2014 Hi, This is a 1:1 crop from a single video frame using 5D Mark III with Magic Lantern at 1080P 24fps. Can anyone tell me if this level of aliasing on diagonal lines is normal? I can dial down the sharpening to make it less pronounced, but is there anything else I can do? I never thought to try capturing the same scene with an MOV canon file so I can't say if this has anything to do with ML. Thanks. Quote Link to comment Share on other sites More sharing options...
Julian Posted January 13, 2014 Share Posted January 13, 2014 Which rawconverter are you using? Try another one, results could be different... Quote Link to comment Share on other sites More sharing options...
ImageThat Posted January 13, 2014 Author Share Posted January 13, 2014 I am using raw2dng followed by Adobe Camera Raw. Quote Link to comment Share on other sites More sharing options...
maxotics Posted January 13, 2014 Share Posted January 13, 2014 To further what Julian said, the "debayering" method you use will give slightly different results. Amaze instead of bicubic, say. Also, bayer sensors have alternate rows of red,green, red, green... / green, blue, green, blue... so that's image, where red and blue colors are separated, will create rows of missing red or blue values. They will be interpolated from neighboring values which will be wrong and will lead to the aliasing. In short, I believe you're only looking at a rare occurrence of bad aliasing because of the colors, light strength, object, etc. If you did shoot in MOV the aliasing would be less noticed, but the color a bit smeared. Quote Link to comment Share on other sites More sharing options...
QuickHitRecord Posted January 13, 2014 Share Posted January 13, 2014 I've been using Davinci Resolve 10 Lite and haven't seen any significant aliasing with my 5Dii ML raw footage. Quote Link to comment Share on other sites More sharing options...
hmcindie Posted January 13, 2014 Share Posted January 13, 2014 That looks more like 4:2:0 material. Are you converting it to what? Quote Link to comment Share on other sites More sharing options...
ImageThat Posted January 13, 2014 Author Share Posted January 13, 2014 Thank you for the replies. I see this aliasing when I open the DNG file with Adobe Camera Raw, so there is no codec and no color subsampling at that point. I am curious about the debayering: I was thinking that the data would already be debayered and binned in the camera by Magic Lantern to get down to 1920x1080 before writing the RAW file to the CF card. I imagined the RAW file contained 14bit RGB pixels. Is that not how it works? Quote Link to comment Share on other sites More sharing options...
ImageThat Posted January 14, 2014 Author Share Posted January 14, 2014 Just to follow up, one of the posters helped me by converting one of my frames using Divinci Resolve (Thank you for the help!) and we saw less aliasing. It is still present though. I had one other thought, I have my camera set to IPB. Would All-I possibly make any difference? Quote Link to comment Share on other sites More sharing options...
Administrators Andrew Reid Posted January 15, 2014 Administrators Share Posted January 15, 2014 The 5D Mark III isn't entirely aliasing free, so some can be expected. But is sharpness turned all the way down in camera raw? That will help reduce it. Quote Link to comment Share on other sites More sharing options...
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