Magic Lantern Forum

Using Magic Lantern => General Help Q&A => Topic started by: Bambix on June 12, 2017, 12:02:12 AM

Title: Pink Highlights on video
Post by: Bambix on June 12, 2017, 12:02:12 AM
Hello there.

I've been using ML for a few months now, and I have to admit that I only use a few features this awesome tool offers.
I've particularly been shooting timelapses with my 6D.
So far everything went perfect, but last week, after shooting another timelapse in the garden, I realised all overexposed regions of the frames were pink.... (see screenhsot)

I must say I didn't really care about it at first, thinking it was just an overlay, but it is captures within the video file.

Can I remove it ? If not, how can I avoid it in the future....

Thanks for reading :)

(http://i.imgur.com/jDZ36Ji.png)
Title: Re: Pink Highlights on video
Post by: a1ex on June 12, 2017, 01:07:15 AM
Upload an unprocessed frame (be it CR2, DNG, single-frame MLV or H.264 frame, depending on what file format you have used).
Title: Re: Pink Highlights on video
Post by: Bambix on June 12, 2017, 03:31:25 AM
I forgot to mention that I used the FPS override option of ML, so the direct output is a .mov video file.
So I can't give you just a frame...
Title: Re: Pink Highlights on video
Post by: a1ex on June 12, 2017, 01:08:51 PM

ffmpeg -i foo.mov -ss 00:05 frame.jpg
ffmpeg -i input.mov -ss 00:02 -to 00:03 -c:v copy -c:a copy one_second.mov


Besides FPS override, have you used other settings, such as strong negative digital ISO?

You can fix the image by mimicking the highlight recovery operation done by most raw processors (which is more of an art than science). Desaturating highlights is one way. In any case, these are overexposed channels, so the only solution is some sort of guesswork (based on the channels that are not clipped).
Title: Re: Pink Highlights on video
Post by: bpv5P on June 13, 2017, 01:04:33 AM
Probably negative ISO, I would say. Values less than 60 ISO gets pink highlights. I would suggest a ND filter... if you need more dynamic range, try MLV recording with dual_iso.