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9 votes
Accepted

Leaving white balance for post-processing. Is it a bad idea?

Don't do white balance in post, you will regret it. The problem is that the footage your camera records is compressed. That means the sensor information is not stored in RAW, but encoded using lossy ...
MoritzLost's user avatar
  • 5,442
5 votes

What is the colour range of most videos?

Most videos are limited range i.e. luma goes from 16 to 235, and chroma from 16 to 240. Unless expressly set, FFmpeg does not scale the range from one to another. Whatever the source is, that's the ...
Gyan's user avatar
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4 votes
Accepted

Why are there so many color spaces available?

There are a number of reasons why there are so many color spaces: Color resolution - sRGB and similar color spaces only cover a portion of the visible spectrum. This means that they can be ...
user1118321's user avatar
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3 votes
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Color correct to compensate for low blue

I am not very certain that I understand your question, but if you want to shift the color-grade of your image away from the orange, you can use the temperature to shift it towards blue, effectively ...
Florian Claaßen's user avatar
3 votes
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Is wide-gamut video primarily an increase in saturation (for the layperson)?

Wide Gamut color space is primarily just an expanded color space that is capable of covering a larger range of values in the visible color spectrum. This, compared to sRGB and Adobe RGB. The gamma ...
McFlySoHigh's user avatar
  • 2,487
3 votes

Software used for Film Colourization

From the youtube video description you linked: The in-house developed and customized cutting edge software tools provide better image quality and colors very close to the original.
AJ Henderson's user avatar
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2 votes
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How can I generate a color-correct h264/MP4 from a DPX sequence using ffmpeg?

I followed up on the yuv420p(tv, bt709) portion of the encoding and discovered that this refers to the Rec. 709 colorspace for HDTV. In ffmpeg, colorspace is defined by the colormatrix filter. However,...
lofidevops's user avatar
2 votes
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How to change every black pixel to a special color?

You can use the LUT or GEQ filters for this. e.g. with LUT ffmpeg -i myVideo.avi -vf "yadif,format=rgb24, lutrgb=r='if(eq(val,0),3,val)':g='if(eq(val,0),3,val)':b='if(eq(val,0)...
Gyan's user avatar
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2 votes

Software used for Film Colourization

When colorizing film, filmmaker's will use a variety of commercial and custom developed tools. That mix of tools is often treated as proprietary information and is not widely discussed. For example, ...
Michael Liebman's user avatar
2 votes

How to read 10-bit RGB values from HDR video?

The ProRes input will have YUV encoding, not RGB. If you need a raw dump, save as rawvideo. ffmpeg -i in.mov -f rawvideo raw.yuv Note that bit depths which aren't multiples of 8 are still stored in ...
Gyan's user avatar
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2 votes
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Why a color grading suite needs high CRI lamps?

The truth is that you do not need them... unless you do of course. You only need good CRI for the ambient lamps if you need to compare colors with real-life things, probably the skin tone of someone, ...
Rafael's user avatar
  • 1,182
2 votes

Manual white-balance for non-neutral lighting

You're doing it wrong. For one, the 18% grey card is for exposure, use a white card for white balance. For two, the whole point of the white / grey card is that you expose it under the lighting ...
stib's user avatar
  • 13.7k
2 votes

Should color grading be performed on raw clips, or final sequence?

Grading multiple clips in Premiere is still a bit fiddly compared to something like DaVinci Resolve. If it was only three clips, I would do the grade on one clip, then copy and paste the Lumetri ...
tomh's user avatar
  • 7,943
2 votes

How do I get a totally consistent white tabletop background?

That's interesting. Just tried it with locked AF/AE in the camera app as you showed, and it definitely is adjusting the white background even though the focus and exposure are supposed to be locked. ...
tomh's user avatar
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1 vote

YUV to RGB/sRGB color space conversion using ffmpeg

ffmpeg -y -i output.mp4 -c:v libx264rgb output_264.mp4 Output #0, mp4, to 'output_264.mp4': Metadata: major_brand : mp42 minor_version : 0 compatible_brands: isommp42 encoder ...
xer-rex's user avatar
  • 817
1 vote

Which color space to use in camera while shooting video? RGB or YCbCr?

The question is impossible to answer in a general way. If a camera offers to record in RGB, it is likely using a completely different codec that could be better or worse. Very few cameras will ...
wrosecrans's user avatar
1 vote

Manual white-balance for non-neutral lighting

I think your eyes acclimatise to the ambient colour temperature in the room, so one tends not to notice that whites are looking warmer under incandescent light, unless there is a cooler light source ...
tomh's user avatar
  • 7,943
1 vote

Even out fluctuating exposure on old video

You could try GBDeflicker to see if it improves the footage. They have a free demo. It is designed for smoothing out time-lapses (and is good at this), but it might work on archive video?
tomh's user avatar
  • 7,943
1 vote

Is 8 Bit 4:2:0 chroma subsampling "good enough" for chroma key?

Four big factors in your results... About 10 years ago, I was using HDV, which is not only 4:2:0, but is actually 1440 pixels wide, stretched to 1920 wide. At the time, I wasn't always happy with the ...
Wayne's user avatar
  • 156
1 vote

Is 8 Bit 4:2:0 chroma subsampling "good enough" for chroma key?

"Good enough"? Sure. I wouldn't love to work with subsampled footage for keying, though. You want to maximise resolution, minimise or avoid subsampling and avoid spill. If your screen is ...
Florian Claaßen's user avatar
1 vote

How to manage colour in After Effects to get precisely a desired colour in h264 output

Since I cannot use hyperlinks in comments, here is the gist of my research: This answer on a reddit post suggests, that the reason for the color-shift is the way illegal and legal colors are handled. ...
Florian Claaßen's user avatar
1 vote

How to clean up old animated footage?

The artifacts are on the original footage because a DVD used some oldie MP2 codec, you need to live with it. You could try using a denoiser, some of them can detect compression artifacts. I am not ...
Rafael's user avatar
  • 1,182
1 vote
Accepted

Why would an ENG camera need 422 Chroma?

As far as I understand, before broadcasting, your signal will be converted and changed which leads to further loss. So by providing 422, the broadcasting company has more leeway to convert/compress. ...
Timothy Lukas H.'s user avatar
1 vote
Accepted

What is the file size difference between 8 bit and 10 bit raw video?

Instead of 8 bits per every channel and per every pixel you need 10 bits, which is 25 % increase of the raw footage. Since the size of 8-bit raw footage is as such huge enough, 25 % of it is high ...
MarianD's user avatar
  • 1,574
1 vote
Accepted

Difference between 10bit 4:2:2 and 10bit display panels

The bit depth and the sub-sampling method are related but different parameters of the imaging system. As you noted, the bit depth determines how many different colors the system can display. The more ...
Michael Liebman's user avatar
1 vote
Accepted

Histogram measurement in single spot

Using ffmpeg, a free command-line tool, you can do ffmpeg -i in.mp4 -vf "crop=1:1:234:541:exact=1,tile=50x10,format=rgb24,histogram" out.png A series of filters are run on the input video. The crop ...
Gyan's user avatar
  • 33.4k
1 vote

Histogram measurement in single spot

The first thing I'd be looking at is Processing. There's a library that lets you read video, there's an example here that shows how to to sequentially grab frames from a video. Then (instead of ...
stib's user avatar
  • 13.7k
1 vote

How to post-process an image to turn trees blue and a face yellow?

There are multiple things going on between the before and after image. The first aspect is a color space conversion. The original image is recorded in a "log" color space. A log, or logarithmic, ...
AJ Henderson's user avatar
  • 19.4k
1 vote

Premiere Pro CS6: how to change color of a clip as time progresses?

There are several ways to do this. The basic idea is always the same: You overlay a color and then animate it's hue. To get rid of all other color, you can either convert the footage to black-and-...
MoritzLost's user avatar
  • 5,442
1 vote

Why is YouTube and VLC making a slight but noticeable mess of my video background?

This is a problem that drove me crazy... Long story short; certain browsers; whether it's Chrome, Explorer, Firefox, etc, actually handle color profiles, embedded within the video file (such as color ...
McFlySoHigh's user avatar
  • 2,487

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