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Found 3 results

  1. Hi everybody, I'm reading about color sampling and I'm getting a lil confused about the difference between RGB and YCbCr. From what I've understood they are both color spaces, but YCbCr comes handy because full bandwidth RGB signals have a lot of color redundancy and they are not economically efficient for storage and transmission. One of the things I do not undestand is when in cameras happens the passage from RGB to YCbCr. For example, if I'm shooting with a high end level camera like Alexa or Epic what is the color space? And if I have a chence to choose between the two which one should I choose? And another thing, I've seen that in high end level monitors there is a hdsdi input but also different inputs for YCbCr signals, whit differents connectors for the different color components. why is that? Thanks so much in advance for the help, Davide
  2. Hi everybody, I'm trying to really get the difference between RGB and YCbCR. The problem is that I cannot find a consistent answer to this question. From what I know they are both signals. I know that RGB is always a 4:4:4 signal while YCbCr can be subsapled in different ways. I also know that YCbCr is originated by the RGB because this last signak is redundant so (what does ut exactly mean?). I also would like to know the difference between a 4:4:4 RGB and a 4:4:4 YCbCr, don't they both have the maximum chroma and luminance sampling possible? Thanks so much!
  3. Supervising colorspaces in different parts of the chain. As I understand it, Digital Cinema Projections are in P3 colorspace, and TV/DVD/Web is rec.709 colorspace. Then, as for the workflow. Images are captured in colorspace X (depending on the camera/stock) In the DI, images are converted to another colorspace, lets just say ACES In the master the images are then converted into either P3 or Rec.709 depending on the format. My questions are, 1. How do we know which colorspace we are exporting to? E.g. What colorspace does H.264, ProRes422 (HQ) or ProRes4444 have? Can you recommend any places to read up on this? 2. And how do we ensure to keep colors within the intended colorspace, as to not lose out of gamut colors when exporting? 3. I often use a Kodak2383 emulsion LUT when grading which clips out of gamut colors and remaps them to the closest color of same luminance. I suppose the gamut / colorspace is calculating what can be printed to Kodak2383 film. Do you know of any way that I can see / test how wide this colorspace is compared to P3 and rec.709? 4. I work with dailies & grades in photoshop as references for the colorists. Can you recommend a website where to read about color-management in photoshop as to stay within gamut, and 5. Would you recommend any specific image format. DPX, TIFF or PNG etc. for colorspace and accurate color rendition? Thanks guys, Will
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