Orash Rahnema

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About Orash Rahnema

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  • Birthday 04/23/1980

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  1. that is pretty cryptic I would say. anything that is possibile to know before the 10th?
  2. as per ruler you mena something that can draw a straight line horizontally and vertically and can be arbitrary moved or do you need also measurement in pixel or centimeters, like photoshop? for the first one with a bit of time I can try to write a dctl since I was kind of tackling something like this already to excercise, I don't know when will be ready tho if you need the second one, then no, i can't do it
  3. Can it be that hue vs Sat works on HSL or some different colour space rhater then the rgb colour space that Sat use. I belive Sat control works in RGB using 709 primaries, not sure about curves, the same nature of them makes me believe they are in hsl. But then again i might be wrong would be interesting to check
  4. Here there is a very interesting tweet about the apple xdr display from Juan Salvo
  5. Hi David there are few things that should be known before giving a proper answer. the only thing contaminated are the black bars or does the image looks more contrasty on your display? a quick things that come in mind is, when the image are desqueeze, the black bars you see are black to start with, but if you really push the level you see that behave like they are part of the image, so if you "pollute" the black with a color cast or the blacks are lifted also the bars will be The solution would be to blank the frame using output sizing or timeline blanking that if there are not other problems that I can't see with the info we have.
  6. Last year I have done a 15 min long short movie, shot on a single long take at sunset hour where the 4 subjects kept going in and out a house, so lots of exteriors and interiors with a massive light change. The DP i have worked with had done a great job "shutter pulling" and that helps a great deal. First thing I have studied how the light was changing and I found a "master shot", then I have found all the places where I could hide the dynamics and balance the whole thing with very simple correction, mostly offset and contrast working with the light changing and not going against it. I have used the layer mixer and create stream for each change I needed Then I have worked on the "look" and placed it within the single streams, to use the dynamics I have done before I have done a general correction after everything also. After all this I have worked with masks and stuff. The key is to keep it as simple as you can, things can become messy quite quick. try to brake it into smaller problems and think it like a multi shot video, that rather to have cuts have dynamics. Choose if you want a massive node tree with a layer mixer like a did or to brake the cut in editing using cross dissolve. I don't like that approach as I rather move keyframes that to jump within cuts and fix dissolves. I hope I was clear enough
  7. no really really sure what you are asking, but using a lut in aces is not a straight forward thing to do and generally not a good idea. you can try to make it work using lightspace but still it's a workaround that introduce many unpredictable factor and can give you nasty artefacts. Most of all if you want to go from an sdr odt to an hdr The lut will clip at 100 nits anyway so it's not going to work To go from an sdr to hdr there are not workaround (not like a trim dolby vision trim that take you from hdr to sdr) The only safe way is to grade it for hdr starting from what you already have, after the lut. in that way you can extend the contrast letting only the very highlight to go above 100nits and keeping most of the signal at a 100 nits where already belong. Also you will have more room to give shadow details, which is really nice.
  8. Red can read cube, as far as I remember, Alexa can't. For the Alexa, depending on the model you have to use, on the Alexa xt you can only use a 1d lut and matrix and if I can recall the format is. Xml. On Alexa mini, Amira, lf and basically all the arri camera after the Amira you can use a 3d lut and the format is. Aml I never had problem with a 33*33 lut but since you have to convert your cube lut into an aml you better reduce it to 17*17 I use lattice to convert the cube into the aml.
  9. I haven't see this movie yet, but after reading the article I must see it asap. Which system was it used to grade it? I'm particularly interested in the oversaturation/desaturate technique. Was it done with a spliiter/combiner? To make it work the signal needs to be clamped someway? I'd love if someone can answer this!
  10. I haven't had the chance to look into it But as a work around you can use the @Paul Dore aces ofx you can basically build your aces pipeline as a node structure keeping resolve color science in yrgb that way you should not have any problem with video monitor output lut
  11. Hi Michael if the lut is placed in the "3d video monitor output" should not give you any problems as it "should" work post ODT. I might be wrong here tho, maybe its not post odt even if sounds very strange. To make a 3d lut working in aces your best bet would be to use lightspace, @Steve Shaw can really help you out here. Check https://www.lightillusion.com/aces_manual.html under "CONVERTING LUTS INTO ACES" section. Lastly, the monitor calibration does have not to be different if you work in aces or unmanaged, since your monitor will still be a 709 monitor. In aces by choosing the ODT you transform from the aces color space to the choosen one (709 for example) and you have to monitor on the same colorspace you choose with the odt I hope it make sense cheers, Orash
  12. Hi Michael the problem is where you are placing your lut, most likely in aces a "normal" lut cannot be used within the node tree, you either convert it to an aces lut, which is not as simple as it said, Otherwise since it is a monitor calibration lut I would suggest it to load it to the "3d video monitor output" in the color managment tab (that should come after the odt, so should not create problems) or straight into the monitor. hope that helps you Orash
  13. Hi all! I'm planning to buy a mini panel and currently bm is giving (in Italy) a 10% discount. It's not a lot, but still isn't bad. Anyway, are there any rumors of a new panel announced after nab? Cheers Orash
  14. Hi all! It's now a couple of months that I have set up my windows workstation. So far everything it's fine, in still getting used to few things but it's running smooth. I'm finding few bugs here and there and I wanted to check was my problem or it's a common issue. For example : In the deliver page, choosing a render folder, when i right click in the explorer/finder window to create a new folder, DaVinci crashes. Once reopened it doesnt happen no more. Anyone else has this problem? Cheers Orash
  15. Hi! I have just tested my new pc with a gtx 1080Ti and trying to export a red clip 8K with a noise reduce I got two errors: "The GPU failed to perform image processing because of an error" "Error Code: 33." "The GPU failed to perform image processing because of an error" "Error Code: 77." I'm using Resolve If I disable in the preferences "use GPU for RED debayer" I don't get the errors but of course it slows down quite a lot Did anyone found a solution for it? cheers, Orash