Orash Rahnema

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Posts posted by Orash Rahnema

  1. 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. 

  2. 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





  3. 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


  4. 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? 



  5. 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? 




    • Like 1

  6. 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?




  7. I'm not really a "happy new year" guy but I wanted to take this chache to thank the people behind this forum and the users involved. 

    I have to say lowepost has become a great resource of information and I'm thankful of the help, tips and tricks and info I found here.

    So I wish to this forum and the users a great new year, full of nice info, tutorial and insights. 

    • Like 2

  8. With this estimate time is taken into consideration the "needs" of dop and director or are this "maximum" timing given by budget/production

    I work with a dop (that I really like and we have great relationship) that is not easy to work with, he just doesn't want to stop. 

    He could work on a grade for a whole year if someone doesn't stop him, and I cannot always do that.

  9. Hi all,

    I might have to lend my monitor to another colourist.

    Do you know if is there a way to password/pin lock it so no changes can be made at all?

    I have looked through out the manual and checked other forum but I haven't found the answer i need






  10. Hi all!

    in the colour lounge facebook group a pretty interesting topic was recently diccessed.

    Something that cought my eye was this post from Walter Volpatto.

    I'm not sure if he's part of this forum, here it is:


    In big productions, you almost NEVER stylized a grade: you rely entirely on the set lighting. 

    Of course I could have asked him but I thought it could be useful to discuss it here.

    I'd love to know what's your thought and experience on this. 

    When I see movies that have a very define style, other then art direction, styling and lighting, grading wise are there look created specifically for the show?
    this looks are created by whom? colour scientist + colourist and dops prior the shooting or at the first grading sessions? 
    This looks do they come to the grading room in a LUT form or luts are generally avoided in order to preserve the whole signal and avoid artefacts?

    Well, as usual way too many questions :)




  11. Thanks Bruno. 

    In lightillusion website says:


    Operating System: Windows 7/8/10 
    PC Requirements: Minimal - 2Gig Ram Laptop, with HDMI 
    Mac Operation: Runs on Mac using any Windows Emulation 


    Unfortunatelly the first laptop i tried Met this requirement. 

    Probably It was that laptop's fault anyway. 

    I should try with another One running anche i5 CPU and see if It works

  12. I've checked lightillusion website, i couldn't find the info i needed, otherwise i wouldn't have asked here. 

    I wanted to know roughly what people use as i have tried on a very very modest laptop with an i5 CPU and it was unusable (i think the problem is not the CPU but Just about everything else)

    Right now i'm running It on a Pretty good i7 laptop and It works fine but its an expensive laptop that i have been lendt and i have to give It back. 


  13. Hi all!

    I'll have to get myself a new windows laptop where basically i will only run lightspace and maybe calman if i get a copy of it.

    As I will only need it for this I'll want to spend the least amount of money.
    Would you know what are the minimum requirement to run those software?





  14. 11 hours ago, dermot.shane said:

    i LURVE blue box (and channel box too)  btw... super awesome tools, used every day that i'm on Resolve

    What do you use it for?

    I'd love to hear real world example. 

    I'm scratching the surface of the Matrix potential and i want to really understand what Can be done

  15. 8 hours ago, Thomas Singh said:

    Blur, then sharpen? What do you accomplish with that?

    one doens't reverse the other in this kind of process, the blur node average pixel values, in that way the edges bleeds into each other as well as the rest of the image, sharpening after that micro contrast an image that has pixel values that are closer together, and while it tries to reverse the blur, at the same time the pixels changed from the original image, so a pixel that "belonged" to the bg now seems part of the fg.

    yeah, kind of hard to explain i guess.

    in very small amount it mix the image together and sometimes it's even hard to see the result using such small values, so it's not always worth the hassle, it helps with super sharp lenses.

    a similiar process i used to do to 3d elements when i was a compositor is to add grain and then denoise (before adding footage grain on top again at the end of the composite) that helped a lot to remove the cg feeling out of it

    • Thanks 1