Thread: Quick question concerning Impulz LUTS, and all LUTS in general

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  1. #1 Quick question concerning Impulz LUTS, and all LUTS in general 
    When applying a LUT to your footage (BMCC in my case) is it best to color correct the footage before applying the LUT?, for example I notice in some of my footage I get a slight green cast to the footage (I think this may be due to the particular lens we are using) so is it best to balance out the image before applying the LUT? I assume yes, but Id like to hear your guys opinions
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  2. #2  
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    Quote Originally Posted by Ulysses Adams View Post
    When applying a LUT to your footage (BMCC in my case) is it best to color correct the footage before applying the LUT?, for example I notice in some of my footage I get a slight green cast to the footage (I think this may be due to the particular lens we are using) so is it best to balance out the image before applying the LUT? I assume yes, but Id like to hear your guys opinions
    Before the LUT. I always apply the lut to the last node/layer and do all my corrections on an intermediate node/layer that lies between the original footage and the lut. LUT's clip values and placing it before corrections can cause some values to be clipped. For example if you have a shot inside with a bright window and you apply a LUT that takes the BMDFilm and converts it to Rec709 and that in turn blows out the window. If you correct after the LUT in try to bring detail back in the window you will find that it has been lost and in not recoverable, place the correction before the lut and you can bring it back with no problems.

    The same hold true for filmconvert. I have seen lots of suggestied workflows where people use filmconvert first thing on the footage and grade after. I have confirmed myselft that adobe software and resolve will clip data when using filmconvert despite what others may tell you. Just in case you ever decide to go down that route.
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    Senior Member Adam Roberts's Avatar
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    It really depends on what the LUT is intended to do. With "Creative Look" LUTs which have recently become so popular it's better to balance the shot (exposure and whit balance) before applying the LUT. One way of doing this is to set the LUT on the 2nd node after a correction node. However it's sometimes better to place the LUT on your output (do this in your project prefs) and then do all your grading under the LUT. This means that all your corrections, keys, etc are all processed before the LUT is applies but you will see them with the LUT applied.
    Adam Roberts
    www.adamroberts.net
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  4. #4  
    Thanks for the responses, much appreciated!
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