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Photoshop: Make/Create Color Lookup Tables (CLUT/3DLUT)

I'm certain a lot of people would agree that this would be a very popular and often used feature, if we could extract or create a color lookup table from an image rather than only being able to us supplied lookup tables. Thanks.
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  • Chris Cox (Sr. Computer Scientist) April 02, 2013 20:06
    Which formats are you looking to create?
    Which apps do you plan to use them with?
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  • Hi Chris,

    Thanks for responding. I wouldn't want to rule out other applications, possibly Illustrator and some other Adobe apps, and other image/paint apps, but primarily within Photoshop.

    As for formats, read below and I think you'll understand...

    As we know for many years now you have been able to save a lookup table from within Photoshop, by first converting the image from RGB or CMYK to an Indexed image, reduced to a 256 color palette or less, most commonly using a system palette or for web compression, etc. After converting to Index.. under Image>Mode the Color Table menu becomes active and from there you get a dialog box that lets you see, load or save the current lookup table. However it's in an ".act" format and not the .icc format (if I'm correct,) that the new lookup table adjustment layer works with.

    Since I'm an artist and the desire to map lookup tables to other images is far less demanding than say, a professional photographer or film colorist who would need all the features and power of Speedgrade, I'd rather not have to tackle the learning curve of Speedgrade to do this; especially since I do a lot of my work on a 13" Macbook Pro and Speedgrade's interface barely fits on the screen. I do understand from a marketing and target industry sector standpoint it's probably understandable for Adobe to segment it that way and say, if you want to create LUT's, do it in Speedgrade.

    I've done a fair amount of searching on the net and have found a few third party apps and some filters that help you create color lookup tables. That may be my solution. But it would be really great if there were some way to be able to create and save lookup tables from within Photoshop somehow, without having to convert it to an indexed image, losing a lot of color depth information, and be able to apply them using the new lookup table adjustment layer technique.

    Thanks for listening!

    p.s. I've tried saving a .look file from Speedgrade and applying it from the adjustment layer by loading it rather than choosing one of the included tables, but nothing appeared to happen (in Photoshop CS6.) If anyone knows of a link with info or a tutorial on how this might work, that would be great to know about.

    Mark
    • Chris Cox (Sr. Computer Scientist) April 03, 2013 00:58
      Illustrator can't use 3DLUTs (Color Lookup tables)
      Most of the people using 3DLUTs are in film and video.

      And the indexed color tables (a 1D LUT) bear no relation to the Color Lookup adjustment and 3DLUTs.

      So you just want to use them within Photoshop and don't know much about using them in other applications. OK, still a useful request.
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  • Yes, I think, still a useful request. I have images, whose color lookup tables I'd like to apply to other images. I would think other people would find this very useful, aside from those who want or need the greatly expanded features of Speedgrade.
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  • Hope it may be useful for some members - free Color Lookup presets and profiles

    Color Lookup presets

    but wondering if someone can help me understand 3dls & 1dls format. I have no clue where to search the information.
    Thank you!
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