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gstudios
Participant
June 18, 2017
Question

HDR save / colour profile

  • June 18, 2017
  • 1 reply
  • 685 views

I am trying to save a .hdr file with a colour profile in Ps. The option is greyed out in the save window - is there a work around for this?

Also, when I edit the exposure of the .hdr file and save, the exposure edit does not stay with the image. I reopen it in Ps and the exposure has gone dark again, even after 3 or more exposure edits / save.

My goal is to use actual .hdr files with excellent exposure settings and colour profile for 3D rendering.

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    1 reply

    Mylenium
    Mylenium
    Legend
    June 18, 2017

    The HDR format has no such settings nor do I see how it is even relevant for a 3D workflow. The whole outcome of how your image is used is solely defined by the 3D apps internal settings and how they influence the ray evaluation and thus traditional image exposure becomes utterly meaningless in the first place. Even if you tweak it to perfection in PS it still could look rubbish as a 3D texture. Same for color profiles. Why would you even want to reduce the Gamut and destroy your float colors? If you wanted that, then you could just as well convert it to another image format. I'm afraid what you want makes absolutely no sense.

    Mylenium

    G
    gstudiosAuthor
    Participant
    June 19, 2017

    My understanding of the .hdr format is obviously limited.

    The most serious issue I have is that my exposure edits in Ps are not permanent and when I bring the .hdr into Raylectron, the image appears quite dark, and renders way too dark as well. It also looks much darker than I have edited it, just viewing in bridge.

    My colour profile issue is that when I use an .hdr in Raylectron v.4, as a static image (not spherical), the colour looks to be red shifted like an ADOBE RGB 1998 profile (before and after render), rather than a wider gamut like ProPhoto which is able to display more colour info in the cyan spectrum, etc.

    Mylenium
    Mylenium
    Legend
    June 19, 2017

    I still don't understand what you are trying to say. None of this has anything to do with the HDR format nor any color profiles. These are settings you handle inside the renderer. I'm sure even a plug-in renderer for Sketchup has respective controls for whitepoint and al lthat good stuff. At the same time if all you want is flat surface textures that aren's supposed to illuminate anything, then conventional 16bit TIFFs or whatever will do just fine and for all intents and purposes those can include any of your corrections by flattening them/ merging the adjustment layers.

    Mylenium

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