Texture colours off

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    Rafal

    Your input files are tiff saved as 16 bit or 8 bit ? 
    Does exported texture have as well wrong colors ?

  • Avatar
    Sergio from Rendergon Limited

    Hi Rafal,

    I'm exporting at 16bit, and unfortunately yep, the exported texture also shows wrong colors.

     

    In the meantime I have also tried with texturing style Photo-consistency based but the results of the color continue to be off.

     

    Thank you for your help, Sergio

  • Avatar
    Rafal

    hello Sergio 

    If you use 16bit inputs your images are tonemapped to 8bit and during this process colors may change -  this is bug on our side. 

    We have integrated custom HDR/16bit to 8bit tonemapping algorithm for better alignment and meshing (experimental).
    In previous version a default conversion provided by your CodecPack was used that was often not optimal for alignment and meshing. 

    That means that you need to convert your 16bit images to 8bit in your preferred way outside of RC and use them for texturing. We always recommend to do that as 8bit images are much smaller and RC can process them faster.

    This will be fixed in future release.

  • Avatar
    Sergio from Rendergon Limited

    Thank you Rafal, I'm testing 8-bit though alignment now fails when moving from 16 to 8 haha!

    A bit more fiddling and hope to get there :)

    Cheers, Sergio

  • Avatar
    Sergio from Rendergon Limited

    Thank you Rafal, using 9-bit worked so much better.

     

    Can I please get your two cents whether this is the best colour match I can hope for or are there other settings in RC I can play with?

    The output seems a bit dull quite noticeable at render. A quick comparison shows output Brightness level is some 8% lower, RGB 10-20 points lower.

    Thank you for your help, Sergio

  • Avatar
    Rafa CR

    There are no color settings withing RC.
    Your texture is calculated based on colors from your input images. 
    Therefore it is the best to edit your images before processing within RC. (Some users use color checker targets to calibrate images before processing)

  • Avatar
    Sergio from Rendergon Limited

    Hi Rafa,

    Apologies for the late reply, we wanted to make a few tests before responding. Yes we had processed the images before loading them to RC.

    Instead of using Optimal Texel Size at Unwrap and Texture, we used Custom at 0.002 (the model in RC is 21 units wide by 41 long). We are very pleased with the result, but of course it took 4x to bake. 

    Can we please ask for your invaluable help to clarify our result , this helps us speed up our future baking results:

    - what does a resulting texture quality 689% mean? If I understand correctly, 100% is 100% resolution, how can we get >100% res?

    - And if the result shows Optimal Texel Size =0.137 units per texel, what does this tell us if we were to bake again, does it mean we would be wasting computer resources if we bake at a texel size below 0.137?

    - Unwrap Maximal texture resolution: we used 4k maps and ended up with 48 textures. Is our understanding correct that if we increase map res to say 16k that would not hamper our results, it would just reduce the number of textures we'll have?

    Below texturing results:

    Thank you for your help, Sergio

     

  • Avatar
    Götz Echtenacher

    Hi Sergio,

    all your latest questions have already been discussed at great length!  :-)

    Just type in the keywords in the search bar....

     

    How did you process the images so that the colours are finally working for you?

  • Avatar
    Sergio from Rendergon Limited

    Hey Gotz,

    Thanks for reaching out. I'll go back to the vast well of wisdom to regather on these discussions, if you have any particular links you think is clear is of course much appreciated.

    We didn't reprocess them, that's why reached out to ask. We used the existing processed images, but this time instead of using Optimal Texel Size (0.13782) at Unwrap and Texture, we used Custom at 0.002 (in both cases Fixed Texel Size style) though it took 4x to bake (resulting count of textures increased from 2 to 48).

    We reprocess these final textures so the extra unused texture space (0.13782/0.02=689% is the texture space and computer processing power we're wasting right? ) hopefully doesn't affect the final render.

    Cheers, Sergio

  • Avatar
    Götz Echtenacher

    Hi Sergio,

    I agree the search engine here on the forum is a bit of a pain.

    First hit with "Optimal Texel Size" is: https://support.capturingreality.com/hc/en-us/community/posts/115001490772-The-secret-of-the-Texture-Quality-value-

    Hope that helps a bit.

    That means with your almost 700% you have a much higher texel resolution than theoretically possible.

    What puzzles me is that the results seem to differ so much in the color, which should not be the case at all in my view...

  • Avatar
    Sergio from Rendergon Limited

    Thank you Gotz, that's very helpful.

    It's early days for me with RC and I may have taken a misstep somewhere. Else I'm quite sure this will come up again in future scans would come back to the community with findings :)

    Cheers, Sergio

     

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