The Canon 5D Mark I (classic) always had something special in the color rendition.
Hey!
Here is the RGB version of the LUT. It actually brightens 0 RGB, quite interesting.
Hey Dubcat.
Hey man!
I see oddvisionary has been kind enough to answer when I was afk. I would use your sculpting software of choice and Painter.
I would also generate an IOR map from the normal map, since this model would be fictional and not based on specular scans.
You need the IOR map for micro shadowing like here:
Hi dubcat, I got into hdri calibration thanks to your tips thank you! However I would like to somehow calibrate hdri that has partially overcast sun - is that possible in any way? or is it just eyeballing then? for example some of noemotion evening hdris so that the intensity of direct light would be correct
Hey!
If the sun is blocked by clouds and the HDRi provider does not include a grey card reference, we just have to guess. If you give me a link to one of the HDRis you have in mind, I can take a look at it.
If you are interested in getting real world values, you can do this:
- Go outside when it's cloudy.
- Place a ColorChecker grey card on the ground.
- Take a photo of the grey card.
- Recreate the grey color material. If you use a ColorChecker Passport, the grey bellow yellow is 19.8% linear (122 sRGB). (A grey sphere would be best, since you can capture F0).
- Create a camera with the same settings you used on the real camera.
- Calibrate your HDRi until the real and digital color checker match in values.
Before doing that i want to be sure that i won't do any irreversible damage.
Hey man!
My guess is that the HDRis you tested already had low sun values, that are bellow Photoshops clip value. If you add 7 +20 Exposures in Photoshop above a 255 RGB layer. You will go above the threshold and it turns black.
I've attached the Corona Sun/Sky HDRi saved from Corona, if you want to do tests on that one.
edit: fixed typo, i meant specular not spectacular :p