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Messages - philipb

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16
Oh wow....

This is fantastic information....Thanks Dubcat!

I just have one or two questions. Im trying to lock all this down in my mind, and have been reading everything I can get my hands on. I'm shooting my own textures, I have a Macbeth and have been experimenting with cross polarization. Im very happy with the results, but still may questions.

1) You use the term linearize. I have seen others use the same term in reference to texture/Albedo, but not sure we are all using it in the same way when it comes to texture processing (nothing to do with LWF or gamma). Some seem to mean just A) basically that lightroom/camera RAW is at all its default settings? Others B)  the idea of bringing the grayscale of the Macbeth chart into their proper luminance ranges, with the targeted adjustment tool?

Im mainly asking as Im curious exactly what 3d LUT does in this area? Its like a raw image processor that will do all this adjustment work for you ( in the sense of adjusting luminance rages)?


2) This bring me to the part where I'm finding very little information. The inbuilt (nikon for me) tone curve of our cameras.

Now I know this may not be important, but, I wish i could develop a DNG profile from/for my nikon that was Truly 'linear'. It seems that there is much contrast added to the .raw images somewhere in the camera image processing. I have begun to think of the process of adjusting the Macbeth grey scale patches as removing this inbuilt tone curve.

Does this make sense to anyone else or am i just imagining things? If our cameras had a truly liner/neutral response wouldn't our photos come out a lot closer to the 'linearized' (luminance adjustment) adjustments we make to our textures? I find when I'm adjusting my images to fit the proper Mcbeth luminance range that i am always making very similar adjustments, some how its an inverse S-curve. Always with a very steep dip between the first and second white patches. Am I wrong in thinking that I'm fighting the Nikon tone curve? If so is there a way to remove it more automatically without buying 3d LUT ?


Also, some other thoughts......I use a very similar aproach to you for adjusting the luminance patches in a targeted manner....however after setting my basic black and whit patch in ACR I go into photoshop and use a 1 curves adjustment set to color blending mode, then a second set to luminosity blending mode. In the first I white balance each color range with separate rgb curves, in the second I adjust the luminance...I found doing it all with a single curve adjustment was messing with my colors. Specifically because correcting for the nikon tone curve (weather or not my thinking is correct) Involves some pretty steep corrections for the second patch, and getting the luminance right meant my colors would start to go loopy.

This is of course time consuming, so if 3d LUT will take care of this work that would be great. Is that in fact what it does?

Okay guys, also full disclosure, I haven't tried corona, though I can see people are getting fantastic results. I just found my self reading on the forum as there are so many great discussions.

PS. the thread showing the curve response of all the 3ds max adjustments was brilliant.....ahhh the mysteries are unlocked....too bad it was mostly bad news...hehe




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