Xrite Color Profiles ?

Started 10 months ago | Discussions thread
ggbutcher
ggbutcher Senior Member • Posts: 1,342
Re: Xrite Color Profiles ?

Lbs26 wrote:

Iliah Borg wrote:

SigZero wrote:

Iliah Borg wrote:

Lbs26 wrote:

Hello !I've bought today a Xrite Color Checker Passport,i wanted to create my own custom profiles using the Xrite ''ColorChecker Camera Calibration Software''.

I made 1 Daylight profile and 1 Daylight Shade profile,they work fantastic !

Now the question is...should i make 1 night and 1 blue hour profile to cover almost every scenario ?I am talking mainly for landscape photography...i know that i have to create also Tungsten,Fluorescent light...but mainly i take pictures of nature,so Sunrise,Sunset,Daylight,Blue hour and Night.

Good profile and exact colour balance kill the light. That's good for reproduction and documenting experiments, for forensics, but not necessarily good for art.

If you want to preserve the perception of colour of the blue hour, consider an option not to neutralize it fully.

Xrite software creates profiles which are more reproduction ones than general use - I never liked colors comming out of them in classical landscape photography.

Maybe that's because you are applying them together with non-linear rendering.

I've found that Lumariver (which is GUI for free dcamprof) created much more natural profiles out of colorchecker targets. Probably due to nice-for-human-eye color shifts.

Br, Pawel.

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My photo-blog: http://pawel.online

What means non-linear rendering ?I am not familiar.

"linear" refers to the original light measurements captured in the raw file.  Sometimes called 'scene-linear".  Usually looks dark and/or dull.

"Non-linear", obviously, refers to a departure from scene-linear, through some kind of tone transform, or "curve".  This almost always has to be done to a raw image to make it presentable, having to do with the non-linear response of human vision

I think Iilah is referring to the condition where color and/or tone modifications are made after the linear-to-perceptual tone transform has been applied (correct me if I'm wrong...)  You see, all these tone curves applied to an image in the RGB space start to separate the individual values of the pixels, introducing color shifts.  The current school of thought about this is to apply aesthetic color and tone operations before the lift to perceptual, thus minimizing the color shifts.

That's the big hoo-hah behind the recent darktable revisions, changing from "display-referrred" to "scene-referred" editing.  The movie industry is well-behind such; it's ACES specifications and workflow support this thinking.

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