True Linear Point Curve for Lightroom/Camera RAW?

Aloha, does anyone know how I could obtain or create a "True Linear" point curve for LR or ACR? "Linear" is now basically the old medium contrast selection and I would like a true linear one as well for how I like to edit

Canon_Shoe wrote in post #17744797
Aloha, does anyone know how I could obtain or create a "True Linear" point curve for LR or ACR? "Linear" is now basically the old medium contrast selection and I would like a true linear one as well for how I like to edit

Michael Frye, in his book Landscapes in LR, says that the default contrast curve applied by LR/ACR can be cancelled by setting Basic/Contrast to -33. What the equivalent point curve would be is almost impossible to say because the curve applied at Contrast = 0 is content aware in P.V. 2012.

At Exposure = 0 there is a hidden exposure bias applied according to camera model. You can find out what it is by making a Raw to DNG conversion where it is listed in the metadata.

That's funny, because I've been setting contrast to -30 to compensate I don't remember how, but I had a true linear curve on my old laptop I used to use before it crashed. I remember reading that section of Michael Frye's book and he was saying that it usually bumps up the exposure around 1 stop at Exposure 0 to look better as a default in the current version. Very strange how that works.......

You can probably make your own DCP using the DNGEditor to remove the ACR tone curve, set it to linear and remove the baseline exposure. By linear, I assume you mean an image where a 1 stop change in exposure doubles (or halves) the RGB pixel value. You can use Fnord's "Magic Export" to export the image as a 16bit OpenEXR file.

http://fnordware.blogs​pot.com …export-for-lightroom.html

It will still probably be rendered with the gamma of the output color space baked in - that is, it will not be a linear file.

To get a true linear output you can use dcraw:

dcraw [all of your other options] -4