Exposure slider not entirely linear ?

Ive recently captured an image with a bright, red to orange sky in the background due to sunset conditions. With a linear preset in ACR (all tonal controls zero, parametric and point curve linear) theres no clipping indicated.
Actually the Exposure slider has to be raised to +0.70 in order to drive relevant parts of the sky into clipping. But, the Exposure slider has to be set down to -0.70 in order to detach the histogram from the right end of scale.
In between, its obvious that the histogram does not react linearly to the Exposure slider. Increasing it from 0.70 to +0.70 accumulates and compresses more and more data in the right corner of the histogram (up to RGB 254) without making the final step to clipping.
Output space is set to ProPhoto RGB, Noise reduction and Sharpening are off, the Recovery slider for sure is at zero. Its CS4 + ACR 5.2.
Any thoughts or explanations?
Thanks!
Peter

> You can effectively get linear output from Camera Raw (with the exception of gamma encoding) by creating a custom color profile with the DNG Profile Editor with its Base Tone Curve set to Linear, then use the Camera Raw Defaults when processing your image and select that custom color profile.
Eric, - Many thanks for joining discussion. So what would be the difference between a.) using such linearized custom profile created the way you describe with the DNG profile editor, and b.) employing a linear preset in ACR, means to set all tonal controls to zero, parametric/point curve linear while using the baseline matrix profile ?
Or, let me ask straightforward: could there possibly be something behind my question, or am I barking up the wrong tree ?
> The conversion of the demosaiced raw data from the camera's color space in sRGB, aRGB or ProPhoto RGB includes the non-linear transformation as well. This can not be avoided in ACR to my knowledge
Again my understanding was that matrix-to-matrix conversion is essentially a linear transform (if this is the right term). Means that linear scaling and matrix-to-matrix conversion are essentially commutative, the sequence can be exchanged and the results will be the same (provided that the absolute value of the scaling factor is adjusted) and despite different matrix primaries and different gamma. However, I agree that there are a couple of constraints such as:
/> out of gamut colors
/> fancy 'gamma' e.g. with the sRGB TRC
/> AbsCol conversion between different white points which can introduce additional clipping
/> RelCol conversion between different white points (not sure about this one)
So in order to check my approach of testing, I did some ColorChecker exercises. Processed it through ACR (linear preset) with different Exposure settings. Converted to 'linear gamma' ProPhoto RGB in Photoshop. Finally, all derived ratios R2:R1, G2:G1 and B2:B1 were approx the same, whether this is a color or gray patch which I think confirms linearity.
Seems I still have to find out whats so special with my sunset sky. Or, the hue preserving feature comes in mind which was reported to cover ACRs tone curve(s). Could it be that it acts 'on' the Exposure slider as well, once a single channel is driven into clipping, thus, preventing this. Just a thought.
Many thanks for your comments.
Peter

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