todd_shaner_6660895's profile
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Mon, Jun 17, 2019 9:25 PM

Lightroom/Camera Raw: Auto Tone Applied Incorrectly to Cropped Images

Prior to Lightroom 7.1 cropped image Auto Tone settings were calculated the same as uncropped images using the full image data. Lightroom 7.1 introduced Adobe Sensei technology and calculation of Auto Settings using only the crop image data. By excluding the area outside of the crop it should improve the image rendering since it uses ONLY the target image data inside the crop for calculating and applying the Auto settings.

A number of people are still complaining that the new and improved Auto Settings is not working well with certain image types. The most common complaint is that it still under or overexposes the image. While working on another similar problem I discovered an issue with the way Auto settings are calculated and applied to cropped image files. It appears the Auto Settings values are being calculated properly using only the crop area image data, but then applied "adaptively" using the entire uncropped image data as the basis for applying the new image data values.

This causes cropped images with much darker or lighter image content outside the crop area to render darker and lighter respectively. Obviously, this makes the Auto Settings function less accurate than it could be using only the crop area image data for all Auto Tone processing steps.Below is a controlled test I ran to confirm this behavior. I used a large piece of poster board with gray on one side and white on the other to simulate lighter and darker subjects outside the crop area. Manual exposure was used to insure the two image files (gray board and white board) have identical camera exposure values (shutter speed and aperture). What I noticed is that underexposed image file pairs exhibit larger differences. The controlled test files used here are ~1.75 EV underexposed, but the normal exposure file pairs shot at the same time also exhibit the issue. You can download the two CR2 files used in the below screenshots here.

https://www.dropbox.com/sh/44gpzg9skb1g7lt/AAC-5i5UBSQUrlfhXsXDvwJVa?dl=0

Responses

990 Messages

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14.9K Points

2 y ago

Same for me under macOS,
Je viens de faire les essais sur 2 copies virtuelles du nême RAW original, mais une des copie est recadrée sur le sujet principal.
Les valeurs définies par la fonction Auto sont différentes pour les deux copies virtuelles. Mais est-ce gênant ? Je n'en suis pas certain, peut-être faut-il développer différemment si recadrage ?

I have just done the tests on 2 virtual copies of the original RAW, but one copy is cropped on the main subject.
The values ​​defined by the Auto function are different for the two virtual copies . But is it annoying? I'm not sure, maybe it should develop differently if cropping?


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2 y ago

@Todd, does Adobe Camera Raw exhibit the same behavior? Trying to figure out which team gets this...

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2 y ago

Rikk, I see the exact same behavior and readings using Camera Raw 11.3 with the two files posted to Dropbox.

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2 y ago

Good work Todd!