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You are here: Home / The Last Word / Lightroom and Photoshop Exposure controls, part 3

Lightroom and Photoshop Exposure controls, part 3

April 16, 2013 JimK Leave a Comment

[Added after the original post. Eric Chan has informed me that there are two image-processing pipelines in Lightroom: output-referred, and scene-referred. Raw files get the scene-referred pipeline. Integer TIFFs get the output-referred pipeline. Therefore, the TIFF test images are getting a different set of processing than LR applies to raw files.]

Now for a three-dimensional look at the results from the previous post. First, the Lightroom images. The a* axis is on the right, and the b* on the left.

The baseline exposure:

Basically, there’s just a little bit of noise. All the values are between L* = 48.85 and a hair over 48.95.

One stop underexposed:

Two stops underexposed:

Three stops underexposed:

Four stops underexposed:

Pretty much the same story in all of the underexposures; the blue/cyans and magentas are darker than they should be.

I’ll spare you looking at all the Photoshop images. Here’s the worst, the four-stop-under one:

Just noise on the L* axis, and not much of that. A really fine performance.

The Last Word

← Lightroom and Photoshop Exposure controls, part 2 Lightroom and Photoshop Exposure controls, part 4 →

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