JPG Histogram Significantly different after RAW export (Both color spaces PrpPhoto RGB)

[joshua]

Lightroom Version Number

20.04

Operating System

1. macOS 10.14 Mojave

I've just processed a wedding and exported my DNG files to RGB. All the histograms are somewhat different (DNG to JPGS) but some underexposed image are exporting and looking terrible. Below are 2 histograms of the same image exported (DNG and the other JPG). Why are these histograms so different? Both are screen captures in the develop module with 100% previews.

 

[Johan Elzenga]

If I understand you correctly, you exported as ProPhotoRGB jpeg? That is not a good idea, because ProPhotoRGB is far too large for 8 bits. And it’s pretty pointless, because these are black & white images...

 

[joshua]

I also exported as sRGB. Same results. The JPG histogram is way off from DNG and image looks very bad. This image was adjusted +1.5 exposure but DNG looks fine just the exported JPG is bad.

 

[Johan Elzenga]

Is it possible that the JPEG gets automatically adjusted again after import? How does the jpeg look in Preview?

 

[Paul_DS256]

Why are the adjustments different between the two images?

 

[Johan Elzenga]

Why are the adjustments different between the two images?

Because one is the adjusted original DNG, and the other one is the JPEG that was exported from it and then imported again. That makes sense.

The question is however if there are perhaps adjustments on the JPEG as well, that you do not see in the screenshot.