I have a few photos where in the develop module they look extremely low quality. I typically import with 1:1 previews enabled. I've tried deleting the preview to no avail. I still have the photos on my SD card so I may try to reimport.
I reimported the photos to the same effect, the preview looks bad with zero edits applied. Older photos on my catalogs still look 100% correct and fine. Right click > edit in Photoshop the photo looks fine.
Not sure what to make of it or what else I can try. This is using a raw photo from my sony a6600.
First, the preview architecture in Develop is unique to all other modules and the most accurate preview of the data. You should always view previews there and elsewhere at 1:1 or greater and when comparing, use the same zoom for each.
It is normal to see slight differences at 1:1 but if really excessive, the first thing to try is to disable GPU in preferences; better? If not, you might have a corrupted display profile. Recalibrate the display or whatever you usually do to create a display profile. When given the option to build this profile, pick Version 2 (not V4) and Matrix not LUT.
Author “Color Management for Photographers" & "Photoshop CC Color Management/pluralsight"