It's starting to sound like there is a bug in Lightroom - this sort of thing is getting reported too often, or so it seems to me..
It would help if you define "pixelated" - post screenshots, and maybe original file with steps to reproduce.
Sitecore is a web site? So are you resizing the images to be posted? To what size? What jpg quality/compression? How do the jpgs look on your computer before uploading? Can you post a link to the Sitecore page with your photos?
Ok, will dig out some files and upload them.
I apologise y, i meant Lightroom not Sitecore. I use to Sitecore at work so it's on my mind
By Pixelated i mean that that the image looks like i have blown it up, so it would cover a whole wall. accept i have not done anything to the image in lightroom. Just opened the image.
So by pixelated you mean the entire image is visible but at a very low resolution? This could be the camera-embedded thumbnail JPG that LR momentarily shows and may not be getting updated to the Adobe raw conversion. Perhaps the raw files are corrupted and LR cannot compute any full-resolution image from the raw data to replace the thumbnail, or perhaps the LR preview cache is corrupted and so LR cannot retrieve its previously-computed previews.
What happens if you select a group of these photos in Library and then use Library / Previews / Build 1:1 Previews (and Build Standard Previews)?
As Rob says a screenshot would be helpful in communicating what “pixelated” means, exactly, because the look of a corrupted raw file is different than the look of a reduced-size thumbnail.
What happens if you go to Develop where LR actually uses the raw data instead of looking up something in the preview cache?