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That's weird, I used a site called snaggy to save my screenshots. I'll save and upload them directly. 

Thanks for your reply. 

I did read about the operating system difference in another thread but I'm not convinced its that. 

Reason being, I created versions of the same image saved at jpeg quality 100, 90, 80, and 70

On my computer they varied in size with the largest being over 391kb, the smallest 131kb

I then uploaded them with the quality setting in the SP config at 80, then at 100. 

In every case, no matter what image I uploaded or setting was configured, the file size was reduced to between 110kb and 120kb

It's the file size reduction I'm querying. It suggests that the file is being processed somehow during upload, rather than just being uploaded. 

I can't see the JPEG quality info in the exif data so I'm not sure if that's what's being changed specifically.

But in checking the EXIF of the uploaded versions of my images I can see that the upload process is also stripping out colour space information and the embedded colour profile. 

Is there any way to turn of any/all processing during upload, so it just uploads the file exactly as-is?

Thanks again

The image(s) are within the limits set in the File Uploader settings.

The screenshots attached are from the File Uploader settings page, and from "Jeffreys Exif Viewer" website which I used to analyse the original image and the version I uploaded to my forum then downloaded again.

You'll see how the file size in this example has been reduced and the colour space information has been stripped.

When it comes to comparing the actual image quality, it's hard to tell. I can do some further testing but I'm certain that for whatever reason the file is being processed somewhere along the line. 

Cheers

Steve