I tried taking several pictures today with and without the case (Samsung Smart View) and the pictures appear to be identical so I don't think the case has any impact on the pictures other than to creat shade when taking close ups. I also couldn't replicate the blue tint but it was a dull rainy day today. The blue tint seems to be related to when it is very sunny outside and taking photos inside the car. However I have previously experienced issues when trying to take pictures of tags and labels on laptops, routers etc with no flash it sometimes **bleep** a shade over the image but with flash it's too bright and obscures the image, if you go too far away to take image with no flash it struggles to get sufficient detail to zoom in. I don't think it's an issue with the camera or phone, I think it's the software that seems to compensate with a filter in certain circumstances, which you can see when you move the phone closer and further away or different angles as you can see the filter engage and release as you move the phone, kind of like autofocus but adding a filter instead.
PS the pictures today were of shopping receipts and although we're a little yellowy white, they were acceptable