Hello! I am new to the site, so bear with me if this thread exists elsewhere. I need your help! I shot a sports portrait the other day with a pure white background, lit with three lights. It turned out great. However, I was working with an awkward piece of thick, white vinyl as the background that had significant creases in it. When I looked at the histogram on the back of my DSLR, I saw no issues. When I opened it in Photoshop at home, I had no issues. I emailed one of the images to someone and later pulled up the email on my smart phone to show a friend. This was the only time I saw the problem; there was a large, blue crease mark on the top of the photo! I saw no blemishes in the white on my laptop when I opened the image to edit it, so this was really shocking since I had already completed the assignment! My best guess is either I should have lit the white stronger OR alternatively, there is a laptop (perhaps calibration) issue that would account for why my laptop did not show me these blemishes. My question is this: Why when I pulled the image up on my smart phone blemishes in the white were very clear but NOT when I opened the JPEGs (I work for a company that does not allow us to shoot in RAW...) in Photoshop?? I could really use feedback, because I don't know how to troubleshoot this short of, I don't know, emailing my phone all my images first? That seems crazy... Thank you, everyone! PS...I can't upload the image as it is of a minor and I do not have permission, and the company I work for owns the image anyhow. FYI.