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Just installed Photoshop CS. If I open a Jpeg file and preform "Save as…" to TIFF, so that I can make my adjustments and then later convert back to JPEG. So, I click on "save as TIFF" and it tells me "A file C:\……already exists. Do you want to replace it?" I click "yes". Then when I try to reopen this file I get a warning—"Could not complete your request because an unknown or invalid JPEG marker exists." I never had this problem in Elements. I have deleted the preferences, but to no avail. Please help!
How to Master Sharpening in Photoshop
Give your photos a professional finish with sharpening in Photoshop. Learn to enhance details, create contrast, and prepare your images for print, web, and social media.