ATJ wrote:gstark wrote:Part of the key here lies in the resolution of what you're posting. Reduce the resolution - significantly - but keep the same image size. As well as a discreet watermark, place something in the EXIF as well.
Do you really mean "resolution" here? The resolution (dots per inch) is completely meaning less for displaying images and essentially meaningless under other conditions. It is merely a guide for some (dumb) software to determine how to print.
Yes, exactly.
By lowering the resolution, you achieve a number of goals. It reduces the filesize of the image file, something which, for web display purposes, is good. For web display, 72 dpi is just fine.
And as you correctly point out, it affects the manner by which printing of the image is performed. To the point that it's very difficult - almost impossible - to pull a high quality image as a print from an image that's been displayed in low resolution. Basically, reduce the resolution of the image, and the best you can print is the equivalent of a 35mm contact print. That seems, to me, to be a fairly effective way to protect your IP in the image, without resorting to obliterating the image with watermarks.
If you want to go the watermark route, perhaps one in each of the corners will work. That should be enough to provide protection.
And if you see your image posted elsewhere, then a polite email to the owner of the site pointing out the situation, and asking for the situation to be corrected, should be sufficient to fix the problem.
Increasing the compression also helps; both measures should be taken, IMHO.