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Digimarc, a technology that can be integrated as a Photoshop plug-in, can also produce a digital watermark through the use of digital noise that is read by software.
Despite the presence of a watermark however, its survival through image manipulations is not definite, and the lack of a visual symbol may not prevent image theft - only act as proof of copyright owner in case of theft.
Uploading images without a color profile will not protect an image from being downloaded, but could potentially prevent it from being used: those wishing to use the image in a color managed, internet independent application may be at a loss if they see a drastic shift in colors and contrast and do not know how (or care to) to rectify it.
Protecting Images - Put plain and simple: the only way to protect your images from being downloaded or stolen off a web page is to not put them online in the first place.
While I put this fact out there as blunt as possible, there are several techniques we can use to make website downloads and image theft much harder.
*6) Hiding Images: It is possible to look for an image by scouring the source code of a webpage in search of a link to the image.
The code is fairly simple in CSS, using the "background-image:url" style: ) cell itself - the result being right click downloads are still functional but the downloaded, copied, or viewed file is a transparent
Although time consuming, another method to protect images using tables is to section them, creating multiple images pasted together using an html table.
Image watermarks come in a range of styles: from a full copyright symbol across the image to simply small text in the corner of an image containing the copyright symbol, date, and name of the copyright holder.
There is a trade off with watermark size: the larger the watermark the less likely one is to download or steal the image, but the larger the watermark the more of a visual distraction it becomes.
The result is a seamless image which takes a good deal of effort to re-assemble.