Watermark-free images refer to images without copyright or special markings added in the image, watermarked images are images with various means of copyright or special markings added in the image to achieve document authenticity identification, copyright protection and other functions. The difference between a watermarked image and a non-watermarked image is as follows:

1. Imperceptibility

There is a very huge difference in the degree of visibility of different watermarks. Some watermarks require some understanding to make them visible, while others are easily observable. Various simple methods of creating watermarks have been developed, such as watermarking liquids that can even be used to create a watermark without damaging the paper.

Watermark-free images are not added to the mark and external text cover, the visual effect than better.

2. Proof

Watermarked pictures are mostly printed with their own unique mark, add some digital information to achieve the authenticity of the document to identify, watermarks should be able to be protected by copyright information products reliable evidence. Watermarks can be used to determine whether the object is protected, and can monitor the dissemination of protected data, authenticity identification and illegal copy control and other copyright protection functions. Watermarks often serve to verify the authenticity of currency, passports, stamps, government documents, or other paper documents.

Images without watermarks are easily stolen and can be used, modified, and distributed.

3. Different purposes

Pictures with watermarks are generally advertising and commercial in nature, and a few are intellectual property-based. Pictures without watermarks are rarely used for commercial purposes and can be widely disseminated and used.

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