Digital nature denotes that digital data can be changed, manipulated, and even ownership right of such data can be misused. The watermarking schemes have been introduced to prevent unauthorized users from abusing digital information, and to uphold ownership rights of digital contents which have usage in all three forms of media. This study aims to test blind linear correlation technique for image watermarking by Stirmark benchmark version four which includes sixteen diverse tests, such as distortions, and attacks that are well-known for image processing. Those tests are applied on the image sets which are watermarked by blind linear correlation technique and the outcome and result of this experiment are discussed in this article. 1.