water mark so strong

[sghong]

Is there way to a little of blur alike adobe reader as below ?

this is sumatrapdf.

[GitHubRulesOK]

Hard to be sure from an image however, since the watermark is seemingly showing in foreground compared to Acrobat appears to be background? There is possibly an error in how the object is read or defined. A sample file would need to be provided for analysis.

[kjk]

It looks like a bug. Try with latest pre-release.

If it still happens, you can open an issue. Must include a sample document.