how do you know when a movie has been remastered for the Blu ray release

[1924]

or it is using an old master?

[sonyfanboy]

Originally Posted by 1924

or it is using an old master?

I can just tell if the film was re-scanned during the Blu-ray era. The grain is finer, better detail, accurate colors. Older scans look washed out or sometimes over saturated, have muddy textures, have dirt and film defects here and there.