pdf – Does redacting photos in Preview utilizing opaque shapes take away the unique information from the ensuing picture file?

The Preview software has a Markup toolbar, which permits drawing excessive of a picture. I used to be occupied with the potential of utilizing this characteristic to attract opaque shapes to redact delicate parts of a picture. My particular case is hiding names from a PNG screenshot.

That is on a model of macOS previous to Massive Sur, so the “Redact Choice” choice shouldn’t be out there within the app.

My instinct is that, as a raster-graphics picture format, the ensuing PNG would not include the redacted textual content whilst non-visible picture information. This differs from one thing like a PDF, the place the info remains to be current in a layer behind the redaction, and due to this fact recoverable by analyzing the file information.

Can Preview be used on this method to irrevocably take away delicate data from a PNG picture?