This is a bug report for scanning color documents into Affinity Photo on Mac. Moderator: I was registered on the legacy Serif forums, which did not automatically transfer to Affinity forums.
I can reproduce when attempting color scans. (Note: Black & White, aka, gray-scale scans, however, import correctly.)
Yes, this happens with a new document.
Environment...
OS & Version: Mac OS X Catalina (10.15.2)
Expectation: Color scan will import / acquire from flatbed scanner correctly in Affinity Photo (attached: see color preview in 'Acquire Image' dialog)
Actual Problem: Color scan is rendered in 'color bars' [sic] (attached: notice that the acquired Affinity Photo document renders in color bars)
To Reproduce: Launch Affinity Photo on Mac, and access "Acquire Image..." from the "File" menu with a color sample loaded into the flatbed scanner; click the 'Scan' button (attached: screen capture with "Acquire Image" dialog showing the sample
Screenshot attached. The scanner is Xerox WorkCentre 6515 with Mac OS drivers installed.
Thank you,
Ross B.
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Serif user since PagePlus X4 (in 2009), Ten Year Serif Anniversary Desktop Publisher since Mac OS 7.5.1 (1995)