Apple OneScanner (1991)
A 1991 Macintosh flatbed scanner with SCSI, 8 bits and 256 grey levels. Apple documentation distinguishes OneScanner from the earlier 4-bit Scanner and later Color OneScanner models.

© All About Apple museum / www.allaboutapple.com, as credited by Commons; individual photographer not named · CC BY-SA 2.5 Italy ↗
Specs
| Ports | SCSI · no ADB |
| Extras | 8-bit · 256 grays · 72-300 dpi |
1991 documentation
Two Apple Tech Info Library articles created on 1 October 1991 describe OneScanner and its differences from Apple Scanner. They document the product in 1991, not an exact first-sale day.
The description introduces Light Source's Ofoto for automatic scanning or manual control. HyperScan 2.0 placed images in HyperCard 2.0 stacks.
Eight bits and connection
Apple specified 8 bits, equivalent to 256 grey levels, and variable resolution from 72 to 300 dpi in single-dpi steps. It stated there was no ADB port and finer brightness and contrast control. SCSI is documented in the family's technical manual.
A software upgrade brought new features to the earlier Scanner, but did not turn its 4 bits into 8. A software change is not a sensor transformation.
Formats and photograph
Apple's article lists PICT, TIFF, EPS and MacPaint compatibility. Photographic-quality promises belong to the manufacturer's description, not an independent test of this unit.
The All About Apple photo shows OneScanner on the front. CC BY-SA 2.5 Italy, file without new changes. Not a Color OneScanner, not a launch photo and no proof of working condition.