The same colour negative on the same OpticFilm 8200i, scanned once with our
plustek8200i backend and once with upstream SANE's
genesys GL128. Both are shown through the identical negative-conversion pipeline, so what you see differs only because the scanners' raw data differs.
Speed (full frame)
600 dpi16.7 s / 16.4 s
3600 dpi34.6 s / 54.4 s
ours / genesys
Output size at 3600 dpi
ours5184 × 3877
genesys5184 × 3519
Features
Infrared channelours ✓ genesys ✗
8-bit outputours ✓ genesys ✗
Resolutions6 / 11
1 · Whole frame, 600 dpi
Both scans are drawn on one shared film coordinate system, so the same piece of film lies in the same place in every view. Dark areas are where a backend's scan window did not reach. White areas are inside a window but beyond the film (unexposed film inverts to white).
oursgenesys
Drag anywhere on the picture, or focus the handle and use the arrow keys.
ours
genesys
Zoom with the buttons above, then scroll: both panels move together.
ours
Click the picture or press Space to flip between the two. Whatever moves is a difference.
2 · Scan area
Distance in millimetres between the film's edge and the edge of each backend's scan window. A negative number means film was cut off.
600 dpi
left
right
top
bottom
ours
+0.13
+0.80
+1.65
+1.44
genesys
+1.19
−0.25
+0.25
+0.38
3600 dpi
ours
+0.17
+0.85
+1.64
+1.56
genesys
+1.19
+0.06
+0.45
+0.22
What this means. Genesys's window sits 1.06 mm to the left of ours, a constant at both resolutions. It leaves a 1.2 mm dark strip on the left and runs up against the film's right edge. Its top and bottom margins are only 0.2–0.45 mm and drift with resolution (ours stay at ~1.6 mm), so a small positioning error would clip the picture. Copying genesys's horizontal offset would move our window toward clipping; ours is the safer set of values.
3 · Detail at 3600 dpi
The same physical area cut from each 3600 dpi scan (1000×750 pixels, shown at the full width of the box), lined up to within a few pixels. Drag to wipe between them.
oursgenesys
The girl's face and a tulip
oursgenesys
The large, soft-focus tulip on the right
oursgenesys
Flowers and soil at the bottom
Sharpness is a wash; colour is not. At full resolution both backends resolve the same detail, and even the dust specks line up. The visible difference is colour balance: genesys's raw data renders greener and brighter. That comes from each backend's calibration (white balance and exposure of the raw data), not from lost detail, and it is a matter of per-channel gain that can be balanced in software. Our infrared channel, which can remove those dust specks, is not available through genesys at all.