AE Issue

There is something wrong with the WB. This is with the now default AEs each channel independently.

This is the top part of the first frame:

This is the top part of the second frame:

The second frame show the correctly exposed channels, but the first doesn't. Perhaps because there is no film in the beginning of the strip and metering is considering it also?

Or the code is just simply not AEs each channel independently for the first frame?

```
2026-08-29T13:44:21.237462Z INFO connected to scanner
2026-08-29T13:44:21.249515Z INFO load a film strip
2026-08-29T13:44:43.093026Z INFO film loaded
2026-08-29T13:44:53.295782Z INFO frame length format=F135 length=5669
2026-08-29T13:44:53.340847Z INFO measured the loaded strip frames=4 polarity=Negative pitch=5863
2026-08-29T13:44:53.344122Z INFO detected frames frames=4
2026-08-29T13:44:53.349048Z INFO wrote scan_33_thumbnail.tiff
2026-08-29T13:45:04.731218Z INFO focused at position=201
2026-08-29T13:45:46.559098Z INFO metered frame=1 exposures=Exposures({Red: 55546, Green: 45245, Blue: 38570})
2026-08-29T13:45:46.672249Z INFO 5576 x 3945 at 4000 dpi, wrote scan_33.tiff frame=1
2026-08-29T13:45:53.085822Z INFO focused at position=202
2026-08-29T13:46:32.914346Z INFO metered frame=2 exposures=Exposures({Red: 100376, Green: 195384, Blue: 223268})
2026-08-29T13:46:33.029511Z INFO 5576 x 3945 at 4000 dpi, wrote scan_34.tiff frame=2
2026-08-29T13:46:39.542035Z INFO focused at position=200
2026-08-29T13:47:19.202047Z INFO metered frame=3 exposures=Exposures({Red: 100277, Green: 194856, Blue: 222634})
2026-08-29T13:47:19.322644Z INFO 5576 x 3945 at 4000 dpi, wrote scan_35.tiff frame=3
2026-08-29T13:47:25.715751Z INFO focused at position=201
2026-08-29T13:48:05.359880Z INFO metered frame=4 exposures=Exposures({Red: 100197, Green: 195616, Blue: 223069})
2026-08-29T13:48:05.475290Z INFO 5576 x 3945 at 4000 dpi, wrote scan_36.tiff frame=4
2026-08-29T13:48:21.398772Z INFO ejected
2026-08-29T13:48:21.411162Z INFO load the next strip
stopping at the next safe point, this can take a moment
```