Here is some debug output when a scan is initiated.
The brightness and contrast values do seem to apply from the front-end:
[+16.68s] DEBUG: scanner.vala:1674: Scanner.scan
("genesys:libusb:001:010", dpi=600, scan_mode=ScanMode.GRAY, depth=2,
type=single, paper_width=2159, paper_height=2794, brightness=-100,
contrast=100, delay=3000ms)
(I did set -100 and 100 respectively for this test).
** Attachment added: "ss-canonlide35.txt"
https://bugs.launchpad.net/ubuntu/+source/simple-scan/+bug/1327801/+attachment/5464149/+files/ss-canonlide35.txt
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Title:
Bightness and contrast settings have no effect
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