Could you test if this bug with color scan in Photo mode isn't fixed in simple-scan 3.36.4 or newer - I've found this in NEWS file:
Overview of changes in simple-scan 3.36.4
* Fix color scanning for Brother ADS 2200 and 2700 sane backend.
* Updated translations.
Overview of changes in simple-scan 3.37.3
* Improve compression scale which appear during file saving, to be more
intuitive.
* Fix color scanning for Brother ADS 2200 and 2700 sane backend.
Could you test if this bug with color scan in Photo mode isn't fixed in simple-scan 3.36.4 or newer - I've found this in NEWS file:
Overview of changes in simple-scan 3.36.4
* Fix color scanning for Brother ADS 2200 and 2700 sane backend.
* Updated translations.
Overview of changes in simple-scan 3.37.3
* Improve compression scale which appear during file saving, to be more
intuitive.
* Fix color scanning for Brother ADS 2200 and 2700 sane backend.