Ubuntu 18.04.2
Canon Pixma TS6220 
These issues are similar to an earlier bug (#1818186) that I reported regarding 
the operation of Xsane.

1) The output always contains the images of what ever is on the platen on a 
"full size" white background; i.e., unlike scangearmp2, if there is a 4” x 6” 
photo on the platen, the output is a letter size white background with the 4” x 
6” image scaled down.
2) Only images at resolutions of 75 ppi are acceptable.  When cropped in Gimp, 
and size adjusted to 4” x 6”, this works out to 300 ppi.  The scanned image of 
photos at all resolutions greater than 75 ppi are very dark/saturated – beyond 
my ability to correct.
3) The adjustments for Brightness and Contrast have little, if any, affect on 
the output for scans at resolutions 
> 75 ppi.

If I can be of any assistance in “testing”, please let me know.
Kind regards,
Bill

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https://bugs.launchpad.net/bugs/1818371

Title:
  Simple Scan images are too dark at resolutions > 75ppi.

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