ponjon, don't want to rain on the parade but doesn't look like you have room for R19 either. Check rafter depth - look like 2x6's, which would be around 5 1/2" at best. R19 is 6 1/2" so you're either gonna crush the rafter vent (no air flow) or the insulation (loss of R value). If they are 2x6's you might want to go with R13 or R15 (both 3 1/2") and then nail 1" or even 2" foam boards underneath. This will give you a tighter job and brighten up the ceiling if you use foil or white faced foam. Keep in mind code calls for foam or paper faced insulation to be covered with a fire barrier like drywall or thermoply but this shouldn't matter unless you plan to sell in the near future.
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