Tarnished is -2.0 to -3.0 / month. Slightly Tarnished is -1.0 to -2.0 / month (with roundoff you'll see -1.0 displayed for both Respectable and Slightly Tarnished, and -2.0 displayed for both Slightly Tarnished and Tarnished).Lord Costabella said:after the war, and some muslim fighting, my reputation was at Tarnished. I granted a county to a duke of mine, created an archbisophric (with two counties given to a newly created bishop), and elevated a count to duke status (no count title given). Yet after this, my reputation hadn't even increased to slightly tarnished. It was still tarnished.
The general rule is that each title is a 0.2 boost to reputation, although dukes may be more (There is a bonus depending on how many vassals the duke gets given to him).
So you granted 1 county to your duke: +0.2
Created a bishop: +0.0 (bishops only give piety when created)
Gave that bishop a second county: +0.2
Elevated a count: +0.2
For a total bonus of +0.6
If you were at -2.6 to -3.0 per month before you did that, you'll still be Tarnished after.
To get more information, hover over a vassal's loyalty display and notice what his modifier from your reputation is.
-Richard Campbell.