Both Canon T6 and Canon 100D have APS-C sized 18.0 MP resolution sensors so sensor size and resolution is not a differentiator between these two cameras.
Below you can see the T6 and 100D sensor size comparison.
Sensor Size and Resolution Comparison image of Canon T6 and Canon 100D Cameras
Canon T6 and Canon 100D have the same sensor sizes so they will provide same level of control over the depth of field when used with same focal length and aperture.
DxOMark Sensor Scores
Both Canon T6 and Canon 100D sensors have been tested by DxoMark. DxoMark scores camera sensors for color depth (DXO Portrait), dynamic range (DXO Landscape) and low-light sensitivity (DXO Sports), and also gives them an overall score. Of the two cameras that we are comparing, T6 has scored 66, 3 points higher than 100D.
Model
Overall
Color Depth
Dynamic Range
Low-light ISO
Canon T6
66
22.0 bits
11.7 Evs
781 ISO
Canon 100D
63
21.8 bits
11.3 Evs
843 ISO
Sensor size sets the circle of confusion, so it drives how much depth of field each
of these bodies gives you at a given aperture. You can calculate it exactly for the
Canon T6
or the
Canon 100D ,
including hyperfocal distance.