Both Canon T6i and Canon 77D have APS-C sized 24.0 MP resolution sensors so sensor size and resolution is not a differentiator between these two cameras.
Below you can see the T6i and 77D sensor size comparison.
Canon T6i and Canon 77D 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
DxOMark is a benchmark that scientifically assesses image quality of camera sensors. It 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. Canon T6i and Canon 77D sensors have been tested by DxO and the results show that 77D has a better overall score of 78, 7 points higher compared to T6i's score of 71.
Model |
Overall |
Color Depth |
Dynamic Range |
Low-light ISO |
Canon T6i |
71 |
22.7 bits |
12.0 Evs |
919 ISO |
Canon 77D |
78 |
23.6 bits |
13.3 Evs |
971 ISO |