Cell aspect calibration (ct160)
Each block is the SAME image: a white circle inscribed in a green square, with a red crosshair. Only the --cell-aspect differs.
Find the one where the CIRCLE TOUCHES ALL FOUR SIDES of the green square and looks round.
too WIDE -> circle overflows top and bottom -> pick a HIGHER value too TALL -> circle pulls away from left and right -> pick a LOWER one
Then convert future images with that value:
img2mu.py pic.png --width 60 --cell-aspect <value>
--cell-aspect 0.45 (36 x 16 chars)
--cell-aspect 0.50 (36 x 18 chars)
--cell-aspect 0.55 (36 x 20 chars)
--cell-aspect 0.60 (36 x 22 chars)
--cell-aspect 0.65 (36 x 24 chars)
--cell-aspect 0.70 (36 x 25 chars)
The value is a property of the VIEWER, not the image. A block that looks right here may look stretched in a different client.