So you use the camera module i posted?
unfortunately i don’t use this module, so i am maybe the wrong person to ask…
But i took a look at the webcam.js of the module and in line 46/47 the width and hight is defined.
Maybe u should play around with that…
also check the camera.js at line 62/63…
I don’t know if it would be necessary to set the resolution of the cam within raspbian… ?
To start the cam with a button u can even use the MMM-Buttons module. This should work, if i understand the camera-module correct ^^