First of all, thank you, it’s working nicely now.
open the captured tga with photoshop, notice it’s 726X434 pixels,
is there a way to control it? for example, 1280X960?
it is the size of the blender window (not the window in which blender runs, the 3d window, not counting the header) in which the screenshot was taken
you may be able to get what you want by running
blenderpublisher -w -p 0 0 1280 960
but you will have to add the window borders, and in windows the window size cannot be larger than your resolution
if that is your fullscreen resolution run blender fullscreened with a blender screen that only has the 3d window and no header. (you can switch between screens with control + left and control+right)