So, if I have something like this, where would the png files be saved? Or how could you specify?

import gl
gl.resetdefaults()
ktime= 50
ksteps= 360
gl.resetdefaults()
gl.loadimage('mni152.nii.gz')
for x in range(1, ksteps):
  gl.azimuthelevation(160+(x*5),30)
  gl.wait(ktime)
  gl.savebmp(str(x)+'mni152.png')