@@ -413,14 +413,12 @@ def _make_image(self, A, in_bbox, out_bbox, clip_bbox, magnification=1.0,
413413raise ValueError ("Invalid dimensions, got %s" % (A .shape ,))
414414
415415alpha = self .get_alpha ()
416- if alpha is None :
417- alpha = 1.0
418416
419417output = np .zeros ((out_height ,out_width ,4 ),dtype = A .dtype )
420418
421419_image .resample (
422420A ,output ,t ,_interpd_ [self .get_interpolation ()],
423- self .get_resample (),alpha ,
421+ self .get_resample (),alpha if alpha is not None else 1 ,
424422self .get_filternorm ()or 0.0 ,self .get_filterrad ()or 0.0 )
425423
426424if created_rgba_mask :
@@ -445,7 +443,7 @@ def _make_image(self, A, in_bbox, out_bbox, clip_bbox, magnification=1.0,
445443# and the pixels that Agg is telling us to ignore (relavent
446444# to non-affine transforms)
447445# Use half alpha as the threshold for pixels to mask.
448- out_mask = out_mask | (hid_output [...,3 ]< .5 )
446+ out_mask = out_mask | (hid_output [...,3 ]== 0 )
449447output = np .ma .masked_array (
450448hid_output [...,0 ],
451449out_mask )
@@ -463,9 +461,9 @@ def _make_image(self, A, in_bbox, out_bbox, clip_bbox, magnification=1.0,
463461
464462# Apply alpha *after* if the input was greyscale without a mask
465463if A .ndim == 2 or created_rgba_mask :
464+ alpha_channel = output [:, :,3 ]
466465alpha = self .get_alpha ()
467466if alpha is not None and alpha != 1.0 :
468- alpha_channel = output [:, :,3 ]
469467alpha_channel [:]= np .asarray (
470468np .asarray (alpha_channel ,np .float32 )* alpha ,
471469np .uint8 )