Use same factor for all images (#82)

scripts/process_dm.py

@@ -122,13 +122,16 @@ def extract_image_number(s):
  j = extract_image_number(fn)
  img = np.array(Image.open(fn))
 
- if img.dtype != np.uint16:
- # cast to 16 bit uint16
- img = rescale_intensity(img, out_range='uint16')
-
  h = {'ImageGetTime': timestamp, 'ImageExposureTime': exposure_time}
  buffer.append((j, img, h))
 
+ if img.dtype != np.uint16:
+ max_val = max(img.max() for _, img, _ in buffer)
+ min_val = min(img.min() for _, img, _ in buffer)
+ for item in buffer:
+ # cast to 16 bit uint16
+ item[1] = rescale_intensity(item[1], out_range='uint16', in_range=(min_val, max_val))
+
  img_conv = ImgConversion(buffer=buffer,
  osc_angle=osc_angle,
  start_angle=start_angle,