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-rw-r--r--utils/raspberrypi/ctt/ctt_image_load.py32
1 files changed, 25 insertions, 7 deletions
diff --git a/utils/raspberrypi/ctt/ctt_image_load.py b/utils/raspberrypi/ctt/ctt_image_load.py
index c3d444cd..310c5e88 100644
--- a/utils/raspberrypi/ctt/ctt_image_load.py
+++ b/utils/raspberrypi/ctt/ctt_image_load.py
@@ -301,17 +301,35 @@ def dng_load_image(Cam, im_str):
metadata.read()
Img.ver = 100 # random value
- Img.w = metadata['Exif.SubImage1.ImageWidth'].value
+ """
+ The DNG and TIFF/EP specifications use different IFDs to store the raw
+ image data and the Exif tags. DNG stores them in a SubIFD and in an Exif
+ IFD respectively (named "SubImage1" and "Photo" by pyexiv2), while
+ TIFF/EP stores them both in IFD0 (name "Image"). Both are used in "DNG"
+ files, with libcamera-apps following the DNG recommendation and
+ applications based on picamera2 following TIFF/EP.
+
+ This code detects which tags are being used, and therefore extracts the
+ correct values.
+ """
+ try:
+ Img.w = metadata['Exif.SubImage1.ImageWidth'].value
+ subimage = "SubImage1"
+ photo = "Photo"
+ except KeyError:
+ Img.w = metadata['Exif.Image.ImageWidth'].value
+ subimage = "Image"
+ photo = "Image"
Img.pad = 0
- Img.h = metadata['Exif.SubImage1.ImageLength'].value
- white = metadata['Exif.SubImage1.WhiteLevel'].value
+ Img.h = metadata[f'Exif.{subimage}.ImageLength'].value
+ white = metadata[f'Exif.{subimage}.WhiteLevel'].value
Img.sigbits = int(white).bit_length()
Img.fmt = (Img.sigbits - 4) // 2
- Img.exposure = int(metadata['Exif.Photo.ExposureTime'].value*1000000)
- Img.againQ8 = metadata['Exif.Photo.ISOSpeedRatings'].value*256/100
+ Img.exposure = int(metadata[f'Exif.{photo}.ExposureTime'].value * 1000000)
+ Img.againQ8 = metadata[f'Exif.{photo}.ISOSpeedRatings'].value * 256 / 100
Img.againQ8_norm = Img.againQ8 / 256
Img.camName = metadata['Exif.Image.Model'].value
- Img.blacklevel = int(metadata['Exif.SubImage1.BlackLevel'].value[0])
+ Img.blacklevel = int(metadata[f'Exif.{subimage}.BlackLevel'].value[0])
Img.blacklevel_16 = Img.blacklevel << (16 - Img.sigbits)
bayer_case = {
'0 1 1 2': (0, (0, 1, 2, 3)),
@@ -319,7 +337,7 @@ def dng_load_image(Cam, im_str):
'2 1 1 0': (2, (3, 2, 1, 0)),
'1 0 2 1': (3, (1, 0, 3, 2))
}
- cfa_pattern = metadata['Exif.SubImage1.CFAPattern'].value
+ cfa_pattern = metadata[f'Exif.{subimage}.CFAPattern'].value
Img.pattern = bayer_case[cfa_pattern][0]
Img.order = bayer_case[cfa_pattern][1]