diff options
| -rw-r--r-- | utils/raspberrypi/ctt/ctt_image_load.py | 32 |
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] |