Convert Flashback ONE35 proprietary raw to DNG raw

00-README.md

Convert Flashback ONE35 proprietary raw to DNG raw

This script adapts the proprietary raw format used by the Flashback ONE35 camera to DNG raw.

It’s hit or miss whether apps take this properly. I’ve had the best results opening the DNGs with Affinity Photo.

The parameters of the raw also won’t be perfect because we don’t have a camera or lens profile. You also won’t see the shutter speed, aperture, etc. because the camera doesn’t seem to store this data at all.

License: Apache License, version 2.0

flashback_dng.py

#!/usr/bin/env python3
"""
pip install numpy tifffile
"""

import sys
import json
from pathlib import Path
import numpy as np
import tifffile

if len(sys.argv) != 2:
	print(f'Usage: {sys.argv[0]} file.dng', file=sys.stderr)
	print(f'Matching file.json sidecar file must exist')
	sys.exit(1)

raw_path = Path(sys.argv[1])
json_path = Path(f'{str(raw_path)}.json')
dng_path = Path(f'{str(raw_path)}.dng')

if not raw_path.exists():
	print(f'File not found: {raw_path}', file=sys.stderr)
	sys.exit(1)

if not json_path.exists():
	print(f'JSON sidecar not found: {json_path}', file=sys.stderr)
	sys.exit(1)

with open(json_path, 'r') as f:
	metadata = json.load(f)

width = metadata['width']
height = metadata['height']
gain = metadata.get('gain', 16)
exposure_lines = metadata.get('exposure_lines', 18)

print(f'Dimensions: {width}x{height}')
print(f'Gain: {gain}')
print(f'Exposure lines: {exposure_lines}')

with open(raw_path, 'rb') as f:
	raw_data = f.read()

bayer_8bit = np.frombuffer(raw_data, dtype=np.uint8) \
	.reshape((height, width))

bayer_16bit = (bayer_8bit.astype(np.uint16) << 8)

with tifffile.TiffWriter(dng_path, bigtiff=False) as tif:
	tif.write(
		bayer_16bit,
		photometric=32803,
		compression=1,
		planarconfig=1,
		bitspersample=16,
		rowsperstrip=height,
		metadata=None,
		extratags=[
			(254, 'I', 1, 0, True), # NewSubFileType

			(271, 's', 0, 'Flashback', True), # Make
			(272, 's', 0, 'ONE35', True), # Model
			(274, 'H', 1, 1, True), # Orientation

			(50706, 'B', 4, b'\x01\x04\x00\x00', True), # DNGVersion
			(50707, 'B', 4, b'\x01\x01\x00\x00', True), # DNGBackwardVersion
			(50708, 's', 0, "Flashback ONE35", True), # UniqueCameraModel
			(50709, 's', 0, "Flashback ONE35", True), # LocalizedCameraModel

			(50714, 'H', 1, 0, True), # BlackLevel
			(50717, 'H', 1, 65535, True), # WhiteLevel
			(50718, 'I', 2, [1, 1], True), # DefaultScale
			(50780, 'I', 2, [1, 1], True), # BestQualityScale

			(50721, 'i', 9, [10000, 0, 0, 0, 10000, 0, 0, 0, 10000], True), # ColorMatrix1
			(50778, 'H', 1, 21, True), # CalibrationIlluminant1

			(50829, 'I', 4, [0, 0, height, width], True), # ActiveArea

			(33421, 'H', 2, [2, 2], True), # CFARepeatPatternDim
			(33422, 'B', 4, [2, 1, 1, 0], True), # CFAPattern
			(50710, 'B', 3, [0, 1, 2], True), # CFAPlaneColor
			(50711, 'H', 1, 1, True), # CFALayout
		]
	)