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Minolta Dimage 7 .MRW File Format Discoveries v1.1
Paul K. Hansen, (pal.hans@online.no)
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v1.1 -Included information from Jake
(His notes on .mrw format can be found here: http://jb.club.tip.nl/)
-Some minor corrections on field descriptions
v1.0 -First release of the reverse engineering results
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1. Important Data for converting the images
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-Image Data Dimensions: 2568 x 1928
-Image Data Big Endian 12bit values right aligned in 16 bit words.
(12bit Value range used by camera 0000-0F7D = 0-3965)
-First Image Data Row Starts with Red Pixel. Odd rows RGRGRG.. Even Rows GBGBGB..
-Image Data offset = (4 byte Offset value at 0x04) + 0x08
-WB Bias candidate offset = (4 byte Offset value at 0x2c) + 0x3c (Two 4-byte values)
-Aternate Image data Offset calculation:
offset = File Size - (4 byte Data Size found at offset 0x23C)
= (9945728) - (9902208) = 0xAA00 (43520) for test picture PICT0003.MRW
-Alternate WB Bias Candidate offset calculation:
offset = ((0x37B3 + (4 byte Thumbnail size found at offset 0x244)) rounded to 1st higher 4 byte multiple) + 0x0C
= (0x37B3 + 0x7152 = 0xA905 rounded up to..) 0xA908 + 0x0C = 0xA914 for test picture PICT0003.MRW
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2. Minolta Dimage7 .MRW raw file HEADER Info
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2.1 First 48 bytes
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00 4D 52 4D 00 00 A9 F8 00 50 52 44 00 00 00 18
32 37 36 36 30 30 30 31 07 88 0A 08 07 88 0A 00
10 0C 52 00 00 00 00 01 00 54 54 57 00 00 A8 D8
Notable offsets:
-0x00 4 bytes 00 4D 52 4D (" MRM") Minolta MRW Magic Number
-0x04 4 bytes 00 00 A9 F8 Image Data Offset
(Add 0x08 to get the correct offset)
-0x18: 2 bytes 0788 (1928) Image Data Height
-0x20: 2 bytes 0A08 (2568) Image Data Width
-0x2c 4 bytes A8D8 Offset to Minolta proprietary block
(Add 0x30 to get the correct offset)
2.2 Tiff Tags found (Values in Hex. Other formats in paranthesis)
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-ADD 0x30 TO ALL OFFSETS REPORTED IN TIFF TAGS!!
2.2.1 TIFF Header
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Location Tag TagName
30 4D4D Tiff Big endian
32 0024 Tiff Magic Number
34 8 IFD 0 Offset
2.2.2 IFD0 (Number of entries: 9)
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Location Tag TagName Type Count Value/Offset Comments/ Value at Offset + 0x30
3A 0100 Width LONG 1 A 00 (2560) Misleading! Raw image width 2568
46 0101 Height LONG 1 7 80 (1920) Misleading! Raw image height 1928
52 0103 Compression SHORT 1 1 (Uncompressed)
5E 010E Description ASCII 8 Offset 7A DCF 1.0
6A 010F Make ASCII 12 Offset 82 Minolta Co., Ltd.
76 0110 Model ASCII 9 Offset 94 DIMAGE 7
82 0131 Software ASCII 8 Offset A4 A1v021e
8E 0132 DateTime ASCII 14 Offset B4 2001:10:25 14:14:32
9A 8769 EXIF IFD Offset LONG 1 Offset C8
2.2.3 IFD1 (EXIF IFD) (Number of entries 15)
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Location Tag TagName Type Count Value/Offset Comments/ Value at Offset + 0x30
FA 8822 Exposure Program SHORT 1 2
106 8827 ISO Speed SHORT 1 C8 (200)
112 9000 Exif Version UNDEFINED 4 30 32 31 30
11E 9003 DateTimeOriginal ASCII 14 Offset 182 2001:10:25 14:14:32
12A 9004 DateTimeDigitized ASCII 14 Offset 196 2001:10:25 14:14:32
136 9201 Shutter Speed SRATIONAL 1 Offset 1AA 00 00 00 55 00 00 00 0A (8.5) <Note 1>
142 9020 Aperture RATIONAL 1 Offset 1B2 00 00 00 32 00 00 00 0A (5.0)
14E 9204 Exposure Bias Value SRATIONAL 1 Offset 1BA FF FF FF FD 00 00 00 0A (-0.3)
15A 9205 Max Aperture RATIONAL 1 Offset 1C2 00 00 00 23 00 00 00 0A (3.5)
166 9207 Metering Mode SHORT 1 3
172 9208 Light Source SHORT 1 1
17E 9209 Flash SHORT 1 0
18A 920A Focal Length RATIONAL 1 Offset 1CA 00 00 01 5D 00 00 00 10 (3.49)
196 927C Manufacturer Notes UNDEFINED 34CA (13514) Offset 1D2
1A2 A001 ColorSpace SHORT 1 1
Note 1: The Shutter speed is denoted by APEX value. To get shutter speed,
use the following formula: Shutter Speed = 1 / (2^(Field value))
2.2.4 MLT0 (Manufacturer Notes) (Number of entries 7)
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Location Tag TagName Type Count Value/Offset Comments/ Value at Offset + 0x30
204 0000 Block Descriptor UNDEFINED 4 4D 4C 54 30 "MLT0"
210 0001 Camera Settings UNDEFINED 9C Offset 22C <See 2.2.5>
21C 0010 Autofocus Related UNDEFINED 32A8 Offset 2C8 <Note 1>
228 0020 ??? UNDEFINED 104 Offset 3570 ???
234 0040 Image Size LONG 1 00 97 18 80 (9902208) Image Data Size
240 0081 Thumbnail UNDEFINED 7152 Offset 3783 320x240 JPEG encoded Thumbnail
24C 0E00 Epson PIM info? UNDEFINED 28 Offset 3674 "PrintIM 0100"
Note 1: The first four values in the block are AF if autofocus was used, 0 if not.
This block might also have exposure metering raw data.
2.2.5 Camera Settings (0x25c-0x2f7, 156 bytes)
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-This block doesn't follow the TIFF Tag format.
-Some offsets/values have been discovered, thanks to Jack for this!
-The contrast/wb/saturation values here stays constant when the value is changed in DIVU
Location Length Description Values
28B 1 byte Macro Mode Value is 1 if Macro mode was used, 0 else.
2AF 1 byte Flash Value is 1 if flash was used, 0 else.
2CA 2 bytes Picture Number First picture value 0, incrementing per picture. (Per seesion?)
2D6 2 bytes White Balance 01F1 = AWB, 0164 = Daylight, 028F = Tungsten,
0216 = Fluorescent, 0151 = Cloudy 0164 = Custom Calibration. <Note 1>
2DB 1 byte Saturation Subtract 3 from value to get saturation adjustment setting.
2DF 1 byte Contrast Subtract 3 from value to get contrast adjustment setting.
Note 1: These values are reported by Jack. I have seen other values here as well, such as 015C.
2.3 Minolta Proprietary block (0xA908)
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Offset to this block is found at location 0x2c. Add 0x30 to the 4 byte value here to get the offset.
A909 00 57 42 57 (" WBG") Length: 00 00 00 0c (12) Contents: 02 02 02 02 01 c3 01 00 01 00 01 5c (WB Bias?)
A91C 00 52 49 46 (" RIF") Length: 00 00 00 38 (56)
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A924 ??? Value: 00
A925 Saturation Setting Legal Values: FD=-3 FE=-2 FF=-1 00=0 01=+1 02=+2 (Changes when saved in DIVU with new settings)
A926 Contrast Setting Legal Values: FD=-3 FE=-2 FF=-1 00=0 01=+1 02=+2 03=+3 (--"--)
A927 Sharpness Setting Legal Values: FF=Soft 00=Normal 01=Hard (--"--)
A928 WB Setting Legal Values: 0=As set on camera, 1=Daylight, 2=Cloudy, 3=Tungsten, 4=Fluorescent (--"--)
A929-A92B ??? Values: 00 38 00
A92C-A94B ??? Values: 00 f0 02 84 01 c3 01 5c 01 c9 01 49 01 ca 02 0a
01 e5 01 31 02 0f 01 44 00 4c 00 4b 00 1e 00 4b
A94C-A95B White Balance? Values: ff db ff c6 00 99 ff c6 00 9a ff b6
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A95C 00 50 41 44 (" PAD") Length: Variable Variable number of null bytes. Padding for alignment of image data
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