The EXIF-JPEG metadata structure is similar to JPEG one. But EXIF-JPEG sends the Exif APP1 marker segment data in parsed form and Jfif APP0 marker segment data is not parsed and sent as raw data.
All items between items with Name "EXIF" and Id IG_FORMAT_EXIF_JPEG (Type LEVEL_START and LEVEL_END) are interpreted as EXIF data. If during sending data from application level to filter level the first item is omitted the data will not be interpreted and saved.
For JPEG marker segment levels see JPEG Non-Image Data Structure.
Name | Id | Type | Value Type | Value | Value Length | Read Only |
---|---|---|---|---|---|---|
"EXIF-JPEG" | IG_FORMAT_EXIF_JPEG | LEVEL_START | 0 | NULL | 0 | TRUE |
Exif APP1 marker segment level | ||||||
JPEG marker segment levels mixed in any way (if present) | ||||||
"EXIF-JPEG" | IG_FORMAT_EXIF_JPEG | LEVEL_END | 0 | NULL | 0 | TRUE |
Name | Id | Type | Value Type | Value | Value Length | Read Only |
---|---|---|---|---|---|---|
"APP1" | 65505 | LEVEL_START | 0 | NULL | 0 | TRUE |
"APP1_DATASIZE" | 60225 | VALUE_ITEM | UINT16 | <Data> | 1 | TRUE |
"EXIF_HEADER" | 59935 | VALUE_ITEM | STRING | "EXIF" | 5 | TRUE |
"TIF_HEADER" | 59936 | VALUE_ITEM | UINT16 | 0x4949 or 0x4D4D | 1 | TRUE |
IFD 0 level ( if present ) | ||||||
Thumbnail IFD level ( if present ) | ||||||
"APP1" | 0xFFE1 | LEVEL_END | 0 | NULL | 0 | TRUE |
For more detailed Exif information see EXIF-TIFF Non-Image Data Structure.
Makernote is a standard EXIF tag of UNDEFINED (byte) type. This tag usually is used as a "hidden" IFD. Makernote can not be read in and written out as a BLOB, because IFD offsets become invalid. Therefore, to preserve this tag while writing an image it's necessary to decode it during reading and re-encode it during writing, despite the fact that formally makernote is just a binary tag.
See enumIGEXIFMakerNoteType for descriptions of the various makernote types.
To present Makernote info in a convenient way ImageGear introduces a special structure as an addition to the standard EXIF Metadata: "Makernote*s* Wrapper IFD". Instead of a single binary Makernote*s* tag (37500), we are adding a virtual IFD, containing all the information about Makernote*s*.
'Makernote Wrapper IFD' has the following format depending on the 'type' tag:
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'MakerNote wrapper IFD' -------->'type' = IG_MAKERNOTE_TYPE_UNKNOWN -------->'binary MakerNote' Type IG_MAKERNOTE_TYPE_IFD: 'MakerNote wrapper IFD' -------->'type' = IG_MAKERNOTE_TYPE_IFD -------->'MakerNote IFD' ----------------> 'individual MakerNote tag 1' ----------------> 'individual MakerNote tag 2' ... ----------------> 'individual MakerNote tag N' -------->'binary MakerNote' Type IG_MAKERNOTE_TYPE_IFD_PREFIXED: 'MakerNote wrapper IFD' -------->'type' = IG_MAKERNOTE_TYPE_IFD_PREFIXED -------->'MakerNote IFD prefix' -------->'MakerNote IFD' ----------------> 'individual MakerNote tag 1' ----------------> 'individual MakerNote tag 2' ... ----------------> 'individual MakerNote tag N' -------->'binary MakerNote' Type IG_MAKERNOTE_TYPE_TIF_HEADER_PREFIXED: 'MakerNote wrapper IFD' -------->'type' = IG_MAKERNOTE_TYPE_TIF_HEADER_PREFIXED <The rest of the structure is identical to IG_MAKERNOTE_TYPE_IFD_PREFIXED> Type IG_MAKERNOTE_TYPE_IFD_PREFIXED_OFFSET_II: 'MakerNote wrapper IFD' -------->'type' = IG_MAKERNOTE_TYPE_IFD_PREFIXED_OFFSET_II <The rest of the structure is identical to IG_MAKERNOTE_TYPE_IFD_PREFIXED> |
If 'Makernote' EXIF tag is present in the file then ImageGear will always provide it in its original binary form via meta-data callback ('binary Makernote' tag) on the read side, and will also optionally provide it as a decoded sub-IFD (w/ or w/o prefix depending on how it is stored in the original file) if it can be decoded.
ImageGear will ignore 'binary Makernote' tag on the write side for the 'Makernote wrapper IFDs' that have 'type' other than IG_MAKERNOTE_TYPE_UNKNOWN - and construct 'Makernote' EXIF tag based on the 'Makernote IFD'.
ImageGear will store 'binary Makernote' to file 'as is' for the 'Makernote wrapper IFDs' that have 'type' set to IG_MAKERNOTE_TYPE_UNKNOWN.
If 'Makernote wrapper IFD' is not provided to ImageGear during saving operation then 'Makernote' EXIF tag will not be saved into the output file.
Makernote IFD tags are listed below:
Name | Id | Type | Value Type | Value | Value Length | Read Only |
---|---|---|---|---|---|---|
"IFD" | IGMDTAG_ID_EXIF_MAKERNOTE | LEVEL_START | 0 | NULL | 0 | FALSE |
"MakerNoteType" | IGMDTAG_ID_EXIF_MAKERNOTE_TYPE | VALUE_ITEM | UINT16 | enumIGEXIFMakerNoteType | 1 | FALSE |
"MakerNotePrefix" | IGMDTAG_ID_EXIF_MAKERNOTE_PREFIX | VALUE_ITEM | RAW_DATA | FALSE | ||
"MakerNoteBinary" | IGMDTAG_ID_EXIF_MAKERNOTE_BINARY | VALUE_ITEM | RAW_DATA | FALSE | ||
"IFD" | IGMDTAG_ID_EXIF_MAKERNOTE_DATA_IFD | LEVEL_START | 0 | NULL | 0 | FALSE |
"UNDEFINED" | VALUE_ITEM | RAW_DATA | FALSE | |||
... | ||||||
"IFD" | IGMDTAG_ID_EXIF_MAKERNOTE_DATA_IFD | LEVEL_END | 0 | NULL | 0 | FALSE |
"IFD" | IGMDTAG_ID_EXIF_MAKERNOTE | LEVEL_END | 0 | NULL | 0 | FALSE |
The following custom tags and IFDs are introduced for Makernote support:
Makernote Wrapper IFD: tag = 37500 (same as standard Makernote tag). This IFD is located in the "Exif IFD" (34665).
For information about new tags, which belong to the Makernote Wrapper IFD, see enumIGEXIFMakerNoteTagIDs.
Make | Model |
---|---|
Canon | Canon DIGITAL IXUS |
Canon | Canon EOS D30 |
Canon | Canon PowerShot G2 |
Canon | Canon PowerShot S50 |
FUJIFILM | FinePix4900Z |
LEICA | digilux 4.3 |
Minolta Co., Ltd. | DiMAGE 7i |
Nikon | E5000 (TIF) |
NIKON | E5700 |
NIKON | E950 |
OLYMPUS OPTICAL CO., LTD | C2040Z |
OLYMPUS OPTICAL CO., LTD | C960Z,D460Z |
Panasonic | DMC-LC5 |
RICOH | Caplio RR1 |
SANYO Electric Co., Ltd. | SR6 |
SANYO Electric Co., Ltd. | SX113 |
SANYO Electric Co., Ltd. | SX212 |
SEIKO EPSON CORP. | PhotoPC 850Z |
EXIF file format allows you to store Flashpix extensions in APP2 marker segments.
Name | Id | Type | Value Type | Value | Value Length | Read Only |
---|---|---|---|---|---|---|
"APP2" | 0xFFE2 | LEVEL_START | 0 | NULL | 0 | TRUE |
"APP2_DATASIZE" | 60226 | VALUE_ITEM | UINT16 | 1 | TRUE | |
"FPXR_HEADER" | 61221 | VALUE_ITEM | STRING | "FPXR" | 4 | FALSE |
"FPXRVersion" | 61222 | VALUE_ITEM | UINT8 | 1 | FALSE | |
"FPXRExtensionID" | 61223 | VALUE_ITEM | UINT8 | "1" | 1 | FALSE |
"FPXRInteroperabilityCount" | 61224 | VALUE_ITEM | UINT16 | <n> | 1 | FALSE |
Interoperability Entity level 0 | ||||||
... | ||||||
Interoperability Entity level <n> - 1 | ||||||
"APP2" | 0xFFE2 | LEVEL_END | 0 | NULL | 0 | TRUE |
Name | Id | Type | Value Type | Value | Value Length | Read Only |
---|---|---|---|---|---|---|
"InteroperabilityEntity" | <Ind.> | LEVEL_START | 0 | NULL | 0 | TRUE |
"EntitySize" | <Ind.> | VALUE_ITEM | UINT32 | 0xFFFFFFFF for Storage or <Variable> for Stream | 1 | FALSE |
"DefaultValue" | <Ind.> | VALUE_ITEM | UINT8 | "FPXR" | 4 | FALSE |
"Storage/StreamName" | <Ind.> | VALUE_ITEM | RAW_DATA | <Unicode name> | <Variable> | FALSE |
The next item is present only if "EntitySize" item value is equal 0xFFFFFFFF (Storage) | ||||||
"EntityClassID" | <Ind.> | VALUE_ITEM | RAW_DATA | 16 | FALSE | |
"InteroperabilityEntity" | <Ind.> | LEVEL_END | 0 | NULL | 0 | TRUE |
Name | Id | Type | Value Type | Value | Value Length | Read Only |
---|---|---|---|---|---|---|
"APP2" | 0xFFE2 | LEVEL_START | 0 | NULL | 0 | TRUE |
"APP2_DATASIZE" | 60226 | VALUE_ITEM | UINT16 | 1 | TRUE | |
"FPXR_HEADER" | 61221 | VALUE_ITEM | STRING | "FPXR" | 4 | FALSE |
"FPXRVersion" | 61222 | VALUE_ITEM | UINT8 | 1 | FALSE | |
"FPXRExtensionID" | 61223 | VALUE_ITEM | UINT8 | "2" | 1 | FALSE |
"FPXRIndexToContentsList" | 61225 | VALUE_ITEM | UINT16 | <Ind.>* | 1 | FALSE |
"FPXROffsetToStream" | 61226 | VALUE_ITEM | UINT32 | 1 | FALSE | |
"FPXRStreamData" | 61227 | VALUE_ITEM | RAW_DATA | <Variable> | FALSE | |
"APP2" | 0xFFE2 | LEVEL_END | 0 | NULL | 0 | TRUE |
*<Ind.> is pointer to appropriate "InteroperabilityEntity" of FPXR Contents List APP2 marker segment. <Ind.> value is between 0 and <n> - 1(<n> is the "FPXRInteroperabilityCount" item value of FPXR Contents List APP2 marker segment).
Name | Id | Type | Value Type | Value | Value Length | Read Only |
---|---|---|---|---|---|---|
"APP2" | 0xFFE2 | LEVEL_START | 0 | NULL | 0 | TRUE |
"APP2_DATASIZE" | 60226 | VALUE_ITEM | UINT16 | 1 | TRUE | |
"FPXR_HEADER" | 61221 | VALUE_ITEM | STRING | "FPXR" | 4 | FALSE |
"FPXRVersion" | 61222 | VALUE_ITEM | UINT8 | 1 | FALSE | |
"FPXRExtensionID" | 61223 | VALUE_ITEM | UINT8 | More than "2" | 1 | FALSE |
"FPXRData" | 61228 | VALUE_ITEM | RAW_DATA | <Variable> | FALSE | |
"APP2" | 0xFFE2 | LEVEL_END | 0 | NULL | 0 | TRUE |