![]() ![]() The model name or model number of the equipment. When the field is left blank, it is treated as unknown. This is the manufacturer of the DSC, scanner, video digitizer or other equipment that generated the image. The manufacturer of the recording equipment. When a 2-bytes code is necessary, the Exif Private tag is to be used. Two-bytes character codes cannot be used. It may be a comment such as "1988 company picnic" or the like. ![]() The name of the document from which this image was scanned.Ī character string giving the title of the image. The length of the dithering or halftoning matrix used to create a dithered or halftoned bilevel file. The width of the dithering or halftoning matrix used to create a dithered or halftoned bilevel file. In JPEG compressed data a JPEG marker is used instead of this tag.įor black and white TIFF files that represent shades of gray, the technique used to convert from gray to black and white pixels. When thumbnails use JPEG compression, this tag value is set to 6. When a primary image is JPEG compressed, this designation is not necessary and is omitted. The compression scheme used for the image data. In JPEG compressed data a JPEG marker is used instead of this tag. In this standard each component of the image is 8 bits, so the value for this tag is 8. The number of columns of image data, equal to the number of pixels per row. The NewSubfileType field should be used instead. The name and version of the software used to post-process the picture.Ī general indication of the kind of data contained in this subfile.Ī general indication of the kind of data contained in this subfile. The second part of the Exiv2 key of an IFD1 tag is Thumbnail (instead of Image), the other two parts of the key are the same as for IFD0 tags. All IFD0 tags may also be present in IFD1, according to the standard. Theĭates are specified as yyyy:mm:dd.These are the Exif tags as defined in the Exif 2.3 standard. Including leap years and daylight savings time changes. Out exactly how many days the timestamp needs to be adjusted by, The time offset is thus speci-įied as a difference between two dates, so that jhead can figure Incorrectly, such as having date and time reset by batteryīecause different months and years have different numbers ofĭays in them, a simple offset for months, days, years would lead Used when fixing dates from cameras where the date was set Works like -ta, but for specifying large date offsets, to be Including "DateTimeOriginal" (tag 0x9003) and "DateTimeDigi. This option changes all Date/time fields in the exif header, Or when daylight savings time has changed. Set on the camera, such as after travelling across time zones, ![]() Useful when having taken pictures with the wrong time If you happen to have the wrong-set camera still at hand and still wrong, I find it handy to take a shot of a (time-synced) digital clock - then, take the date shown in the picture as "newdate" and the date in the metadata as "olddate" for the parameters below.Īdjust time stored in the Exif header by h:mm backwards or for. It has a simple adjust by-hours command, but for big changes it also has an old -> new syntax which computes the difference for you (so you don't have to worry about leap years and so on). You have to format the dates correctly, but it's easy to do by following the examples (see the documentation I've included below). If you're not used to command-line programs, this is a pretty non-intimidating one because there's not a lot to it. It's completely free (and open source) and is easily available for Windows, Mac, or Linux. The simple command-line program jhead is great for this. ![]()
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