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 scannedĪ 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. These are the Exif tags as defined in the Exif 2.3 standard.
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