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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