Actual orientation of image data. 0x0114 ∙ 276

IG_ISIS_TAG_DATAORIENTATION indicates or specifies the orientation when getting data from certain scanner drivers. If IG_ISIS_TAG_DATAORIENTATION is implemented in the scanner driver, then the scanner has the capability of internally rotating the image and the driver can be queried to determine whether or not the scanner is rotating the image.

Type:

IG_ISIS_TAG_TYPE_SHORT

Values:

IG_ISIS_TAG_DATAORIENTATION can be set to any one of the following values:

1	IG_ISIS_ORIENTATION_PORT	The image data is in portrait orientation.
2	IG_ISIS_ORIENTATION_LAND	The image data is in landscape orientation.
3	IG_ISIS_ORIENTATION_180	The image data is in upside-down portrait orientation.
4	IG_ISIS_ORIENTATION_270	The image data is in upside-down landscape orientation.
5	IG_ISIS_ORIENTATION_PORTM	The image data is in portrait mirrored orientation.
6	IG_ISIS_ORIENTATION_LANDM	The image data is in landscape mirrored orientation.
7	IG_ISIS_ORIENTATION_180M	In ISIS, the image data is in upside down portrait, mirrored orientation.
8	IG_ISIS_ORIENTATION_270M	The image data is in upside down landscape, mirrored orientation.

Remarks:

In ISIS, check for the existence of IG_ISIS_TAG_DATAORIENTATION in the currently-selected scanner driver. If this tag exists, check its choices to determine the rotation the scanner is capable of delivering. It you are scanning a portrait, letter-sized page sideways ("Scan and Rotate") to achieve better throughput, AND the scanner implements IG_ISIS_TAG_DATAORIENTATION, AND IG_ISIS_TAG_DATAORIENTATION is IG_ISIS_TAG_DATAORIENTATION_PORT, then the scanner is rotating the data for you, and you should not rotate it. On the other hand, if IG_ISIS_TAG_DATAORIENTATION is not implemented OR if IG_ISIS_TAG_DATAORIENTATION is set to IG_ISIS_TAG_DATAORIENTATION_LAND, then the scanner is not rotating the data for you and you should rotate it.

See Also

IG_ISIS_TAG_ORIENTATION

IG_ISIS_TAG_SCANORIENTATION