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Defines which edge of the “paper” the image’s “top” is aligned with. This information is used to adjust the frames to match the scanning orientation of the paper. For instance, if an ICAP_SUPPORTEDSIZE of TWSS_ISOA4 has been negotiated, and ICAP_ORIENTATION is set to TWOR_LANDSCAPE, then the Source must rotate the frame it downloads to the scanner to reflect the orientation of the paper.
ICAP_ORIENTATION affects the values reported by ICAP_FRAMES when using ICAP_SUPPORTEDSIZES.
ICAP_ORIENTATION is ignored when set using ICAP_FRAMES or DAT_IMAGELAYOUT.
The upper-left of the image is defined as the location where both the primary and secondary scans originate. (The X axis is the primary scan direction and the Y axis is the secondary scan direction.) For a flatbed scanner, the light bar moves in the secondary scan direction. For a handheld scanner, the scanner is drug in the secondary scan direction. For a digital camera, the secondary direction is the vertical axis when the viewed image is considered upright.
If one pivots the image about its center, then orienting the image in TWOR_LANDSCAPE has the effect of rotating the original image 90 degrees to the “left.” TWOR_PORTRAIT mode does not rotate the image. The image may be oriented along any of the four axes located 90 degrees from the unrotated image. Note that:
TWOR_ROT TWOR_PORTRAIT and TWOR_ROT TWOR_LANDSCAPE.
The Source is responsible for rotating the image if it allows this capability to be set.
Type: TW_UINT
Value after MSG_OPENDS: (may be remembered from a previous session)
After MSG_RESET/MSG_RESETALL: TWOR_PORTRAIT
Allowed Values: TWOR_ROT TWOR_ROT TWOR_ROT TWOR_ROT
TWOR_PORTRAIT equals TWOR_ROT TWOR_LANDSCAPE equals TWOR_ROT
MSG_GET TW_ONEVALUE TW_ENUMERATION
MSG_GETCURRENT TW_ONEVALUE
MSG_GETDEFAULT TW_ONEVALUE
MSG_SET TW_ONEVALUE
MSG_SETCONSTRAINT TW_ONEVALUE
TW_ENUMERATION
MSG_RESET TW_ONEVALUE
MSG_QUERYSUPPORT TW_ONEVALUE
None
Version 1.0
ICAP_AUTOSIZE ICAP_MIRROR ICAP_ROTATION
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The TWAIN Toolkit is distributed as is. The developer and distributors of the TWAIN Toolkit expressly disclaim all implied, express or statutory warranties including, without limitation, the implied warranties of merchantability, noninfringement of third party rights and fitness for a particular purpose. Neither the developers nor the distributors will be liable for damages, whether direct, indirect, special, incidental, or consequential, as a result of the reproduction, modification, distribution or other use of the TWAIN Toolkit.
