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Use this capability and ICAP_JPEGQUALITY as a shortcut to select JPEG quantization. Used in concert with DAT_JPEGCOMPRSSION it is possible for an Application to obtain the tables that are appropriate for varying percentages of quality within a given Source. It has meaning for color images only.
If requested image is bitonal or grayscale, return TWRC_FAILURE TWCC_CAPSEQERROR. Type: TW_UINT
Value after MSG_OPENDS: (may be remembered from a previous session)
After MSG_RESET/MSG_RESETALL: (selected by the data source writer)
Allowed Values: TWJS_ YCBCR TWJS_ RGB TWJS_
TWJS_ TWJS_ TWJS_ TWJS_ TWJS_
MSG_GET 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 2.2
ICAP_COMPRESSION ICAP_JPEGQUALITY
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