L_TwainGetImageEffects

#include "lttwn.h"

L_LTTWN_API L_INT L_TwainGetImageEffects(hSession, ulFlags, pBrightness, pContrast, pHighlight)

HTWAINSESSION hSession;

handle to an existing TWAIN session

L_UINT32 ulFlags;

optional flags

pTW_FIX32 pBrightness;

pointer to a variable

pTW_FIX32 pContrast;

pointer to a variable

pTW_FIX32 pHighlight;

pointer to a variable

Gets the current brightness, highlight and contrast values used when transferring images from the current TWAIN source.

Parameter Description
hSession Handle to an existing TWAIN session. This handle is obtained by calling the L_TwainInitSession or L_TwainInitSession2 function.
ulFlags Flags that indicate which capability values to get. Possible values are:
  Value Meaning
  TWAIN_NEGOTIATE_BRIGHTNESS [0x0010] Gets the brightness capability value.
  TWAIN_NEGOTIATE_CONTRAST [0x0020] Gets the contrast capability value.
  TWAIN_NEGOTIATE_HIGHLIGHT [0x0040] Gets the highlight capability value.
pBrightness Pointer to a variable to be updated with the current brightness capability value. For more information on possible values, refer to www.twain.org and click on TWAIN Specification (Version 2.0).
pContrast Pointer to a variable to be updated with the current contrast capability value. For more information on possible values, refer to www.twain.org and click on TWAIN Specification (Version 2.0).
pHighlight Pointer to a variable to be updated with the current highlight capability value. For more information on possible values, refer to www.twain.org and click on TWAIN Specification (Version 2.0).

Returns

SUCCESS

The function was successful.

< 1

An error occurred. Refer to Return Codes.

Comments

This function gets the current brightness capability ICAP_BRIGHTNESS, highlight capability ICAP_HIGHLIGHT, and contrast capability ICAP_CONTRAST values. For more information on these capabilities, refer to www.twain.org and click on TWAIN Specification (Version 2.0).

To set these capabilities, call L_TwainSetImageEffects function.

This function should be called after calling the L_TwainStartCapsNeg function and before calling the L_TwainEndCapsNeg function.

Required DLLs and Libraries

LTTWN

For a listing of the exact DLLs and Libraries needed, based on the toolkit version, refer to Files to be Included with your Application.

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