L_ChangeBitmapHue

#include "l_bitmap.h"

L_INT EXT_FUNCTION L_ChangeBitmapHue(pBitmap, nAngle)

pBITMAPHANDLE pBitmap;	/* pointer to the bitmap handle */
L_INT nAngle;	/* angular amount to change the hue, in degrees */

Changes the hue of colors in a bitmap by rotating the color wheel.

Parameter	Description
pBitmap	Pointer to the bitmap handle that references the bitmap to be affected.
nAngle	Angular amount to change the hue, in degrees.

Returns

SUCCESS	The function was successful.
< 1	An error occurred. Refer to Return Codes.

Comments

This function can rotate the color wheel in either direction. A 180-degree rotation in either direction changes each color to its complement. Positive rotation takes red toward green, green toward blue, and blue toward red. Negative rotation has the opposite effect.

This function supports 12 and 16-bit grayscale and 48 and 64-bit color images. Support for 12 and 16-bit grayscale and 48 and 64-bit color images is available only in the Document/Medical toolkits.

To update a status bar or detect a user interrupt during execution of this function, refer to L_SetStatusCallback.

This function does not support signed data images. It returns the error code ERROR_SIGNED_DATA_NOT_SUPPORTED if a signed data image is passed to this function.

Required DLLs and Libraries

LTIMG

For a listing of the exact DLLs and Libraries needed, based on the toolkit version, refer to Files To Be Included With Your Application.

Platforms

Windows 95 / 98 / Me, Windows 2000 / XP, Windows CE.

See Also

Functions:	L_ChangeBitmapIntensity, L_GammaCorrectBitmap,
	L_ChangeBitmapContrast, L_HistoContrastBitmap,
	L_StretchBitmapIntensity, L_RemapBitmapIntensity,
	L_InvertBitmap, L_ChangeBitmapSaturation,
	L_HistoEqualizeBitmap, L_FillBitmap, L_GetPixelColor,
	L_PutPixelColor, L_GetBitmapHistogram,
	L_DlgHue, L_ChannelMix, L_LightControlBitmap, L_SmoothEdgesBitmap, L_LocalHistoEqualizeBitmap, L_AddWeightedBitmaps, L_ColorMergeBitmap, L_ColorSeparateBitmap, L_ConvertColorSpace, L_MultiplyBitmap, L_AutoColorLevelBitmap, L_ColorLevelBitmap, L_SelectiveColorBitmap, L_ChangeHueSatIntBitmap, L_ColorReplaceBitmap, L_ColorThresholdBitmap, L_MathFunctionBitmap, L_AdaptiveContrastBitmap, L_ApplyMathLogicBitmap, L_ColorIntensityBalance, L_ContBrightIntBitmap, L_FunctionalLightBitmap, L_MultiScaleEnhancementBitmap, L_SelectBitmapData, L_ShiftBitmapData, L_AdjustBitmapTint, L_ColorHalfToneBitmap
Topics:	Raster Image Functions: Modifying Intensity Values
	Correcting Colors
	Raster Image Functions: Correcting Colors

Example

For complete sample code, refer to the CHILD.C module of the DEMO example.

/* This example loads a bitmap and changes its hue. */
BITMAPHANDLE LeadBitmap; /* Bitmap handle to hold the loaded image. */
/* Load the bitmap, keeping the bits per pixel of the file */
L_LoadBitmap (TEXT("IMAGE1.CMP"), &LeadBitmap, sizeof(BITMAPHANDLE), 0, ORDER_BGR, NULL, NULL);
/* Change each color to its complement */
L_ChangeBitmapHue(&LeadBitmap, 180 );