L_AdjustBitmapTint

#include "l_bitmap.h"

L_INT EXT_FUNCTION L_AdjustBitmapTint(pBitmap, nAngleA, nAngleB)

pBITMAPHANDLE pBitmap;	/* pointer to the bitmap handle */
L_INT nAngleA;	/* angular amount to change the A angle */
L_INT nAngleB;	/* angular amount to change the B angle */

Adjusts the bitmap tint by changing the colors in an image by using two separate color wheel rotations. This function is available in the Raster Pro and above toolkits.

Parameter	Description
pBitmap	Pointer to the bitmap handle that references the bitmap to which to apply the effect.
nAngleA	Value that represents the amount of change in the A angle, in hundredths of degrees. Valid values range between –18000 and 18000.
nAngleB	Value that represents the amount of change in the B angle, in hundredths of degrees. Valid values range between –18000 and 18000.

Returns

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

Comments

This function changes the colors in an image by using two separate color wheel rotations. For the nAngleA parameter, a positive rotation takes blue toward green and red, as shown in the following figure:

$image\nAngleA.gif$

Negative rotation has the opposite effect. For the nAngleB parameter, a positive rotation takes red toward green. Negative rotation has the opposite effect.

Use the L_ChangeBitmapHue function to rotate the color wheel in either direction using one angle change that changes each color in the image. 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 only supports colored images.

This function supports 48 and 64 bit color images.

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.

See Also

Functions:	L_ChangeBitmapHue, 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_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_SampleTargetBitmap
Topics:	Raster Image Functions: Modifying Intensity Values
	Correcting Colors
	Raster Image Functions: Correcting Colors

Example

/* The following example loads a bitmap and adjusts the tint: */
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);
/* Rotate the A angle by –65 and the B angle by 20 *
/L_AdjustBitmapTint(&LeadBitmap, -6500, 2000 );