L_ChangeBitmapSaturation
#include "l_bitmap.h"
L_INT EXT_FUNCTION L_ChangeBitmapSaturation(pBitmap, nChange)
pBITMAPHANDLE pBitmap; |
/* pointer to the bitmap handle */ |
L_INT nChange; |
/* amount to change saturation */ |
Increases or decreases the saturation of colors in a bitmap.
Parameter |
Description |
pBitmap |
Pointer to the bitmap handle that references the bitmap to be affected. |
nChange |
Amount to change saturation. Values are percentages between -1000 and +1000. |
Returns
SUCCESS |
The function was successful. |
< 1 |
An error occurred. Refer to Return Codes. |
Comments
Negative values decrease the saturation of colors. Positive values increase the saturation. The saturation level is increased or decreased by a percentage of its present saturation level. For example, an increase of 20% of the current saturation level "L" will raise the new saturation level "L1" to a value L + 0.20 * L. Likewise, increasing the saturation level 100% doubles the saturation level ( L1 = L + 1.0 * L). Decreasing the saturation level 100% will set the new saturation level to 0. This process is carried out for every pixel.
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
Example
For complete sample code, refer to the CHILD.C module of the DEMO example.
/* This example loads a bitmap and increases its color saturation. */
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);
/* Increase the color saturation by 25 percent of the possible range */
L_ChangeBitmapSaturation(&LeadBitmap, 250 );