LBitmap::HistoContrast
#include "ltwrappr.h"
virtual L_INT LBitmap::HistoContrast(nChange)
L_INT nChange; |
/* amount of contrast change */ |
Increases or decreases the contrast of the image in the class object's bitmap, using a histogram to determine the median brightness.
Parameter |
Description |
nChange |
Amount of contrast change. Valid values are -1000 to +1000. |
Returns
SUCCESS |
The function was successful. |
< 1 |
An error occurred. Refer to Return Codes. |
Comments
This function finds the median brightness of the image; then brightens the pixels with values above the median and darkens the pixels with values below the median. This is more sophisticated (but slower) than the LBitmap::ChangeContrast function, which uses the middle possible value (128) rather than finding the actual median.
To update a status bar or detect a user interrupt during execution of this function, refer to LBase::EnableStatusCallback.
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.
Required DLLs and Libraries
LTDIS For a listing of the exact DLLs and Libraries needed, based on the toolkit version, refer to Files To Be Included With Your Application. |
See Also
Example
LBitmap LeadBitmap;
LeadBitmap.Load(TEXT("image1.cmp"), 0,ORDER_BGR);
LeadBitmap.HistoContrast(250);