LBitmapBase::SetDefaultDithering (original) (raw)
Summary
Specifies the default dithering method to use when converting an image from 32, 24, or 16 bits per pixel to 8 bits per pixel or fewer.
Syntax
#include "ltwrappr.h"
L_INT LBitmapBase::SetDefaultDithering(uMethod)
Parameters
L_UINT uMethod
The dithering mode to be set for the bitmap. This is the local dithering mode for the class object and will not affect the global dithering mode. The dithering mode will be set when painting the bitmap. Possible values are:
| Value | Meaning |
|---|---|
| NO_DITHERING | [0] Use no dithering. |
| FLOYD_STEIN_DITHERING | [1] Use the Floyd-Steinberg method. |
| BURKES_DITHERING | [3] Use the Burkes method. |
| STUCKI_DITHERING | [2] Use the Stucki method. |
| SIERRA_DITHERING | [4] Use the Sierra method. |
| STEVENSON_ARCE_DITHERING | [5] Use the Stevenson-Arce method. |
| JARVIS_DITHERING | [6] Use the Jarvis method. |
| ORDERED_DITHERING | [7] Use ordered dithering, which is faster than other methods but is lower in quality. |
| CLUSTERED_DITHERING | [8] Use clustered dithering. |
Returns
| Value | Meaning |
|---|---|
| SUCCESS | The function was successful. |
| < 1 | An error occurred. Refer to Return Codes. |
Comments
Use this function to set the default dithering mode for the class object. The local setting will be set when painting the bitmap.
Some LEADTOOLS functions automatically dither an image when necessary for display. Those functions use the default dithering method that this function specifies.
For general information about dithering, refer to Color Resolution and Dithering.
Required DLLs and Libraries
- LTDIS
- LTFIL
- 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
Win32, x64.
See Also
Functions
- LBitmapBase::GetDefaultDithering
- LBitmapBase::EnableLocalSettings
- LBitmapBase::IsLocalSettingsEnabled
- Class Members
Topics
- Raster Image Functions: Doing Color Expansion or Reduction
- Raster Image Functions: Doing Color Space Conversions
- Raster Image Functions: Palettes
- Color Resolution and Dithering
Example
L_INT LBitmapBase__SetDefaultDitheringExample()
{
L_INT nRet;
LBitmapBase MyBitmap;
nRet =MyBitmap.Load(MAKE_IMAGE_PATH(TEXT("image1.cmp")),24);
if(nRet !=SUCCESS)
return nRet;
nRet =MyBitmap.SetDefaultDithering(CLUSTERED_DITHERING);
if(nRet !=SUCCESS)
return nRet;
return SUCCESS;
}
LEADTOOLS Raster Imaging C++ Class Library Help