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Using the LBitmapBase::CreateFadedMask function:

When using the LBitmapBase::CreateFadedMask function, the general process is as follows:

Create an LBitmapBase object and use it to load an image.
Set a region in the image using an LBitmapRgn object.
Create another LBitmapBase object to hold the fade mask and call the function on the images object. The images below show various fade masks resulting from the use of various flags. For these images, the following values were also used:

Region type: rounded rectangle.

nLength = 50; 
nFadeRate = 15; 
nStepSize = 3; 
nMaxGray = 255; 
crTransparent = RGB(255, 0, 0);

First: without using FADE_OUTER

1) No Flag

transparency

$image\Noflag.gif$

2) FADE_WHITETOBLACK

$image\WhtToBlk.gif$

3) FADE_DUMPFILL

$image\Dump.gif$

4) FADE_DUMPFILL | FADE_WHITETOBLACK

$image\Dump_WTB.gif$

5) FADE_DUMPFILL | FADE_FILLCOLOR_START

$image\Dump_FillColor.gif$

6) FADE_DUMPFILL | FADE_FILLCOLOR_START | FADE_WHITETOBLACK

$image\Dump_FillColor_WTB.gif$

7) FADE_DUMPFILL | FADE_NOTRANSPARENCY

$image\Dump_Notrans.gif$

8) FADE_DUMPFILL | FADE_NOTRANSPARENCY | FADE_TRANSPARENCY_ DUMPCOLOR

$image\Dump_Notrans_DumpColor.gif$

plus many other possibilities.

Region type:

rounded rectangle smaller than the above region, nInflate = 60

1) FADE_OUTER

$image\Notrans_outer.gif$

2) FADE_OUTER | FADE_WHITETOBLACK

$image\WTB_outer.gif$

3) FADE_OUTER | FADE_DUMPFILL

$image\Dump_outer.gif$

4) FADE_OUTER | FADE_DUMPFILL | FADE_WHITETOBLACK

$image\Dump_WTB_outer.gif$

5) FADE_OUTER | FADE_DUMPFILL | FADE_WHITETOBLACK| FADE_NOTRANSPARENCY

$image\Dump_WTB_Notrans_outer.gif$

and so on.

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LEADTOOLS Raster Imaging C++ Class Library Help