private void TrimShadow(Bitmap bitmap)
{
int sizeLimit = 10;
int alphaLimit = 200;
using (UnsafeBitmap unsafeBitmap = new UnsafeBitmap(bitmap, true))
{
for (int i = 0; i < sizeLimit; i++)
{
int y = i;
int width = bitmap.Width;
// Left top
for (int x = 0; x < sizeLimit; x++)
{
if (unsafeBitmap.GetPixel(x, y).Alpha < alphaLimit)
{
unsafeBitmap.ClearPixel(x, y);
}
else
{
break;
}
}
// Right top
for (int x = width - 1; x > width - sizeLimit - 1; x--)
{
if (unsafeBitmap.GetPixel(x, y).Alpha < alphaLimit)
{
unsafeBitmap.ClearPixel(x, y);
}
else
{
break;
}
}
y = bitmap.Height - i - 1;
// Left bottom
for (int x = 0; x < sizeLimit; x++)
{
if (unsafeBitmap.GetPixel(x, y).Alpha < alphaLimit)
{
unsafeBitmap.ClearPixel(x, y);
}
else
{
break;
}
}
// Right bottom
for (int x = width - 1; x > width - sizeLimit - 1; x--)
{
if (unsafeBitmap.GetPixel(x, y).Alpha < alphaLimit)
{
unsafeBitmap.ClearPixel(x, y);
}
else
{
break;
}
}
}
}
}
private static void TrimShadow(Bitmap bitmap)
{
int sizeLimit = 10;
int alphaLimit = 200;
using (UnsafeBitmap unsafeBitmap = new UnsafeBitmap(bitmap, true, ImageLockMode.ReadWrite))
{
for (int i = 0; i < sizeLimit; i++)
{
int y = i;
int width = bitmap.Width;
// Left top
for (int x = 0; x < sizeLimit; x++)
{
if (unsafeBitmap.GetPixel(x, y).Alpha < alphaLimit)
{
unsafeBitmap.ClearPixel(x, y);
}
else
{
break;
}
}
// Right top
for (int x = width - 1; x > width - sizeLimit - 1; x--)
{
if (unsafeBitmap.GetPixel(x, y).Alpha < alphaLimit)
{
unsafeBitmap.ClearPixel(x, y);
}
else
{
break;
}
}
y = bitmap.Height - i - 1;
// Left bottom
for (int x = 0; x < sizeLimit; x++)
{
if (unsafeBitmap.GetPixel(x, y).Alpha < alphaLimit)
{
unsafeBitmap.ClearPixel(x, y);
}
else
{
break;
}
}
// Right bottom
for (int x = width - 1; x > width - sizeLimit - 1; x--)
{
if (unsafeBitmap.GetPixel(x, y).Alpha < alphaLimit)
{
unsafeBitmap.ClearPixel(x, y);
}
else
{
break;
}
}
}
}
}