_CRmaskFromBitmap

_CRmaskFromBitmap

Required : scol v4.5

Create a bitmap8 alpha mask, from the bitmap object, in converting the bitmap colors into black or white.
The palette of the bitmap8 object is reseted as a grayscale palette.

ObjBitmap8 _CRmaskFromBitmap (

Chn _channel_

ObjBitmap _bitmap_

I _white_color_

I _black_color_

)

Parameters

_channel_

object channel

_bitmap_

any 24bits bitmap

_white_color_

24bits color to be converted as white. can be nil.

_black_color_

24bits color to be converted as black. can be nil.

Return value

a 8bits paletted bitmap, to be used in alphabitmap

_channel_
	object channel
_bitmap_
	any 24bits bitmap
_white_color_
	24bits color to be converted as white. can be nil.
_black_color_
	24bits color to be converted as black. can be nil.