Very simple too.

The most simple aproach is to use either GETPICTUREVALFROMHBITMAP() or GetPictureVal() functions.

For more options, please read carefully the commented lines:

** HOWTO: Get a Monochromatic 1 bit per pixel image

DO LOCFILE("System.App")

WITH _SCREEN.System.Drawing
   * Create a Bitmap object based on a BMP file.
   LOCAL loOriginalBmp AS xfcBitmap
   loOriginalBmp = .Bitmap.New(GETPICT())

   LOCAL loMonoChrBmp as xfcBitmap
   loMonoChrBmp = loOriginalBmp.GetMonochrome()

   * Dispose the original Bitmap because we don't need it any more
   loOriginalBmp = NULL
	
   * Save the created Monochromatic Bmp
*   loMonochrBmp.Save("c:\Monochromatic.bmp", .Imaging.ImageFormat.Bmp)

   * Get the Image binaries directly:
   LOCAL lcImgBinaries
   lcImgBinaries = loMonochrBmp.GetPictureValFromHBitmap()

   * For a different image format than BMP, a little slower, but if you use this the image format will not be 1bpp any more:
*   LOCAL lcImgBinaries
*   lcImgBinaries = loMonochrBmp.GetPictureVal(.Imaging.ImageFormat.Jpeg)


ENDWITH

RETURN

>Thanks for gdiplusx. getmonochrome() and example start me up.
>
>May i know is it possible to return a binary stream (like from filetostr()) from xfcBitmap object so i can save the string to memo file rightaway ?
>
>Thank you.
>
>
>>>Dear Cesar
>>>
>>>How are you ?
>>>I know you are very interested in using GDI :)
>>>In fact, i would like to convert the color jpg to 1bit black/white file for special purpose printing. could you enlighting me ? Tks
>>>
>>
>>See if this helps you:
>>
>>PS: Requires GdiPlusX
>>
>>
>>
>>

** HOWTO: Get a Monochromatic 1 bit per pixel image
>>
>>DO LOCFILE("System.App")
>>
>>WITH _SCREEN.System.Drawing
>>   * Create a Bitmap object based on a BMP file.
>>   LOCAL loOriginalBmp AS xfcBitmap
>>   loOriginalBmp = .Bitmap.New(GETPICT())
>>
>>   LOCAL loMonoChrBmp as xfcBitmap
>>   loMonoChrBmp = loOriginalBmp.GetMonochrome()
>>
>>   * Dispose the original Bitmap because we don't need it any more
>>   loOriginalBmp = NULL
>>	
>>   * Save the created Monochromatic Bmp
>>   loMonochrBmp.Save("c:\Monochromatic.bmp", .Imaging.ImageFormat.Bmp)
>>ENDWITH
>>
>>RETURN