>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