save(or convert) image in monochrome bitmap [RESOLVED]

[ahfatt]

Hello friends!
i'm facing a little problem and hope you guys can help.

SITUATION

i have a monochrome bitmap file called abc.bmp
i called this file in VB6 using loadpicture() and put it in a picture box. After manipulated the picture (invert and flip vertical) to another picturebox( called picBmp2), i've called the savepicture method in VB6---SavePicture(picBmp2.Image, "c:\modified.bmp")
to save the modified picture.

the problem is :
Windows did save the file but in 24-bit bitmap. But what i desired is only a 1-bit monochrome bitmap file. The original file is also in monochrome mode. This image file will send to a thermal printer(black and white) to print out. Now i can only open the MSPAINT and manually save as monochrome the modified 24-bit bitmap. It would be great if i can straight get a monochrome bitmap.

some data:
original file---- monochrome bitmap 462 bytes
bitmapOffset=62 bytes

after save-----24 bit bitmap 6454 bytes
bitmapOffset=54 bytes



Please help.
Thank you very much.