Ok. Here's the thing:

I want to put an image (pointer) to screen and mask the black pixel !

1. With GetImage and PutImage you can extract an render bitmaps with the graph
unit. Simply extract the rectangular portion of the screen you want to put the
pointer on, write your own bitmap routines to do the masking of the black color,
and render the bitmap back into the video memory. Of course you should keep a
copy of the original background so you can erase the pointer again.

2. There are quite a few alternatives to the graph unit available on the
internet. Some are good, some not, some are compatible with the Graph unit other
are not. Let me do some self-promotion here, everybody seems to do it, you get
get my VESA256 unit at:

http://home.worldonline.nl/~wpdejong/vesa.html

I would describe this unit as 'good' but 'not completely compatible'. It does
allow you to mask out color number 0 however (SpriteBlit). There are more
compatible units out there but most are shareware, and you don't get the source
code.

Peter de Jong
wpdej...@worldonline.nl