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Date Posted: 07:45:37 10/23/00 Mon
Author: Michel
Subject: Re: Convert from HBitmap to TBitmap
In reply to: Tomaz Koritnik 's message, "Convert from HBitmap to TBitmap" on 15:31:51 10/22/00 Sun

Hi Tomaz,

Some twain librairies name the returned handle as a HBITMAP but it is probably a DIB handle,

which is really a handle to a memory block allocated by windows.

It is strange that your image is converted to 24 bit. That means that your scanner probably

returned it as 24 bit. I have done a lot of B/W scanning without problems. Are you sure your

scanner options are properly set? You may also try the precompiled Envision Demo.Exe and

check if the image is returned as 24 bit by doing a format conversion operation after

scanning an image.

Best regards,


> I have a problem. When I scan an image, twain returns
> HBITMAP. I use TBitmapgraphic and I call
> AssignFromDIBHandle (AssignFromBitapHandle does not
> work because I get invalid bitmap error) to load
> (convert) HBitmap image to BitmapGraphic. Image is
> converted but with one BIG problem. I acquire 1bit
> (Black/White) image but conveted bitmap
> (bitmapgraphic) is 24bit, so A4 format scanned with
> 300dpi is 35MB in size!!??. I don't know how this is
> posible. BitmapGraphic should also be 1bit. Can
> someone please help me.
> Tomaz

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