VoyForums
[ Show ]
Support VoyForums
[ Shrink ]
VoyForums Announcement: Programming and providing support for this service has been a labor of love since 1997. We are one of the few services online who values our users' privacy, and have never sold your information. We have even fought hard to defend your privacy in legal cases; however, we've done it with almost no financial support -- paying out of pocket to continue providing the service. Due to the issues imposed on us by advertisers, we also stopped hosting most ads on the forums many years ago. We hope you appreciate our efforts.

Show your support by donating any amount. (Note: We are still technically a for-profit company, so your contribution is not tax-deductible.) PayPal Acct: Feedback:

Donate to VoyForums (PayPal):

[ Login ] [ Contact Forum Admin ] [ Main index ] [ Post a new message ] [ Search | Check update time | Archives: 1, 2, 3, 4, 5, 6, 7, 8, [9], 10 ]

[ Next Thread | Previous Thread | Next Message | Previous Message ]

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,

Michel


> 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

[ Next Thread | Previous Thread | Next Message | Previous Message ]
[ Contact Forum Admin ]

Forum timezone: GMT-5
VF Version: 3.00b, ConfDB:
Before posting please read our privacy policy.
VoyForums(tm) is a Free Service from Voyager Info-Systems.
Copyright © 1998-2019 Voyager Info-Systems. All Rights Reserved.