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 Black scanned images in XP

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T O P I C    R E V I E W
AndyColmes Posted - Mar 05 2012 : 08:02:02
I have a TWAIN scanning program that runs fine in Windows 7 but when used in Windows XP, the scanned images are black. What are the possible reasons that could be the cause of this issue?
12   L A T E S T    R E P L I E S    (Newest First)
AndyColmes Posted - Mar 19 2012 : 22:39:03
Looks like it might be an issue with the TWAIN since I cannot duplicate it on other devices or my own computer as well.
fab Posted - Mar 18 2012 : 13:56:25
In my tests (with XP and several devices) I doesn't happen, so I cannot replicate this problem, I'm sorry.
AndyColmes Posted - Mar 13 2012 : 11:30:31
I am also getting memory errors when scanning at 600 dpi repeatedly. It will do it once but a second or more times give a "out of memory" status from the TWAIN. is this an issue with the TWAIN or ImageEn? It also seems to happen only on a Windows XP computer.
AndyColmes Posted - Mar 07 2012 : 10:49:09
I will have the customer try that and I will report back here. Thanks.
fab Posted - Mar 07 2012 : 10:33:07
Please could you try another workstation with the same scanner and a different (newer?) scanner driver version?
Have you the same problem with Multi\MultiView demo?
AndyColmes Posted - Mar 07 2012 : 08:50:55
TwainDemo also has the same problem. Scans fine on first Acquire, but second and subsequent acquires, give black images and sometimes freezes the application. I am using the Plustek scanner in Windows XP.
AndyColmes Posted - Mar 07 2012 : 02:46:44
Can I use the event OnFinishWork to automatically save the file after the image is acquired? Or do I have to resort to using TImageEnIO since it has a OnAcquireBitmap event? If yes, there is no demo that uses a TImageEnIO that I can test.
fab Posted - Mar 06 2012 : 07:23:47
You could try "Multi\MultiView" demo. It acquire using ADF and allows you to save acquired pages.
Anyway if you see the image in the preview then the image is acquired (they are not "black").
AndyColmes Posted - Mar 06 2012 : 06:49:27
Allacquire demo freezes after the first scan. But TwainDemo works ok. I still need to know how to save the image after the scan.
AndyColmes Posted - Mar 06 2012 : 06:01:59
I found AllAquire demo that has the ADF. How do you save the image as soon as the scan is complete? There used to be a OnAcquireBitmap event before that I could save the file.
AndyColmes Posted - Mar 06 2012 : 05:48:26
Which demo uses the Automatic Document Feeder which I need in order to test?
fab Posted - Mar 05 2012 : 11:25:30
Please could you test the compiled demo (i.e. ImageEn twain demo)?