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#1 Posted : Thursday, October 8, 2009 3:51:20 AM(UTC)
a.bologni

Groups: Registered
Posts: 17


I have a Kodak scanner i1320 and i use this portion of code to scan image:

            _twain = new TwainSession();
            _twain.Startup(_viewer, "", "", "", "", TwainStartupFlags.None);
            _twain.AcquirePage += new EventHandler<TwainAcquirePageEventArgs>(_Twain_AcquirePage);

            TwainCapability twnCap = new TwainCapability();
            twnCap.Information.Type = TwainCapabilityType.ImagePixelType;
            twnCap.Information.ContainerType = TwainContainerType.OneValue;
            twnCap.OneValueCapability.ItemType = TwainItemType.Uni512;
            twnCap.OneValueCapability.Value = Leadtools.Twain.TwainCapabilityValue.PixelTypeRgb;
            _twainSession.SetCapability(twnCap, TwainSetCapabilityMode.Set);

The image that is scanned is in a grey scale and not with color.
My scanner have the ADF, and have 2 sources: the bottom source is "KODAK Scanner: i1310/i1320", the top source is "WIA-KODAK i1320 Scanner".

What can i do for scan a color image?

Thanks

A.
 

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#2 Posted : Sunday, October 11, 2009 12:49:57 AM(UTC)

Basel  
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In your code, you are Acquiring the page before setting the capability. That could be the reason you are not scanning in color.
So please try to use your code as follows:
twain = new TwainSession();
_twain.Startup(_viewer, "", "", "", "", TwainStartupFlags.None);

TwainCapability twnCap = new TwainCapability();
twnCap.Information.Type = TwainCapabilityType.ImagePixelType;
twnCap.Information.ContainerType = TwainContainerType.OneValue;
twnCap.OneValueCapability.ItemType = TwainItemType.Uni512;
twnCap.OneValueCapability.Value = Leadtools.Twain.TwainCapabilityValue.PixelTypeRgb;
_twainSession.SetCapability(twnCap, TwainSetCapabilityMode.Set);

_twain.AcquirePage += new EventHandler(_Twain_AcquirePage);

 
#3 Posted : Tuesday, October 13, 2009 6:38:57 AM(UTC)
a.bologni

Groups: Registered
Posts: 17


I had hoped in your solution but is not the problem.
This is my complete acquire code:

            RasterCodecs.Startup();

            _codecs = new RasterCodecs();

            _viewer = new RasterImageViewer();

            _twain = new TwainSession();
            _twain.Startup(_viewer, "", "", "", "", TwainStartupFlags.None);

            TwainCapability twnCap = new TwainCapability();
            twnCap.Information.Type = TwainCapabilityType.ImagePixelType;
            twnCap.Information.ContainerType = TwainContainerType.OneValue;
            twnCap.OneValueCapability.ItemType = TwainItemType.Uni512;
            twnCap.OneValueCapability.Value = Leadtools.Twain.TwainCapabilityValue.PixelTypeRgb;
            _twain.SetCapability(twnCap, TwainSetCapabilityMode.Set);

            _twain.AcquirePage += new EventHandler<TwainAcquirePageEventArgs>(_Twain_AcquirePage);

            _twainSource = "WIA-KODAK i1320 Scanner";
            _twain.SelectSource(_twainSource);

            _twain.ShowProgressIndicator(false);

            string imageName = DateTime.Now.ToString("yyyyMMddhhmmss");

            _Ext_ = _Ext_Tif_;

            imageName += _Ext_Tif_;

            _imageLocalPath = Path.Combine(_workDir, imageName);

            _frameCount = 0;

            if (_Ext_ == _Ext_Tif_)
                _imageStream = new FileStream(_imageLocalPath, FileMode.Create);

            _twain.Acquire(TwainUserInterfaceFlags.None);
           
            _imageStream.Close();

            ImageScannerShutdown();


The result is a BW image and not a color image.
What can i do?

Thanks.

A.
 
#4 Posted : Wednesday, October 14, 2009 6:23:19 AM(UTC)

Basel  
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Posts: 3,028

Was thanked: 2 time(s) in 2 post(s)

There are at least 2 errors you your code:
1. Your order of execution is still wrong. You are doing this:
- Set pixel type
- Select source
- Acquire
The correct order is:
- Select source first, so that the pixel type will affect that source
- Set pixel type
- Acquire

2. You are using an incorrect constant for the OneValueCapability.ItemType. Instead of TwainItemType.Uni512, it should be TwainItemType.Int16
 
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