Image Properties

[si_ben]

I’m trying to obtain an Image with the following specifications with no success…

.Tiff (FileType)
300 DPI (X,Y)
BitDepth (1)
Compression : CCITT T.6 (Group4)
W(InPixels) 2550
H(InPixels) 3300 (Letter Size)

My Device doesn’t ‘support’ Compression or it won’t let me set it for some other reason and I also cannot use the
ICAP_ImageFileFormat.

I set my DPI like so :

case (short)TwCap.IYResolution:

// (Capability, 300DPI)

t_Cap = new TwCapability(TwCap.IYResolution, 300);



rc = DScap(appid, srcds, TwDG.Control, TwDAT.Capability, TwMSG.Set, t_Cap);

// Check Result

if (rc != TwRC.Success)

{

Report_Status();

}

break;

I get success code from the set. Okay when I get to

// Declare new instance of Image Information

TwImageInfo iinf = new TwImageInfo();



// Get Current Image Info

rc = DSiinf(appid, srcds, TwDG.Image, TwDAT.ImageInfo, TwMSG.Get, iinf);

if (rc != TwRC.Success)

{

CloseSrc();

return pics;

}



// Set to Native Transfer

rc = DSixfer(appid, srcds, TwDG.Image, TwDAT.ImageNativeXfer, TwMSG.Get, ref hbitmap);

if (rc != TwRC.XferDone)

{

CloseSrc();

return pics;

}

my iinf DOES Reflect the capabilities I set (I also set like B&W and stuff). When my image is saved and I view the properties, the DPI is 96, BitDepth is 32 and its RGB.

Other notes, I chose not to show the UserInterface. So it never pops up. Right before I start scanning all the settings are proper. Im using NativeImageXfr.

The only thing that I can determine is that there is a function that runs :

public Image ImageFromIntPtr(IntPtr imagePtr)

{

BITMAPINFOHEADER bmpInfoHeader = new BITMAPINFOHEADER();



IntPtr bmpptr = GlobalLock(imagePtr);

IntPtr pixptr = GetPixelInfo(bmpptr, bmpInfoHeader);



Bitmap bitmap = new Bitmap(bmpInfoHeader.biWidth, bmpInfoHeader.biHeight);

Graphics graphics = Graphics.FromImage(bitmap);



IntPtr hdc = graphics.GetHdc();



SetDIBitsToDevice(hdc, 0, 0, bmpInfoHeader.biWidth, bmpInfoHeader.biHeight,

0, 0, 0, bmpInfoHeader.biHeight, pixptr, bmpptr, 0);



graphics.ReleaseHdc(hdc);



return (Image)bitmap;

}

Thing is I dont know how to manipulate the fields of BITMAPINFOHEADER(). Whats going on!! When I use Twirl and I set the same capabilities it comes out like it should with the 300 DPI. What am I doing that messes up this image??

[si_ben]

I found one way to apply the compression and the DPI that I needed. Seems like there is more than one way to do it, but it was in my .Save() method [OfType(Image)].. Originally I was saving it just as (FileLocation, Image Extension)

Here is the following code that helped me obtain my result :

/// 


/// Save Button

/// 


/// 

/// 

private void button2_Click(object sender, EventArgs e)

{

List list = nessScanning1.ImagesList;

int i = 1;

foreach (Image img in list)

{

ImageCodecInfo myImageCodecInfo;

System.Drawing.Imaging.Encoder myEncoder;

EncoderParameter myEncoderParameter;

EncoderParameters myEncoderParameters;



myImageCodecInfo = GetEncoderInfo("image/tiff");



myEncoder = System.Drawing.Imaging.Encoder.Compression;



myEncoderParameters = new EncoderParameters(1);



myEncoderParameter = new EncoderParameter(myEncoder, (long)EncoderValue.CompressionCCITT4);

myEncoderParameters.Param[0] = myEncoderParameter;

Bitmap image;

image = new Bitmap(img);

image.SetResolution(300,300);

image.Save(string.Format("C:\Temp\Pic_{0}.tiff", i++), myImageCodecInfo, myEncoderParameters);

}

}



private static ImageCodecInfo GetEncoderInfo(String mimeType)

{

int j;

ImageCodecInfo[] encoders;

encoders = ImageCodecInfo.GetImageEncoders();

for (j = 0; j < encoders.Length; ++j)

{

if (encoders[j].MimeType == mimeType)

return encoders[j];

}

return null;

}

So if your scanner cannot support (CompressionFileType) there is still a way to obtain the result…

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