Re: Windows Image Acquisition library problems

Tech-Archive recommends: Repair Windows Errors & Optimize Windows Performance

This is how I am doing it...

WIA.ImageProcess ImageProcess1 = new WIA.ImageProcess();

Object Ob1 = null;
Object Ob2 = null;

Ob1 = (Object)"Convert";
ImageProcess1.Filters.Add(ImageProcess1.FilterInfos.get_Item(ref
Ob1).FilterID, 0);

Ob1 = (Object)"FormatID";
Ob2 = (Object)WIA.FormatID.wiaFormatJPEG;
ImageProcess1.Filters[1].Properties.get_Item(ref
Ob1).set_Value(ref Ob2);

Ob1 = (Object)"Quality";
Ob2 = ScanQuality;
ImageProcess1.Filters[1].Properties.get_Item(ref
Ob1).set_Value(ref Ob2);

Ob1 = null;
Ob2 = null;

The ScanQuality is a setting I have stored in my app.config file. It is a
value between 1 and 100, the higher the number, the higher the quality (the
lower the compression and the larger the file). I have mine set to 70


--
Best regards,
Dave Colliver.
http://www.AshfieldFOCUS.com
~~
http://www.FOCUSPortals.com - Local franchises available


"Joe Cool" <joecool1969@xxxxxxxx> wrote in message
news:2d00ae98-2632-4fae-9f4c-73491c7c91af@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
On Dec 16, 11:01 am, "David"
<david.colliver.N...@xxxxxxxxxxxxxxxxxxxxxxx> wrote:
Hi,

If you have been reading the group recently, you will have seen that I
have
been having WIA problems, but a different set of problems. I am using the
Transfer rather than ShowAcquireImage so that I don't pop-up the scanner
interface and have more buttons to press.

However, I noticed that same issue. I also noticed that I had to
specifically set the resolution of the scanner to get a reasonable file
size
as it tended to scan at max resolution. However, as you are using the
interface, it should take your interface details.

I also noticed that if I set the scanner colour settings AFTER I set the
resolution, my resolution settings would also be reset.

I don't have an answer to the problem you are raising, but have accepted
that if I want to ensure it is a jpg and control the compression settings,
then I have to use the filters.

I have not tested the sample code I found for conversion, but it
appears to just convert BMP (or whatever) to JPG. How do you adjust
the compression settings with the filters?


--
Best regards,
Dave Colliver.http://www.AshfieldFOCUS.com
~~http://www.FOCUSPortals.com- Local franchises available

"Joe Cool" <joecool1...@xxxxxxxx> wrote in message

news:f2dac47a-d321-48a2-ad0b-dbb99f7612d7@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx



I am trying to add some simple scanning code to an app to use my WIA
compliant scanner. I have downloaded and installed the WIAAUT.DLL I
found some sample C#.NET code that uses WIA and have a simple test app
that will invoke my scanner's WIA driver UI that lets me run a preview
scan, mask the area I want to scan, adjust the DPI, etc, and then
scan. All well and good.

Here's the rub. It doesn't matter what value I pass to the FormatID
property, the returned ImageFile object is ALWAYS in Window BMP
format!! I want to save as JPG. But the saved file is always the same
exact length and an image editor says that they are all BMP files.

I have found some code that uses the WIA ImageProcess class that can
convert a BMP file to a JPG file, but why should I have to do that?

Sample Code:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Drawing.Imaging;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using WIA;

namespace WIAScanner
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}

private void button1_Click(object sender, EventArgs e)
{
WIA.CommonDialogClass scanner;
ImageFile imageObject;

scanner = new CommonDialogClass();
imageObject = scanner.ShowAcquireImage
(WiaDeviceType.ScannerDeviceType, WiaImageIntent.ColorIntent,
WiaImageBias.MinimizeSize,
ImageFormat.Jpeg.Guid.ToString("B"), false, true,
true);
MessageBox.Show(string.Format("File Extension = {0}\n
\nFormat = {1}", imageObject.FileExtension, imageObject.FormatID));
imageObject.SaveFile(@"E:\test.jpg");
MessageBox.Show("Done");
}
}
}


.

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