Windows Image Acquisition library problems
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From: Joe Cool on 16 Dec 2009 09:00 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"); } } }
From: David on 16 Dec 2009 11:01 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. -- Best regards, Dave Colliver. http://www.AshfieldFOCUS.com ~~ http://www.FOCUSPortals.com - Local franchises available "Joe Cool" <joecool1969(a)live.com> wrote in message news:f2dac47a-d321-48a2-ad0b-dbb99f7612d7(a)h2g2000vbd.googlegroups.com... >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"); > } > } > }
From: Joe Cool on 16 Dec 2009 11:44 On Dec 16, 11:01 am, "David" <david.colliver.N...(a)revilloc.REMOVETHIS.com> 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...(a)live.com> wrote in message > > news:f2dac47a-d321-48a2-ad0b-dbb99f7612d7(a)h2g2000vbd.googlegroups.com... > > > > >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"); > > } > > } > > }
From: David on 16 Dec 2009 12:30 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(a)live.com> wrote in message news:2d00ae98-2632-4fae-9f4c-73491c7c91af(a)t19g2000vbc.googlegroups.com... On Dec 16, 11:01 am, "David" <david.colliver.N...(a)revilloc.REMOVETHIS.com> 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...(a)live.com> wrote in message > > news:f2dac47a-d321-48a2-ad0b-dbb99f7612d7(a)h2g2000vbd.googlegroups.com... > > > > >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"); > > } > > } > > }
From: David on 16 Dec 2009 12:32
Oops, I forgot a little bit to add to it... once you have set the filter, you apply it to your scan... ImageObject = ImageProcess1.Apply(ImageObject); This has to be done after your scan. -- Best regards, Dave Colliver. http://www.AshfieldFOCUS.com ~~ http://www.FOCUSPortals.com - Local franchises available "Joe Cool" <joecool1969(a)live.com> wrote in message news:2d00ae98-2632-4fae-9f4c-73491c7c91af(a)t19g2000vbc.googlegroups.com... On Dec 16, 11:01 am, "David" <david.colliver.N...(a)revilloc.REMOVETHIS.com> 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...(a)live.com> wrote in message > > news:f2dac47a-d321-48a2-ad0b-dbb99f7612d7(a)h2g2000vbd.googlegroups.com... > > > > >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"); > > } > > } > > } |