Generate Thumbnails similar to Thumbnail browser control

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This topic and its replies were posted before the current version of LEADTOOLS was released and may no longer be applicable.

#1 Posted : Wednesday, August 29, 2007 8:21:40 AM(UTC)

cslater

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Posts: 9

I need to generate a thumbnail per page for a multi-page tif. I've tried loading the image and resizing but the resulting image is horrible. How can I mimic the images generated by the Thumbnail browser control? It's images are wonderful.

Thanks


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#2 Posted : Thursday, August 30, 2007 4:40:56 AM(UTC)

Maen Hasan

Groups: Registered, Tech Support
Posts: 1,326

Was thanked: 1 time(s) in 1 post(s)

Hello,

To create thumbnails from your image file, you may try to use the ReadThumbnail method.
+-------------------+
CodecsThumbnailOptions options;

options = CodecsThumbnailOptions.Default;

options.BackColor = new RasterColor(150, 150, 150);
options.BitsPerPixel = MyImage.BitsPerPixel;
options.DitheringMethod = RasterDitheringMethod.Clustered;
options.ForceSize = false;
options.Height = MyImage.Height / 5;
options.LoadStamp = false;
options.MaintainAspectRatio = true;
options.Order = RasterByteOrder.Rgb;
options.PaletteFlags = Leadtools.ImageProcessing.ColorResolutionCommandPaletteFlags.None;

options.Resample = true;
options.Width = MyImage.Width / 5;

RasterImage ThumbImage = codecs.ReadThumbnail(OpenFileDlg.FileName,options,2);

rasterImageViewer1.Image = ThumbImage.Clone() ;
ThumbImage.Dispose();
+-------------------+

Please let me know if this helps.

Thanks,
Maen Badwan
LEADTOOLS Technical Support

#3 Posted : Tuesday, September 18, 2007 6:15:09 AM(UTC)

masique

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Posts: 10

this method does'nt work. E.g. Bitonal Images generates different that displayed in RasterThumbnailBrowser.

#4 Posted : Tuesday, September 18, 2007 7:12:23 AM(UTC)

masique

Groups: Registered
Posts: 10

what if original bi-tonal image 5000x5000 and I need 100x100 thumbnail. This method also won't work.
you brutal hack "/ 5" will not mach :)

#5 Posted : Tuesday, September 18, 2007 7:38:54 AM(UTC)

BoydP

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Posts: 3,022

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Could you post some example images with which this doesn't work? Make sure to put them in a zip file if you are going to upload them to the forums.

Also, if you need a 100x100 thumbnail then you would just set the options.Width = 100 and options.Height = 100. The example used "/5" to display funtionality.

#6 Posted : Wednesday, September 19, 2007 12:07:18 AM(UTC)

masique

Groups: Registered
Posts: 10

http://b-union.com.ua/img/280.tif

here is the image

#7 Posted : Wednesday, October 3, 2007 6:52:28 AM(UTC)

BoydP

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Posts: 3,022

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I sincerely apologize for the delay in getting back to you, but this code will load images identical to the thumbnail browser:

CodecsImageInfo info = this.codecs.GetInformation("c:\\280.tif", false, 1);
int width = info.Width;
int height = info.Height;

//this will be the base for calculating the size of the loaded image
Rectangle imageRect = new Rectangle(0, 0, 100, 100);

//transforms the above rectangle to one with the same aspect ratio of the image
imageRect = RasterImageList.GetFixedAspectRatioImageRectangle(width, height, imageRect);

//Bicubic is the slowest resize method, resample will work as well
rasterImageViewer1.Image = codecs.Load("c:\\280.tif", imageRect.Width, imageRect.Height, 24, RasterSizeFlags.Bicubic, info.Order, 1, 1);

I hope this helps you and once again I apologize for the delay.

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