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#1 Posted : Wednesday, July 12, 2006 10:21:12 PM(UTC)

jschoi  
jschoi

Groups: Registered
Posts: 1


Question!!(Sorry, I can't use english well )

- make thumbnail (source is 500MB tiff file, or raw file)

- use Raster Imaging Pro .Net ver 14.5

- don't loading all image, using minimum memory possibly (ex. envi image viewer)

- fast possiblly

 

How can I do?

 

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#2 Posted : Friday, July 14, 2006 11:21:11 AM(UTC)

GregR  
GregR

Groups: Registered, Tech Support, Administrators
Posts: 764


The following VB.NET code sample loads a large image file (105MB in my test) and saves out an 8KB 50x50 thumbnail.  This took about 8 seconds to run on a n AMD 1500 GHz with 512 RAM.  Of course your 500MB file will take longer, but if it is has multiple pages and you only want to make a thumbnail of the first page, it will not take as long.

        'load
        img = codecs.Load("D:\test images\really big.tif", 0, CodecsLoadByteOrder.BgrOrGray, 1, 1)

        'change image size
        img2 = New RasterImage(RasterMemoryFlags.Managed, 50, 50, img.BitsPerPixel, img.Order, img.ViewPerspective, img.Palette, Nothing)
        Dim r As New ResizeCommand(img2, RasterSizeFlags.Normal)
        r.Run(img)

        'save
        codecs.Save(img2, "d:\junk folder\thumb.tif", RasterImageFormat.Tif, 24)
 
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