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#1 Posted : Wednesday, June 16, 2010 9:12:21 AM(UTC)

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I am using the RasterImageViewer for an image processing application. I use the Leadtools filters and functions extensively. However, there are a couple of filters that I need to run which are not supplied by Leadtools. So ... I need to extract a bitmap from the RasterImage, manipulate it with my filter routines and then place it back into the RasterImage. Not sure how to do this, can you help. Using imaging toolkit version 16.5 Pro. Thanks in advance

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#2 Posted : Thursday, June 17, 2010 5:43:41 AM(UTC)


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You can use CreateGdiPlusGraphics Method which creates a GDI+ Graphics object using the RasterImage.

Using CreateGdiPlusGraphics, you don't need to place the image back into the RasterImage. The RasterImage will be affected with your effects.

For more information please see the help topic "CreateGdiPlusGraphics Method" in our .NET help file.
#3 Posted : Thursday, June 17, 2010 6:38:11 AM(UTC)

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Thanks for the reply.
However, I don't want to manipulate the graphics surface. I need to extract a bitmap which is passed to methods that carry out pixel-level manipulations and then I need to reinsert/reload the bitmap into the RasterImage.
#4 Posted : Friday, June 18, 2010 7:01:50 AM(UTC)


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There are a couple ways you could go about getting access to the data within a RasterImage. One would be to use the read-only Data property (and the DataSize property). You could also use the GetRow/GetRowColumn and the SetRow/SetRowColumn methods to get a byte array of the specified data.

If your methods require a .NET Image to be used, you could use the TestGdiPlusCompatible, MakeGdiPlusCompatible, and ConvertToGdiPlus image methods.

After making your changes, you can then use the overloaded RasterImage contructors to then use the bitmap with LEADTOOLS again.

The RasterImage class also has ToDib/FromDib methods as well.
Walter Bates
Senior Support Engineer
LEAD Technologies, Inc.
#5 Posted : Tuesday, May 30, 2017 8:44:45 AM(UTC)

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There is a blog post that covers different ways to access the image data.

Do it in the Buffer: Comparison of RasterImage Image Data Access Methods in .NET

There are several ways to access the data in a RasterImage. If you need to get the RGB values of each pixel, then the GetPixel() and GetRow() methods are the simplest methods to use.

Few Pixels
If you need to get just one pixel, then GetPixel() is the easiest. GetPixel() works with image data of any Read more...
Gabriel Smith
LEAD Technologies, Inc.

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