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#1 Posted : Monday, February 27, 2006 12:43:39 AM(UTC)

samadhi  
samadhi

Groups: Registered
Posts: 1


High everybody! [:D]

I'm using C# .NET for processing some 8-bit grayscale images. The appropriate .NET pixel format used was PixelFormat.Format8bppIndexed. I could access separate pixels by locking a bitmap inside unsafe block and then work with pixels directly as an array of bytes.

Then I decided to upgrade my program to process 16-bit grayscale images. Sadly, .NET format PixelFormat.Format16bppGrayScale is not functioning at all. So I gave a try to Leadtools 14.5 Raster Imaging Pro! But it turned out that I need to go back to .NET Bitmap in order to process it pixel-by-pixel [<:o)] like this:

IRasterImage srcImage;

...

if(srcImage.TestGdiPlusCompatible()

{

   Bitmap bmpImage = (Bitmap) srcImage.ChangeToGdiPlusImage(ChangeToGdiPlusImageFlags.None);

   BitmapData bmpData = bmpImage.LockBits(new Rectangle(0, 0, width, height), ImageLockMode.ReadOnly, bmpImage.PixelFormat);

   unsafe

   {

   byte* bmp = (byte *) bmpData.Scan0.ToPointer();

   // DO ALL PIXEL-WISE STUFF HERE...

   //   ...

   }

   bmpImage.UnlockBits(bmpData);

}

OK then, but it didn't work with 16-bit anyway! For instance, when I load 16-bit grayscale TIFF or PNG into srcImage, I get that my image is NOT GDI+ compatible [U] 

And if I set the conversion flag to ChangeToGdiPlusImageFlags.ForceChange, it results in a 24-bit RGB bmpImage bitmap.

So, the question is:

How to process 16-bit grayscale images in Leadtools .NET pixel-by-pixel ?

I'm looking forward for your replies [B]

 

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#2 Posted : Tuesday, February 28, 2006 5:09:16 AM(UTC)

Amin  
Amin

Groups: Manager, Tech Support
Posts: 356


Unlike LEADTOOLS Document Imaging, GDI bitmaps do not support 16 bit
grayscale. However you do NOT need to convert to a GID bitmap to get
the pixel data. There are several ways to do it. The easiest is to use
the Leadtools.IRasterImage.GetPixelData method. Here's a simple code sample:

   Leadtools.IRasterImage rasterImage = codecs.Load("16bitGrayscale.tif");
   int x=50, y=60;
   long pixelValue;
   byte[] Data = rasterImage.GetPixelData(y, x);
   pixelValue = Data[0] + Data[1] * 0x100;

Amin Dodin

Senior Support Engineer
LEAD Technologies, Inc.
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