public class ClearNegativePixelsCommand : RasterCommand
Public Class ClearNegativePixelsCommand
Inherits RasterCommand
@interface LTClearNegativePixelsCommand : LTRasterCommand
public class ClearNegativePixelsCommand extends RasterCommand
public ref class ClearNegativePixelsCommand : public RasterCommand
If CodecsLoadOptions.Signed is true when a file is loaded, the image may contain negative pixel values and LEADTOOLS will paint/process the image incorrectly. In order to use this image correctly, you must user ClearNegativePixelsCommand. If the CodecsLoadOptions.Signed property is false, all negative pixels are cleared internally, during the load process.
Since some TIFF files are saved with negative values for pixel colors, you should use ClearNegativePixelsCommand if, after loading an image, RasterImage.Signed is true. ClearNegativePixelsCommand does nothing if RasterImage.IsSigned is false.
Programming tip: use ClearNegativePixelsCommand right after loading the image from file.
For more information, refer to Introduction to Image Processing With LEADTOOLS.
This example sets the Signed flag in the load options, loads a tif file and clears the negative pixels.
using Leadtools;
using Leadtools.Codecs;
using Leadtools.ImageProcessing;
public void ClearNegativePixelsCommandExample()
{
RasterCodecs codecs = new RasterCodecs();
string srcFileName = Path.Combine(LEAD_VARS.ImagesDir, "Image1.cmp");
string destFileName = Path.Combine(LEAD_VARS.ImagesDir, "CleanNegativePixelsCommand.tif");
// Load the CMP file and convert it to TIF
RasterImage image = codecs.Load(srcFileName);
image.Signed = true;
codecs.Save(image, destFileName, RasterImageFormat.Tif, 24);
image.Dispose();
// Load this image as signed
codecs.Options.Load.Signed = true;
// Load the source image from disk
image = codecs.Load(destFileName);
Assert.IsTrue(image.Signed);
// Clear the negative pixels and save it it back
ClearNegativePixelsCommand command = new ClearNegativePixelsCommand();
command.Run(image);
Assert.IsTrue(!image.Signed);
codecs.Save(image, destFileName, RasterImageFormat.Tif, 24);
// Clean up
image.Dispose();
codecs.Dispose();
}
static class LEAD_VARS
{
public const string ImagesDir = @"C:\LEADTOOLS21\Resources\Images";
}
Imports Leadtools
Imports Leadtools.Codecs
Imports Leadtools.ImageProcessing
Public Sub ClearNegativePixelsCommandExample()
Dim codecs As RasterCodecs = New RasterCodecs()
Dim srcFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "Image1.cmp")
Dim destFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "CleanNegativePixelsCommand.tif")
' Load the CMP file and convert it to TIF
Dim image As RasterImage = codecs.Load(srcFileName)
image.Signed = True
codecs.Save(image, destFileName, RasterImageFormat.Tif, 24)
image.Dispose()
' Load this image as signed
codecs.Options.Load.Signed = True
' Load the source image from disk
image = codecs.Load(destFileName)
Debug.Assert(image.Signed)
' Clear the negative pixels and save it it back
Dim command As ClearNegativePixelsCommand = New ClearNegativePixelsCommand()
command.Run(image)
Debug.Assert((Not image.Signed))
codecs.Save(image, destFileName, RasterImageFormat.Tif, 24)
' Clean up
image.Dispose()
End Sub
Public NotInheritable Class LEAD_VARS
Public Const ImagesDir As String = "C:\LEADTOOLS21\Resources\Images"
End Class
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