Gets the total number of entries between the start color and the end color, and the index of the last occurrence of the start color. The start and end colors are determined internally.
public static CountLookupTableColorsResult CountLookupTableColorsExt(
RasterColor16[] lookupTable,
CountLookupTableColorsType type
)
Public Shared Function CountLookupTableColorsExt( _
ByVal lookupTable() As RasterColor16, _
ByVal type As CountLookupTableColorsType _
) As CountLookupTableColorsResult
+ (nullable LTCountLookupTableColorsResult *)countLookupTableColorsExt:(nullable NSArray<LTRasterColor16 *> *)lookupTable
type:(LTCountLookupTableColorsType)type
error:(NSError **)error
public static CountLookupTableColorsResult countLookupTableColorsExt(
RasterColor16[] lookupTable,
CountLookupTableColorsType type
)
public:
static CountLookupTableColorsResult CountLookupTableColorsExt(
array<RasterColor16>^ lookupTable,
CountLookupTableColorsType type
)
lookupTable
16-bit-bit lookup table array to be filled by this method.
type
Flag that indicates whether the LookupTable contains signed or unsigned data.
Suppose you have a LookupTable with 4096 colors, the first 200 colors are black and the last 30 are white, the rest of the colors between black and white are gray. This is what the method will provide : NumberOfEntries (property of CountLookupTableColorsResult) : 3868. FirstIndex (property of CountLookupTableColorsResult) : 199.
In more detail this is: Total number of entries: 4096 (0 - 4095). First index of the end color: 4095 - 30 + 1 (+1 to add the first index of the end color to the range). Number of occurrences of the starting color: 200 (0 - 199). The last index of the start color: 199. Total number of entries: (4095 - 30 + 1) - 199 + 1.
This method supports 12 and 16-bit grayscale images. Support for 12 and 16-bit grayscale images is available only in the Document/Medical toolkits.
Run the CountLookupTableColorsExt method to get the number of entries and start index from the image.
using Leadtools;
using Leadtools.Codecs;
using Leadtools.ImageProcessing;
using Leadtools.ImageProcessing.Core;
using LeadtoolsExamples.Common;
public void CountLookupTableColorsExtExample()
{
// Load an image
RasterCodecs codecs = new RasterCodecs();
codecs.ThrowExceptionsOnInvalidImages = true;
RasterImage image = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "Image2.dcm"));
// Prepare the command
CountLookupTableColorsResult command = CoreUtilities.CountLookupTableColorsExt(image.GetLookupTable16(), CountLookupTableColorsType.Signed);
MessageBox.Show("First Index = " + command.FirstIndex + "\n" +
"Number Of Entries = " + command.NumberOfEntries);
}
static class LEAD_VARS
{
public const string ImagesDir = @"C:\Users\Public\Documents\LEADTOOLS Images";
}
Imports Leadtools
Imports Leadtools.Codecs
Imports Leadtools.ImageProcessing.Core
Public Sub CountLookupTableColorsExtExample()
Dim codecs As New RasterCodecs()
codecs.ThrowExceptionsOnInvalidImages = True
Dim leadImage As RasterImage = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "IMAGE2.dcm"))
' Prepare the command
Dim command As CountLookupTableColorsResult = CoreUtilities.CountLookupTableColorsExt(leadImage.GetLookupTable16, CountLookupTableColorsType.Signed)
MessageBox.Show("First Index = " + command.FirstIndex.ToString + Chr(13) + "Number Of Entries = " + command.NumberOfEntries.ToString)
End Sub
Public NotInheritable Class LEAD_VARS
Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images"
End Class
c#[Silverlight C# Example]
using Leadtools;
using Leadtools.Examples;
using Leadtools.Codecs;
using Leadtools.ImageProcessing.Core;
public void CountLookupTableColorsExtExample(RasterImage image)
{
// Prepare the command
CountLookupTableColorsResult command = CoreUtilities.CountLookupTableColorsExt(image.GetLookupTable16(), CountLookupTableColorsType.Signed);
Debug.WriteLine("First Index = " + command.FirstIndex + "\n" +
"Number Of Entries = " + command.NumberOfEntries);
image.Dispose();
}
vb[Silverlight VB Example]
Imports Leadtools
Imports Leadtools.Codecs
Imports Leadtools.ImageProcessing.Core
Public Sub CountLookupTableColorsExtExample(ByVal image As RasterImage)
' Prepare the command
Dim command As CountLookupTableColorsResult = CoreUtilities.CountLookupTableColorsExt(image.GetLookupTable16(), CountLookupTableColorsType.Signed)
Debug.WriteLine("First Index = " & command.FirstIndex + Constants.vbLf & "Number Of Entries = " & command.NumberOfEntries)
image.Dispose()
End Sub
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