RemapHueCommand Class (original) (raw)
Summary
Uses a lookup table to change an image's hue values. The saturation and value tables change S and V values only if a particular hue value is marked as non-zero in the Mask property. It is used for all resolutions, including 48 and 64-bit images.
Syntax
C#
Objective-C
C++/CLI
Java
Python
@interface LTRemapHueCommand : LTRasterCommand public class RemapHueCommand
extends RasterCommand
class RemapHueCommand(RasterCommand): Example
Run the RemapHueCommand on an image and change all green hues (and hues near green).
using Leadtools;
using Leadtools.Codecs;
using Leadtools.ImageProcessing.Color;
public int INCREMENT_S1(int x, int Length)
{
return ((x + 1) % Length);
}
public int DECREMENT_S1(int x, int Length)
{
return ((x + (Length - 1)) % Length);
}
public int ADD_S1(int x, int y, int Length)
{
return ((x + y) % Length);
}
public void RemapHueCommandCommandExample()
{
// Load an image
RasterCodecs codecs = new RasterCodecs();
codecs.ThrowExceptionsOnInvalidImages = true;
RasterImage image = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "cannon.jpg"));
// Prepare the command
int[] MaskTable;
int[] HueTable;
RasterHsvColor hsvRef;
int HueGreen, HueChange;
int Change;
int i, Count;
int Length;
if (image.BitsPerPixel >= 48)
Length = 0x10000;
else if (!(image.BitsPerPixel == 16 || image.BitsPerPixel == 12))
Length = 256;
else if (image.GetLookupTable() != null && image.UseLookupTable)
Length = 256;
else
Length = (1 << image.BitsPerPixel);
//Allocate tables
MaskTable = new int[Length];
HueTable = new int[Length];
//Initialize tables
for (i = 0; i < Length; i++)
{
MaskTable[i] = 0;
HueTable[i] = i;
}
//Get the hue for green
hsvRef = RasterHsvColor.FromRasterColor(new RasterColor(0, 255, 0));
HueGreen = hsvRef.H;
//Obtain new hue
hsvRef = RasterHsvColor.FromRasterColor(new RasterColor(255, 128, 0));
Change = (int)hsvRef.H - (int)HueGreen;
HueChange = (Change > 0) ? (int)Change : (int)(Change + Length - 1);
HueGreen *= (Length - 1) / 255;
HueChange *= (Length - 1) / 255;
//Set values in HueTable, MaskTable
HueTable[HueGreen] = (HueTable[HueGreen] + HueChange);
MaskTable[HueGreen] = 1;
//set the hues near green (+/- 15)
Count = (15 * (Length - 1)) / 255;
for (i = INCREMENT_S1(HueGreen, Length); Count > 0; i = INCREMENT_S1(i, Length), Count--)
{
HueTable[i] = ADD_S1(HueTable[i], HueChange, Length);
MaskTable[i] = 1;
}
Count = (15 * (Length - 1)) / 255;
for (i = DECREMENT_S1(HueGreen, Length); Count > 0; i = DECREMENT_S1(i, Length), Count--)
{
HueTable[i] = ADD_S1(HueTable[i], HueChange, Length);
MaskTable[i] = 1;
}
RemapHueCommand command = new RemapHueCommand(MaskTable, HueTable, null, null, Length);
command.Run(image);
codecs.Save(image, Path.Combine(LEAD_VARS.ImagesDir, "Result.jpg"), RasterImageFormat.Jpeg, 24);
}
static class LEAD_VARS
{
public const string ImagesDir = @"C:\LEADTOOLS22\Resources\Images";
}