private static int SetColorValues(byte[] rVals, HslParams classicStripperParams, byte[] gVals, byte[] bVals, byte s, byte l, byte h)
{
var colorValues = 0;
var val1 = classicStripperParams.HslSelectionType == HslSelectionType.Sat ? s : l;
var val2 = classicStripperParams.LumSatVal;
if (val1 != val2)
{
var ascending = val1 < val2;
while ((ascending && val1 < val2) || (!ascending && val1 > val2))
{
if (ascending)
{
val1++;
}
else
{
val1--;
}
colorValues++;
if (classicStripperParams.HslSelectionType == HslSelectionType.Sat)
{
Hsl.Hsl2Rgb(ref rVals[colorValues], ref gVals[colorValues], ref bVals[colorValues], h, val1, l);
}
else
{
Hsl.Hsl2Rgb(ref rVals[colorValues], ref gVals[colorValues], ref bVals[colorValues], h, s, val1);
}
}
}
return(colorValues);
}
public static int Process(Bitmap image, HslParams @params)
{
//Define the color values
var rVals = new byte[255];
var gVals = new byte[255];
var bVals = new byte[255];
rVals[0] = @params.R;
gVals[0] = @params.G;
bVals[0] = @params.B;
var colorValues = 0;
byte h;
byte s;
byte l;
Hsl.Rgb2Hsl(rVals[0], gVals[0], bVals[0], out h, out s, out l);
if (@params.HslSelectionType == HslSelectionType.Sat || @params.HslSelectionType == HslSelectionType.Lum)
{
colorValues = SetColorValues(rVals, @params, gVals, bVals, s, l, h);
}
//End of defining the color values
//Loop through the image pixels to set them to the background color
var pixelsModified = 0;
for (var y = 0; y < image.Height; y++)
{
for (var x = 0; x < image.Width; x++)
{
var color = image.GetPixel(x, y);
var matched = false;
switch (@params.HslSelectionType)
{
case HslSelectionType.CurAndBrighter:
case HslSelectionType.CurAndDarker:
byte tempH;
byte tempS;
byte tempL;
Hsl.Rgb2Hsl(color.R, color.G, color.B, out tempH, out tempS, out tempL);
matched = ((@params.HslSelectionType == HslSelectionType.CurAndBrighter && tempL >= l) ||
(@params.HslSelectionType == HslSelectionType.CurAndDarker && tempL <= l));
break;
case HslSelectionType.Sat:
case HslSelectionType.Lum:
for (var colorsCtr = 0; colorsCtr <= colorValues; colorsCtr++)
{
if (Math.Abs(color.R - rVals[colorsCtr]) <= 1 &&
Math.Abs(color.G - gVals[colorsCtr]) <= 1 &&
Math.Abs(color.B - bVals[colorsCtr]) <= 1)
{
matched = true;
break;
}
}
break;
}
if (!matched)
{
continue;
}
image.SetPixel(x, y, @params.BackgroundColor);
pixelsModified++;
}
}
return(pixelsModified);
}