private void rgbLinearFiltersItem_Click(object sender, System.EventArgs e)
{
LevelsLinear filter = new LevelsLinear();
filter.InRed = new IntRange(30, 230);
filter.InGreen = new IntRange(50, 240);
filter.InBlue = new IntRange(10, 210);
ApplyFilter(filter);
rgbLinearFiltersItem.Checked = true;
}