public LevelsDto GetLevelsValues()
{
LevelsDto dto = new LevelsDto();
float shadow = Helpers.ConvertRange(Shadow.Value, -400, 400, -1, 1);
float highlight = Helpers.ConvertRange(Highlight.Value, -400, 400, -1, 1);
float midtone;
if (Midtone.Value >= 0)
{
midtone = Helpers.ConvertRange(Midtone.Value, 0, 100, 1, 3);
}
else
{
midtone = Helpers.ConvertRange(Midtone.Value, -100, 0, 0.1f, 1);
}
dto.MinimumLevel = Shadow.Value >= 0 ? Math.Abs(shadow) : 0;
dto.Shadows = Shadow.Value <= 0 ? Math.Abs(shadow) : 0;
dto.MaximumLevel = Highlight.Value < 0 ? 1 - Math.Abs(highlight) : 1;
dto.Highlights = Highlight.Value > 0 ? 1 - Math.Abs(highlight) : 1;
dto.Midtones = midtone;
return dto;
}
private static Bitmap ApplyLevels(Bitmap bmp, LevelsDto dto)
{
bmp.ColorAdjustment.Levels(dto.MinimumLevel, dto.MaximumLevel, dto.Shadows, dto.Midtones, dto.Highlights, HistogramMode.Sum);
return bmp;
}
private static Bitmap AdjustChannelLevels(Bitmap bmp, Channel channel, LevelsDto dto)
{
var ch = bmp.Channels[channel];
ch = ApplyLevels(ch, dto);
bmp.Channels[channel] = ch;
return bmp;
}
