Info how to achieve some effects

[UkooLabs]

Thought id reach out as far as I know ImageSharp does not have the following effects...

1. Enhance Shadow, Warmth, Highlights
2. Auto Color (Brightness / Contrast)
3. Color Tint (Not same as hue)

Does anyone have any info on how these may be achieved using ImageSharp?

[tocsoft]

RE:Color Tint

Source image:

BlueViolet

using var bv = img.Clone(x => x
.SetGraphicsOptions(o => o.ColorBlendingMode = SixLabors.ImageSharp.PixelFormats.PixelColorBlendingMode.Multiply)
.Fill(Color.BlueViolet));
bv.Save("BlueViolet.jpg");

Red

using var bv = img.Clone(x => x
.SetGraphicsOptions(o => o.ColorBlendingMode = SixLabors.ImageSharp.PixelFormats.PixelColorBlendingMode.Multiply)
.Fill(Color.Red));
bv.Save("Red.jpg");

Salmon

using var bv = img.Clone(x => x
.SetGraphicsOptions(o => o.ColorBlendingMode = SixLabors.ImageSharp.PixelFormats.PixelColorBlendingMode.Multiply)
.Fill(Color.Salmon));
bv.Save("Salmon.jpg");

[UkooLabs]

Here is what i came up with that maybe useful for someone...

    private float Lerp(float from, float to, float step)
    {
        return from + (to - from) * step;
    }

    private Color InterpolateColor(Color from, Color to, int steps, int step)
    {
        var fromRgba = from.ToPixel<Rgba32>();
        var toRgba = to.ToPixel<Rgba32>();
        float percent = step / (float)steps;
        var intervalR = Lerp(fromRgba.R, toRgba.R, percent);
        var intervalG = Lerp(fromRgba.G, toRgba.G, percent);
        var intervalB = Lerp(fromRgba.B, toRgba.B, percent);
        var intervalA = Lerp(fromRgba.A, toRgba.A, percent);
        return Color.FromRgba((byte)intervalR, (byte)intervalG, (byte)intervalB, (byte)intervalA);
    }

    private static Color[] tintColors;
    public void TintImage(Image image, float amount, float opacity)
    {
        if (amount == 0)
        {
            return;
        }
        if (tintColors == null)
        {
            var primaryColors = new[] {
                Color.FromRgb(255, 0, 0),
                Color.FromRgb(255, 255, 0),
                Color.FromRgb(0, 255, 0),
                Color.FromRgb(0, 255, 255),
                Color.FromRgb(0, 0, 255),
                Color.FromRgb(255, 0, 255),
                Color.FromRgb(255, 0, 0)
            };
            tintColors = new Color[360];
            int index = 0;
            for (var x = 0; x < primaryColors.Length - 1; x++)
            {
                var firstColor = primaryColors[x];
                var secondColor = primaryColors[x + 1];
                for (var y = 0; y < 60; y++)
                {
                    tintColors[index++] = InterpolateColor(firstColor, secondColor, 60, y);
                }
            }
        }
        var tintValue = (int)Math.Min(Math.Max((amount * 180) + 180, 0), 359);
        var tintColor = tintColors[tintValue].WithAlpha(opacity);
        image.Mutate(x => x.SetGraphicsOptions(o => o.ColorBlendingMode = PixelColorBlendingMode.Multiply).Fill(tintColor));
    }

[UkooLabs]

Now i just need to work out how do to the auto color / contrast as above

[C10B]

Did you ever sort out auto contrast or auto brightness?