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Negative (Invert Colors):

What it does

The Negative filter inverts every pixel’s color by subtracting each RGB component from 255, producing a photographic “negative” effect. Bright areas become dark, and cool tones swap to warm tones.

Preview

Negative Filter Preview
Negative Filter Preview

Usage in Code

Negative.cs
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private Bitmap ApplyNegativeFilter(Bitmap sourceImage)
{
    int width  = sourceImage.Width;
    int height = sourceImage.Height;
    Bitmap newImage = new Bitmap(width, height);

    for (int x = 0; x < width; x++)
    {
        for (int y = 0; y < height; y++)
        {
            Color px = sourceImage.GetPixel(x, y);
            // Invert each channel
            int r = 255 - px.R;
            int g = 255 - px.G;
            int b = 255 - px.B;

            Color inverted = Color.FromArgb(px.A, r, g, b);
            newImage.SetPixel(x, y, inverted);
        }
    }

    return newImage;
}

Negative (photography)

In photography, a negative is an image, usually on a strip or sheet of transparent plastic film, in which the lightest areas of the photographed subject appear darkest and the darkest areas appear lightest. Wiki

Created: 2025-06-28
Updated: 2025-06-28