Question

How to identify black/dark image in C#. Is there any API to check the image visibility or darkness ratio? In my application, while copying images, I want to check each image and want to discard black images.

Any Idea how to achieve this?

Answer 1

An idea to get the image darkness/brightness can be:

Bitmap bitmap = // the bitmap
var colors = new List<Color>();
for (int x = 0; x < bitmap.Size.Width; x++)
{
    for (int y = 0; y < bitmap.Size.Height; y++)
    {
        colors.Add(bitmap.GetPixel(x, y));
    }
}

float imageBrightness = colors.Average(color => color.GetBrightness());

Maybe consider dark images as ones with brightness less than 0.1 (or any other value relevant)