//public delegate int rgbaoGreyscale(Color color, bool invert);
public static Img ReadAndGreyscale(Byte[] file, double compressRatio, bool invert)
{
var img = Image.Load(file);
int width = img.Width;
int height = img.Height;
//Console.WriteLine($"image w = {width} h = {height}");
if (compressRatio != 1)
{
width = Convert.ToInt32(width * compressRatio);
height = Convert.ToInt32(height * compressRatio);
}
Img res = new Img(width,
height);
//img.Mutate(i => i.Contrast(0.5f));
if (invert)
{
img.Mutate(i => i.Invert());
}
if (compressRatio != 1)
{
img.Mutate(i =>
i.Resize(new Size(width, height)));
}
img.Mutate(i => i.GaussianSharpen());
img.Mutate(i => i.Dither());
img.Mutate(i => i.Contrast(0.7f));
img.Mutate(i => i.Grayscale());
for (int i = 0; i < height; i++)
{
for (int j = 0; j < width; j++)
{
//Console.WriteLine($"i = {i} j = {j} res w/h = {res.Width}/{res.Height} size = {res.Width * res.Height}");
res[j, i] = Convert.ToByte(img[j, i].R);
}
}
img.Dispose();
return(res);
}
public static string GrayscaleToAscii(Img img)
{
var str = "$@B%8&WM#*oahkbdpqwmZO0QLCJUYXzcvunxrjft/\\|()1{}[]?-_+~<>i!lI;:,\"^`'. ";
var sb = new StringBuilder(img.Width * img.Height + img.Height);
for (var i = 0; i < img.Height; i++)
{
for (var j = 0; j < img.Width; j++)
{
sb.Append(str[Convert.ToInt32(Math.Round((double)(img[j, i] / str.Length)))]);
}
sb.Append("\n");
}
return(sb.ToString());
}
