Open, read and create PNG images in fully managed C#.
To open a PNG image from file and get some pixel values:
using (var stream = File.OpenRead(@"C:\my\file\path\file.png"))
{
Png image = Png.Open(stream);
Pixel pixel = image.GetPixel(image.Width - 1, image.Height - 1);
int pixelRedAverage = 0;
pixelRedAverage += pixel.R;
pixel = image.GetPixel(0, 0);
pixelRedAverage += pixel.R;
Console.WriteLine(pixelRedAverage / 2.0);
}
The PNG object has methods to inspect the header and get the pixel values. The header has properties for:
png.Header.Width
png.Header.Height
png.Header.BitDepth
png.Header.ColorType
png.Header.CompressionMethod
png.Header.FilterMethod
png.Header.InterlaceMethod
The PNG also has width and height as convenience properties from the header information:
png.Width == png.Header.Width
png.Height == png.Header.Height
And a property that indicates if the image uses transparency:
png.HasAlphaChannel
To get a pixel use:
Pixel pixel = png.GetPixel(0, 7);
Where the first argument is x (column) and the second is y (row). The Pixel is used for all image types, e.g. Grayscale, Colour, with/without transparency.
To create a PNG use:
var builder = PngBuilder.Create(2, 2, false);
var red = new Pixel(255, 0, 0);
builder.SetPixel(red, 0, 0);
builder.SetPixel(255, 120, 16, 1, 1);
using (var memory = new MemoryStream())
{
builder.Save(memory);
return memory.ToArray();
}
You can also load a PNG into a builder which will copy all the pixel values into the builder for easy editing:
var png = Png.Open(@"C:\files\my.png");
var builder = PngBuilder.FromPng(png);
