public byte[] SaveBytes(ImageFormat format)
{
// TODO: for Windows you can save a stream. Need to look into Cairo, but this may be the only way for OSX.
string seed = IdGenerator.GetRandomSeed();
string file = System.IO.Path.Combine(System.IO.Path.GetTempPath(), "crayon-" + IdGenerator.Generate32HexDigits(seed, "image") + FormatToExtension(format));
this.Save(file);
byte[] bytes = System.IO.File.ReadAllBytes(file);
System.IO.File.Delete(file);
return(bytes);
}