There is no way to set the allowed formats when reading an image. You can however disable formats by unregistering them:
When you do this you won't be able to read or write a
foreach (var formatInfo in MagickNET.SupportedFormats) { if (formatInfo.Format != MagickFormat.Jpeg && formatInfo.Format != MagickFormat.Tiff && formatInfo.Format != MagickFormat.Gif) formatInfo.Unregister(); }
.png file so I am not sure if this is what you want.