This is a .NET library for reading TIFF files. It is based on the TIFF 6.0 specification and supports all the compression types and color spaces defined in the specification.
- Load a TIFF object from a stream. The TIFF object contains the header and the IFD.
- Get necessary information from the TIFF header/IFD/de.
- Get the image data from a stream/memory mapped file.
- Get the image data from a remote stream.
using var reader = new BinaryReader(stream);
var tiff = TIFF.Load(stream); // cache this object
var memoryMappedFile = MemoryMappedFile.CreateFromFile("path", FileMode.Open, null, 0L, MemoryMappedFileAccess.Read)
using var viewAccessor = memoryMappedFile.CreateViewAccessor(0, 0, MemoryMappedFileAccess.Read);
var byteAccessor = new MemoryMappedViewByteAccessor(accessor);
// var bytes = await tiff.GetBytesAsync(byteAccessor, 0, 0, 0);
var imageBytes = await tiff.GetTileAsync(byteAccessor, 0, 0, 0); // RGB int[]
var handle = GCHandle.Alloc(data, GCHandleType.Pinned);
// save image via SkiaSharp
try
{
using var skiaImage =
SKImage.FromPixels(
new SKImageInfo(512, 512, SKColorType.Rgba8888, SKAlphaType.Premul),
handle.AddrOfPinnedObject());
using var bitmap = SKBitmap.FromImage(skiaImage);
using var imageStream = new MemoryStream();
bitmap.Encode(imageStream, SKEncodedImageFormat.Png, 100);
File.WriteAllBytes("image_path", imageStream.ToArray());
}
finally
{
handle.Free();
}using System.Net.Http;
using System.Net.Http.Headers;
using System.Threading.Tasks;
namespace TagImageFileFormat;
public class HttpRangeByteAccessor(string url) : IByteAccessor
{
private static readonly HttpClient HttpClient = new();
public async Task<byte[]> ReadBytes(long offset, int length)
{
var request = new HttpRequestMessage(HttpMethod.Get, url);
request.Headers.Range = new RangeHeaderValue(offset, length);
var response = await HttpClient.SendAsync(request);
var bytes = await response.Content.ReadAsByteArrayAsync();
return bytes;
}
}