How can I determine if a file is an image file in .NET?

by

If you will only be supporting a handful of the popular image formats, then you can simply read the first few bytes of the file to determine the type based on the Magic Number

Examples from the link provided:

  • GIF image files have the ASCII code for “GIF89a” (47 49 46 38 39 61) or “GIF87a” (47 49 46 38 37 61)
  • JPEG image files begin with FF D8 and end with FF D9. JPEG/JFIF files contain the ASCII code for “JFIF” (4A 46 49 46) as a null terminated string.
  • PNG image files begin with an 8-byte signature which identifies the file as a PNG file and allows detection of common file transfer problems: \211 P N G \r \n \032 \n (89 50 4E 47 0D 0A 1A 0A).

More Related Contents:

  1. My images are blurry! Why isn’t WPF’s SnapsToDevicePixels working?
  2. Determine file type of an image
  3. Analyze colors of an Image
  4. User images – database vs. filesystem storage [duplicate]
  5. How to edit EXIF data in .NET [closed]
  6. How do I reliably get an image dimensions in .NET without loading the image?
  7. How do I bind a Byte array to an Image in WPF with a value converter?
  8. Html.Partial vs Html.RenderPartial & Html.Action vs Html.RenderAction
  9. Where Is Machine.Config?
  10. Should we switch to use async I/O by default?
  11. How to connect to Oracle 11 database from . net
  12. How can I get my webapp’s base URL in ASP.NET MVC?
  13. Any decent text diff/merge engine for .NET? [closed]
  14. Get Database Table Name from Entity Framework MetaData
  15. How do I set a ViewModel on a window in XAML using DataContext property?
  16. Change WPF DataTemplate for ListBox item if selected
  17. Can I set Option Explicit and Option Strict on a Project/Solution level?
  18. How to repair COMException error 80040154?
  19. How do I set a number of retry attempts in RabbitMQ?
  20. JavaScriptSerializer UTC DateTime issues
  21. How to troubleshoot and debug Visual Studio design mode errors?
  22. Use Visual Studio Setup Project to automatically register and GAC a COM Interop DLL
  23. Use a StyleSelector for a button
  24. Are there any better ways to copy a native dll to the bin folder?
  25. Determine if a generic param is a Nullable type
  26. How can I represent a very large integer in .NET?
  27. Get the name of Enum value
  28. “Register for COM Interop” vs “Make assembly COM visible”
  29. SQL Connection Error: System.Data.SqlClient.SqlException (0x80131904)
  30. InvalidOperationException: Unable to resolve service for type ‘Microsoft.AspNetCore.Http.IHttpContextAccessor’

Leave a Comment