|  | @@ -50,12 +50,13 @@ namespace Emby.Drawing.Common
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				|  |  |          /// <exception cref="ArgumentException">The image was of an unrecognised format.</exception>
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				|  |  |          public static ImageSize GetDimensions(string path, ILogger logger, IFileSystem fileSystem)
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				|  |  |          {
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				|  |  | -            var extension = Path.GetExtension(path);
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				|  |  | -
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				|  |  | -            if (string.IsNullOrEmpty(extension))
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				|  |  | +            if (string.IsNullOrEmpty(path))
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				|  |  |              {
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				|  |  | -                throw new ArgumentException("ImageHeader doesn't support image file");
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				|  |  | +                throw new ArgumentNullException(nameof(path));
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				|  |  |              }
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				|  |  | +
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				|  |  | +            string extension = Path.GetExtension(path).ToLower();
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				|  |  | +
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				|  |  |              if (!SupportedExtensions.Contains(extension))
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				|  |  |              {
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				|  |  |                  throw new ArgumentException("ImageHeader doesn't support " + extension);
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