Question

我有一个大文件（6GB），它使用libtiff 4.0.3显示以下信息：

> tiffinfo MyPic
MyPic: Warning, Nonstandard tile length 1, convert file.
TIFFReadDirectory: Warning, Unknown field with tag 65100 (0xfe4c) encountered.
TIFFReadDirectory: Warning, Unknown field with tag 65102 (0xfe4e) encountered.
TIFFReadDirectory: Warning, Unknown field with tag 65103 (0xfe4f) encountered.
TIFFReadDirectory: Warning, Unknown field with tag 65109 (0xfe55) encountered.
TIFF Directory at offset 0x1816881c8 (6466077128)
  Subfile Type: (0 = 0x0)
  Image Width: 20064 Image Length: 306083
  Tile Width: 912 Tile Length: 1
  Resolution: 1, 1 (unitless)
  Bits/Sample: 16
  Sample Format: unsigned integer
  Compression Scheme: 65100 (0xfe4c)
  Photometric Interpretation: min-is-black
  Orientation: row 0 top, col 0 lhs
  Samples/Pixel: 1
  Planar Configuration: single image plane
  Make: ##############
  DateTime: 2013:08:09 08:12:45
  CameraSerialNumber: ###############
  Tag 65100: 1094996812
  Tag 65102: 3
  Tag 65103: 4
  Tag 65109: 1441792

如您所见，我正在检查的文件包含特定标记（0xfe4c，0xfe4e，0xfe4f，0xfe55）和压缩方案（0xfe4c），这些标记是“不寻常的”。

在检查了一些网站后，我发现EXIF元数据标签0xfe4c，0xfe4e，0xfe4f，0xfe55是Adobe Photoshop的Camera Raw插件标签[source]。

现在，假设压缩方案0xfe4c与Adobe程序有关，可能太秃了，但是，如果是这样的话，我用“Adobe”标记它。

我无法提供图像（因为它本身由外部公司提供，重量为6 GB），但可以在其上运行libtiff命令。问题是libtiff 4.0.3不支持压缩方案0xfe4c：

> ./tiff2pdf -o /tmp/output.pdf MyPic
MyPic: Warning, Nonstandard tile length 1, convert file.
TIFFReadDirectory: Warning, Unknown field with tag 65100 (0xfe4c) encountered.
TIFFReadDirectory: Warning, Unknown field with tag 65102 (0xfe4e) encountered.
TIFFReadDirectory: Warning, Unknown field with tag 65103 (0xfe4f) encountered.
TIFFReadDirectory: Warning, Unknown field with tag 65109 (0xfe55) encountered.
MyPic: Warning, Nonstandard tile length 1, convert file.
TIFFReadDirectory: Warning, Unknown field with tag 65100 (0xfe4c) encountered.
TIFFReadDirectory: Warning, Unknown field with tag 65102 (0xfe4e) encountered.
TIFFReadDirectory: Warning, Unknown field with tag 65103 (0xfe4f) encountered.
TIFFReadDirectory: Warning, Unknown field with tag 65109 (0xfe55) encountered.
MyPic: Warning, Nonstandard tile length 1, convert file.
TIFFReadDirectory: Warning, Unknown field with tag 65100 (0xfe4c) encountered.
TIFFReadDirectory: Warning, Unknown field with tag 65102 (0xfe4e) encountered.
TIFFReadDirectory: Warning, Unknown field with tag 65103 (0xfe4f) encountered.
TIFFReadDirectory: Warning, Unknown field with tag 65109 (0xfe55) encountered.
MyPic: Warning, Nonstandard tile length 1, convert file.
TIFFReadDirectory: Warning, Unknown field with tag 65100 (0xfe4c) encountered.
TIFFReadDirectory: Warning, Unknown field with tag 65102 (0xfe4e) encountered.
TIFFReadDirectory: Warning, Unknown field with tag 65103 (0xfe4f) encountered.
TIFFReadDirectory: Warning, Unknown field with tag 65109 (0xfe55) encountered.
tiff2pdf: No support for MyPic with compression type 65100:  not configured.
tiff2pdf: An error occurred creating output PDF file.

有没有人遇到过这种压缩方案？我不知道它是否是一种新的压缩算法（在这种情况下，我要么必须对代码进行反向工程，要么要求？Adobe？寻求支持），或者它是否是现有算法的新密钥（在在哪种情况下，更新我的lib会非常简单。）

谢谢，帕斯卡

压缩方案65100（0xfe4c）的Tiff文件

0 个答案: