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Northern
Eclipse Help Reference |
Tagged Image File Format (*.tif) |
This file format supports 1-bit to 64-bit pixel images (1-16 bits per channel and 1-4 channels per image) and floating point images (IEEE 32 or 64-bit data). It also supports multiple images per file. It is a flexible and extendable format that is made up of required and optional tags. Each tag holds information about how the image(s) are organized (planar or interleaved), where they are located (1 or more blocks), how to interpret the image data, and where the auxiliary data is stored (thumbnails, annotations, legal stuff, capture conditions, conditions).
Since it is a very flexible format it creates the problem of one piece of software extending its format in such a way as to make another piece of software unable to load it correctly. Also, there have been a number of versions of the standard and software conforming to an earlier version may not understand a newer file. Finally, for many reasons there have been many non-compliant implementations of the TIFF specification created so compatibility problems are the biggest weakness of this file format.
This is the default image format used by Northern Eclipse. Eclipse conforms to the base standard of the TIFF 6.0 specification. It also supports some enhanced features such as annotations. It does NOT support optional color models (YCbCr, XYZ, XYy, or other models). It does NOT support compression. If an image has an “alpha” channel (per pixel transparency/opacity) it is ignored. It has also been written with enhanced support for non-compliant or “broken” TIFF files.
Supported Modes:
Floating Point grayscale
48-bit color
24-bit color
16-bit grayscale
8-bit grayscale
8-bit palette
8-bit palette
4-bit palette
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