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Dr. Halo CUT
A legacy device-independent bitmap format from the Dr. Halo paint program.
The CUT format is a legacy raster image format associated with Dr. Halo, a popular paint program for MS-DOS in the 1980s. It was designed to be a device-independent format for storing images. A unique characteristic of the CUT format is that it typically does not store its own color palette. Instead, the palette is stored in a separate file with the extension .PAL. Without this companion file, a CUT image is often rendered in grayscale.
A CUT file begins with a simple 6-byte header specifying the width and height. The image data follows immediately and is compressed using Run-Length Encoding (RLE) to save disk space, which was critical in the floppy disk era. Because the file only contains indices (0-255) for the pixels, it relies entirely on the external .PAL file to map those indices to actual Red, Green, and Blue colors.
Dr. Halo was one of the first serious competitors to PC Paintbrush (PCX). The CUT format was widely used in the DOS era for creating graphics, screenshots, and simple illustrations. As Windows became dominant and formats like BMP and GIF standardized color storage, CUT fell into obscurity.
BigTIFF
TIFF for files larger than 4GB.
BigTIFF (often referred to as TIFF64) is an extension of the classic TIFF format designed to break the 4GB file size barrier. It uses 64-bit offsets instead of 32-bit, allowing for files up to 18,000 petabytes.
Standard TIFF uses 32-bit integers for file offsets, limiting the file size to 2^32 bytes (4GB). BigTIFF changes the internal structure to use 64-bit integers. It is not backward compatible with older TIFF readers that only understand 32-bit offsets.
Developed to address the needs of geospatial and medical imaging, where single images often exceed 4GB. It is supported by LibTIFF starting from version 4.0.
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