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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.
Picture Exchange
The de facto standard for DOS paint programs.
PCX (Picture Exchange) was one of the first widely accepted standards for DOS imaging. Created by ZSoft for their PC Paintbrush software, it became the native format for Windows 3.0 Paintbrush and supported the evolution of PC graphics hardware from monochrome CGA to 256-color VGA and eventually 24-bit TrueColor.
PCX uses a header containing the version, dimensions, and palette information, followed by image data compressed using a simple Run-Length Encoding (RLE) scheme. This scheme was very efficient for the simple graphics of the 80s (large areas of flat color) but is poor for complex photographs. 256-color palettes are often appended at the end of the file.
Established in 1985. It enjoyed a decade of dominance before being displaced by BMP (on Windows), GIF (on the web), and JPEG (for photos). It is now largely obsolete but still recognized by many tools due to its historical significance.
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