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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.
Photoshop Document
The industry standard for digital image editing.
PSD (Photoshop Document) is the proprietary file format of Adobe Photoshop. It is the de facto standard in the digital art, photography, and graphic design industries. Unlike final output formats (JPG, PNG), a PSD is a working file that preserves the editor's state: independent layers, editable text, masks, blend modes, filters, and paths.
A PSD file is divided into five major parts: File Header, Color Mode Data, Image Resources (metadata like paths, guides), Layer and Mask Information (the bulk of the data), and Image Data (a flattened backward-compatible preview). This structure allows Photoshop to save complex non-destructive editing states.
Created by Thomas Knoll in 1988 for the original version of Photoshop. It has evolved with every version of the software, adding support for new features (vectors in v6, smart objects in CS2) while maintaining remarkable backward compatibility.
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