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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.
PNG-64 (64-bit RGBA)
The ultimate format for transparency precision in VFX and compositing.
PNG-64 is the heavyweight champion of the PNG family. It combines the 16-bit per channel color depth of PNG-48 with a 16-bit alpha channel. This provides 65,536 levels of transparency, compared to just 256 levels in a standard PNG-32. This format is almost exclusively used in high-end visual effects (VFX), 3D rendering, and professional compositing. When you are rendering a CGI character to place into a movie scene, you need the edges to blend perfectly with the background, even after heavy color grading. PNG-64's 16-bit alpha channel ensures that semi-transparent pixels (like motion blur or hair) retain enough data to be manipulated without becoming jagged or discolored.
A PNG-64 file contains four channels: Red, Green, Blue, and Alpha. Each is 16 bits deep (16 x 4 = 64 bits). The 16-bit alpha channel is the defining feature. In an 8-bit alpha channel (PNG-32), a very faint shadow might only have 3 or 4 levels of transparency steps, leading to visible banding when contrast is increased. In a 16-bit alpha channel, that same faint shadow has hundreds of steps, ensuring it remains smooth under any processing.
Like PNG-48, PNG-64 has been part of the standard since the beginning but was largely ignored by the web community due to file size. It found its niche in the 3D and video production industries as a more accessible alternative to formats like EXR or TIFF for storing intermediate render passes.
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