Dynapik offers a free online tool to change image types - no need to download anything. It's quick and easy to use. You can change your CUT images to AVIF format. This tool works for both professionals and casual users. Convert your images to AVIF in seconds.
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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.
AVIF (AV1 Image File Format)
The royalty-free successor to WebP, offering the world's best compression for the web.
AVIF is the cutting-edge image format derived from the AV1 video codec. Developed by the Alliance for Open Media (AOMedia)—a consortium including Google, Netflix, Amazon, and Microsoft—it was designed to be the ultimate royalty-free format for the web. AVIF offers significantly better compression than WebP, which was already better than JPEG. It supports features that WebP lacks, such as 10-bit and 12-bit color depth for HDR (High Dynamic Range) images, and it produces fewer compression artifacts at low bitrates. While encoding AVIF files takes longer than other formats, the bandwidth savings are substantial, often reducing file sizes by 50% compared to JPEG.
AVIF uses the HEIF (High Efficiency Image File Format) container structure but encodes the image data using the AV1 video codec. This allows it to use advanced video compression techniques like intra-frame prediction to squeeze image data down to incredibly small sizes. Unlike WebP, which is limited to 8-bit color, AVIF supports 10-bit and 12-bit color depths, making it the first viable web format for HDR photography. It also supports 4:2:0, 4:2:2, and 4:4:4 chroma subsampling, allowing for sharp text and graphics even with lossy compression.
The AV1 video codec was released in 2018 as a royalty-free alternative to HEVC (H.265). The AVIF image format specification followed in 2019. Adoption was rapid compared to previous formats. Chrome added support in 2020, followed by Firefox in 2021. Apple added support in iOS 16 and macOS Ventura (2022), completing the 'universal support' puzzle much faster than WebP did.
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