Raw cyan, magenta, yellow and black bytes bitmap image
File type: Bitmap image file
A cmyk file is a raw bitmap image containing cyan, magenta, yellow and black channel data. It is associated with ImageMagick.
The file contains pixel bytes rather than a complete image document with built-in metadata, so its dimensions and other reading parameters may be needed to interpret it correctly.
File type category:
Bitmap image file
Date updated: November 4, 2026
This raw CMYK bitmap format is used by ImageMagick, the open-source image-processing suite developed by ImageMagick Studio LLC. CMYK represents cyan, magenta, yellow and black color channels and is commonly used for digital printing.
A cmyk file stores the channel data as raw bytes. Unlike many standard bitmap formats, it does not provide enough information by itself to identify the image dimensions, so ImageMagick must be given the correct size and pixel-depth information when necessary.
ImageMagick supports this format on its multiplatform range of operating systems. The format is mainly useful as an intermediate or exchange format within image-processing workflows rather than as a self-describing format for general image distribution.
Open the file with ImageMagick tools. Because a raw cmyk file normally has no header, provide the image width, height and pixel depth if ImageMagick cannot determine them automatically.
The file can then be displayed or inspected after ImageMagick has been told how to interpret its CMYK pixel data.
ImageMagick can read a raw cmyk file and write the image to another bitmap format. The correct image dimensions and pixel depth must be known before conversion; otherwise the resulting image may be misaligned or distorted.
For printing workflows, the image can be exported to a format that preserves CMYK data. For ordinary screen use, it can instead be converted to an RGB-based format.
Programs for viewing cmyk files:
Multiplatform
Software apps that convert cmyk files:
Multiplatform
English
