Free webp to jpg
EN
Image MIME Reference
Generic-RAW

Digital Camera Raw (Generic Linux MIME)

image/x-dcraw
VS

Khronos Texture

image/ktx
KTX

A complete technical comparison of Digital Camera Raw (Generic Linux MIME) and Khronos Texture — covering compression, feature support, browser compatibility, magic bytes, and when to choose each format.

Equal browser support

Feature Support

Feature Generic-RAW KTX
Transparency (Alpha) ✕ No Yes
Animation Support ✕ No ✕ No
Progressive Loading ✕ No ✕ No
HDR Support Yes Yes
EXIF Metadata Yes ✕ No
ICC Color Profile Yes ✕ No
Digital Camera Raw (Generic Linux MIME)
image/x-dcraw
Extension
.raw
Container Varies (Predominantly TIFF/EP)
Compression Lossless / Uncompressed
Algorithm
Varies (Often Lossless JPEG ITU-T81 or uncompressed)
Color Depth 12-bit, 14-bit, 16-bit
Developed by freedesktop.org (MIME mapping) / Dave Coffin (dcraw tool)
Released 1997
Magic Bytes
Varies by vendor format
Full Generic-RAW reference →
Khronos Texture
image/ktx
Extension
.ktx
Container KTX (Khronos Texture 1.1)
Compression Uncompressed / GPU Compressed (ASTC, ETC, BCn, PVRTC)
Algorithm
ASTCETC1 / ETC2BCn (DXT)PVRTCBasis Universal (in KTX2)
Color Depth 8-bit, 16-bit, 32-bit (Integer/Float)
Developed by Khronos Group
Released 2010
Magic Bytes
AB 4B 54 58 20 31 31 BB 0D 0A 1A 0A
Full KTX reference →

Browser Support Comparison

Browser Generic-RAW KTX
Chrome Chrome
✕ ✕
Firefox Firefox
✕ ✕
Safari Safari
✕ ✕
Edge Edge
✕ ✕
IE IE (Legacy)
✕ ✕
Generic-RAW

Generic-RAW Strengths

  • Provides a unified, highly useful catch-all MIME type for application developers who just need to know if a file is a raw image, rather than tracking 50+ individual camera extensions
  • Deeply integrated into the Linux desktop ecosystem, ensuring file manager thumbnails work seamlessly via tools like ufraw-thumbnailer
Limitations
  • Not an official IANA standard
  • Can cause conflicts where standard TIFF files are misidentified as raw camera data by over-aggressive MIME sniffers
  • The underlying 'dcraw' tool was abandoned by its creator in 2018 (though its successor, LibRaw, continues to maintain the ecosystem)
KTX

KTX Strengths

  • Enables direct-to-GPU texture uploading, drastically reducing load times and CPU overhead in 3D applications
  • Supports complex texture types natively (mipmaps, cubemaps, 3D volumes, texture arrays)
  • Standardized across major Khronos APIs (OpenGL, Vulkan, WebGL) unlike vendor-specific formats like DDS
Limitations
  • Requires custom JavaScript loaders to parse and display on the web
  • Zero native support in consumer image viewers or 2D photo editing software
  • Format fragmentation: a KTX file containing an ASTC payload will fail to render on hardware that only supports BCn compression (KTX2 and Basis Universal solve this)

When to choose which format

Generic-RAW
Use Generic-RAW when…
  • Linux Desktop File Associations (GNOME/KDE)
  • Thumbnail Generation for Raw Images (UFRaw/LibRaw)
  • Server-side Image Processing Fallbacks
KTX
Use KTX when…
  • Real-time 3D Graphics
  • WebGL / WebGPU Applications
  • Mobile Games
  • Virtual/Augmented Reality (VR/AR)

More comparisons

Generic-RAW vs ACES → KTX vs ACES → Generic-RAW vs APNG → KTX vs APNG → Generic-RAW vs AVCI → KTX vs AVCI → Generic-RAW vs AVCS → KTX vs AVCS → Generic-RAW vs AVIF → KTX vs AVIF → All comparisons →
Share this comparison