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Image MIME Reference
APNG

Animated Portable Network Graphics

image/vnd.mozilla.apng
VS

Minolta Raw Image

image/x-minolta-mrw
Minolta-MRW

A complete technical comparison of Animated Portable Network Graphics and Minolta Raw Image — covering compression, feature support, browser compatibility, magic bytes, and when to choose each format.

APNG wins on browser support

Feature Support

Feature APNG Minolta-MRW
Transparency (Alpha) Yes ✕ No
Animation Support Yes ✕ No
Progressive Loading Yes ✕ No
HDR Support ✕ No Yes
EXIF Metadata Yes Yes
ICC Color Profile Yes Yes
Animated Portable Network Graphics
image/vnd.mozilla.apng
Extension
.apng.png
Container PNG Chunk Stream
Compression Deflate (Lossless)
Algorithm
Deflate (zlib)
Color Depth 8-bit (Indexed), 24-bit (TrueColor), 32-bit (RGBA)
Developed by Mozilla Corporation (Stuart Parmenter & Vladimir Vukićević)
Released 2004
Magic Bytes
89 50 4E 47 0D 0A 1A 0A
Full APNG reference →
Minolta Raw Image
image/x-minolta-mrw
Extension
.mrw
Container Proprietary MRW Container
Compression Uncompressed / Proprietary Lossless
Algorithm
NoneProprietary Lossless
Color Depth 12-bit (Per Channel)
Developed by Minolta (later Konica Minolta)
Released 2001
Magic Bytes
00 4D 52 4D
Full Minolta-MRW reference →

Browser Support Comparison

Browser APNG Minolta-MRW
Chrome Chrome
✓ 59
 ✕
Firefox Firefox
✓ 3
 ✕
Safari Safari
✓ 8
 ✕
Edge Edge
✓ 79
 ✕
IE IE (Legacy)
✕ ✕
APNG

APNG Strengths

  • Supports 8-bit alpha transparency, completely solving the ugly 'white halo' problem inherent to GIFs
  • Gracefully degrades; viewers that do not support APNG will render a perfectly valid, static PNG of the first frame
  • Provides lossless compression that retains absolute pixel-perfect quality for UI elements and line art
Limitations
  • Because it relies on lossless Deflate compression, file sizes for complex, video-like animations can be massive compared to lossy formats like WebP or AVIF
  • Was initially rejected by the official PNG group, delaying its adoption for nearly a decade
  • Lacks native hardware decoding acceleration, unlike video-based animated formats (like MP4 or WebM)
Minolta-MRW

Minolta-MRW Strengths

  • Retains full, unadulterated sensor data from early CCD digital cameras, allowing modern demosaicing algorithms to extract far superior image quality than what was possible when the cameras were released
  • Possesses a very distinct, unambiguous magic header (\x00MRM), making programmatic identification completely foolproof
Limitations
  • Completely obsolete proprietary format that has not seen a new camera release since 2006
  • Cannot be natively viewed in web browsers or standard operating system image viewers without specialized decoders
  • Relies entirely on open-source reverse engineering (like LibRaw) for continued modern software compatibility

When to choose which format

APNG
Use APNG when…
  • High-Quality Web Animations
  • Stickers (Apple iMessage, LINE, Discord)
  • UI Loaders with Alpha Transparency
  • GIF Replacement
Minolta-MRW
Use Minolta-MRW when…
  • Vintage Digital Photography (Konica Minolta DiMAGE / Maxxum)
  • Raw Imaging Archival
  • Historical Camera Sensor Research

More comparisons

APNG vs ACES → Minolta-MRW vs ACES → APNG vs AVCI → Minolta-MRW vs AVCI → APNG vs AVCS → Minolta-MRW vs AVCS → APNG vs AVIF → Minolta-MRW vs AVIF → All comparisons →
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