What is an MEF file?
An MEF file is a RAW image format used by Pentax digital cameras. It stores unprocessed sensor data, preserving maximum detail, color depth, and dynamic range. MEF files are ideal for professional photo editing, allowing precise control over exposure, white balance, and colors without quality loss.
What is an MEF file used for?
MEF files are mainly used for:
Professional and enthusiast photography
High-quality image post-processing
Long-term photo archiving
Because they are RAW files, MEF images are not optimized for direct sharing.
How to open an MEF file?
MEF files can be opened with:
Adobe Photoshop
Adobe Lightroom
Pentax Digital Camera Utility
GIMP (with RAW support)
XnView MP
Is MEF different from JPG or PNG?
Yes.
MEF is a RAW format with full sensor data, while JPG and PNG are processed and compressed formats made for viewing and sharing.
File format details
Format type: RAW image
Compression: Unprocessed / minimal
Color depth: High (professional-grade)
Developed by: Pentax
Primary use: Photography & editing
