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Hasselblad 3FR
The raw format for Hasselblad's legendary medium format cameras.
3FR is the proprietary raw image format used by Hasselblad cameras. It is designed to capture the immense amount of data produced by medium format sensors, which are significantly larger than full-frame sensors. 3FR files are compressed to save space on the memory card. When imported into Hasselblad's Phocus software (or other compatible editors), they are typically converted into the uncompressed FFF format for editing.
3FR files contain 16-bit sensor data. This high bit depth is crucial for medium format photography, which prioritizes color accuracy and tonal gradation above all else. The format is TIFF-based but heavily customized. It includes specific metadata for Hasselblad's lens corrections (DAC - Digital Auto Correction), which are essential for achieving the optical perfection the brand is known for.
Hasselblad introduced 3FR with their H-system digital backs. It remains the standard capture format for their H and X system cameras.
PNG-64 (64-bit RGBA)
The ultimate format for transparency precision in VFX and compositing.
PNG-64 is the heavyweight champion of the PNG family. It combines the 16-bit per channel color depth of PNG-48 with a 16-bit alpha channel. This provides 65,536 levels of transparency, compared to just 256 levels in a standard PNG-32. This format is almost exclusively used in high-end visual effects (VFX), 3D rendering, and professional compositing. When you are rendering a CGI character to place into a movie scene, you need the edges to blend perfectly with the background, even after heavy color grading. PNG-64's 16-bit alpha channel ensures that semi-transparent pixels (like motion blur or hair) retain enough data to be manipulated without becoming jagged or discolored.
A PNG-64 file contains four channels: Red, Green, Blue, and Alpha. Each is 16 bits deep (16 x 4 = 64 bits). The 16-bit alpha channel is the defining feature. In an 8-bit alpha channel (PNG-32), a very faint shadow might only have 3 or 4 levels of transparency steps, leading to visible banding when contrast is increased. In a 16-bit alpha channel, that same faint shadow has hundreds of steps, ensuring it remains smooth under any processing.
Like PNG-48, PNG-64 has been part of the standard since the beginning but was largely ignored by the web community due to file size. It found its niche in the 3D and video production industries as a more accessible alternative to formats like EXR or TIFF for storing intermediate render passes.
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