Hello inkjunkie,
From the section on Canon Log image characteristics highlighted on the Canon USA web site for the EOS 5D Mark IV Canon Log function.
Canon Log helps record images for post-processing that feature a wide dynamic range. Captured 4K and Full HD video files feature suppressed contrast and sharpness and increased dynamic range of up to 800% or 12 stops (at ISO 400 or above).
This means more detail in the highlights, enhanced details in the shadows, and because of its balanced image quality – the flexibility to work with color saturation and tone to create a specific look, or to match other recorded media. A View Assist setting provides a preview on the LCD monitor of how an image may look with post-processing characteristics.
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