What does d-log mode mean?

D-Log is a high dynamic range video material recording format. In short, this color mode provides more space for post-production color correction.

When shooting with cameras and video cameras, a high-performance sensor usually supports a dynamic range of more than 11 stops, and in 8-bit photos or videos, it is in line with the human eye. The perceived Gamma is processed and recorded in-camera, and usually only a dynamic range of about 8 stops can be obtained, and some information is compressed and lost during processing. (Recommended learning: PHP Video Tutorial)

For still photos, you can restore all highlight and shadow details through RAW shooting, but on most consumer models, video shooting is not supported. RAW recording. At this time, in order to record enough dynamic range to leave enough space for color correction in post-production, and at the same time restore the details of bright and dark parts in a high-contrast environment, it is necessary to shoot D-Log video. DJI’s latest models all have built-in D-Log mode.

Using D-Log shooting can greatly expand the dynamic range and color gamut of video recording. Because a larger dynamic range is compressed within 8 bits, the image will appear to have lower contrast on an ordinary display (that is, it will look grayer) and is not suitable for direct viewing by the human eye.

Therefore, after the shooting is completed, it needs to be post-processed by the colorist to restore the perception of the human eye. During the color grading process, you can also select the most interesting brightness range to retain.

Take DJI’s latest consumer drone Movic 2 Professional Edition, which uses a 10-bit Dlog-M color mode that can record up to 1 billion colors (traditional 8-bit Color coding can only record 16 million colors), while retaining more details in bright and dark parts, and also provides a lot of space for post-production color correction. In fact, this mode is similar to the D-log color mode of previous products, but it is more Optimized image color

It should be noted that D-Log mode retains as much tonal range as possible, giving users sufficient post-production space to facilitate users to apply various color or style filters.

However, there is no free lunch in the world. D-Log mode will compress video files, resulting in loss of image quality. Under high dynamic range, it is wise to sacrifice image quality and use D-Log. If the dynamic range is not high, it is better to choose D-Log carefully.

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