Which aspect of photography causes photos to be considered uncoded?

Photography and post-processing.

1. Shooting: During the shooting process, in order for the photos to be considered "uncoded", attention needs to be paid to reducing or avoiding any manual processing and post-processing. Keep the scene natural and real when shooting without using any special filters, post-processing or adding special effects.

2. Post-processing: Post-processing is the process of achieving the final effect of a photo. To have your photos viewed as "uncoded," avoid overly retouching or processing your photos. Keep the photo's authenticity and original look, making adjustments only to things like exposure, color, and contrast.