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To identify a colour that best represents an image, we need to understand that colour can be numerically represented in many , many ways (https://en.wikipedia.org/wiki/Color_model ), called colour models. When an image, stored as a jpg or png or other file format, is loaded into a computer, the colour of each pixel can be numerically represented by passing saved information to any of these colour models.

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  1. Taking the depth registered row image (see Preprocessing Analytics Ready Data (Image Preparation + Depth Registration) for more information).

  2. Extract every pixel from the image, and plot each RGB triplet onto a 3 axis plot.

  3. Cluster all the RGB values into five clusters.

  4. Determine the cluster with the highest number of pixels. This is the dominant cluster.

  5. Find the geometric centre of the dominant cluster. The R, G and B values of this point is our Dominant Colour.

  6. Convert the RGB value to hex and export both .

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File Header

Description

hole_id

Customer’s Hole ID

depth_from_m

Start of interval (metres)

depth_to_m

End of interval (metres)

R

Red component of the dominant colour

G

Green component of the dominant colour

B

Blue component of the dominant colour

hex

Hex colour code for the dominant colour

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Version

Date

Author

Rationale

1

6 Dec 2023

S Johnson

Initial release

2

29 Jan 2023

S Johnson

Updated units for outputs