Extract color palette of an Image
So you want to know the dominant colors of an image? extract them with :
gowall extract /path/to/img.png -c 6
The -c flag is the colors flag it specifies how many hex color codes to return ( i recommend 6-16).
The above will print the color codes to the terminal. In order for you to view all the colors of the hex codes at once you can use the -p flag.
gowall extract /path/to/img.png -pc 6
That will open a hex color previewer in your default web browser, simply copy the hex colors from the terminal over there.
tip
If your image consists of lets say 1 color (blue) and you try to extract more colors with gowall extract /path/to/img.png -c 3,
then it will return the 1 true color (blue) and produce another 2 shades of blue.
Examples​

➤ Batch conversion​
gowall extract --batch img1.png,img2.png -c 6
➤ Directory conversion​
gowall extract --batch img1.png,img2.png -c 6