Learn to create a specialized view of your image that indicates how saturated each area is compared to its surroundings. Then determine exactly which color is lurking in the least colorful areas of your image and visualize the colors without the influence of brightness. These techniques will open a new world into how you can think about an analyze your images.
NOTE: Some Windows users have reported issues accessing the video playback controls. While we're working on the issue, here's a Temporary Workaround: Click "Introduction" in the table of contents to the right of the video and then immediately click within the video to give it focus. After doing so, use the spacebar to play/pause the video and the left/right arrow keys to scrub forward or backward within the video.
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