What color are the large stripes in the above picture? Most people (including myself) say blue and green with pink space in between.
Would you believe me if I told you that the “blue” and “green” stripes are the exact same color?
Bad Astronomy explains:
For pedantry sake, the RGB colors in both spirals are 0, 255, 150. So they are mostly green with a solid splash of blue.
The reason they look different colors is because our brain judges the color of an object by comparing it to surrounding colors. In this case, the stripes are not continuous as they appear at first glance. The orange stripes don’t go through the “blue” spiral, and the magenta ones don’t go through the “green” one.
On that same page you can see samples from each stripe taken independent of its surrounding and you will see that they are, in fact, the exact same hue.