Which color looks more similar to the reference?

In a series of tasks, we are going to show you a reference color and two other colors. Your job is to decide which one of the two colors looks more similar to the reference (see the task interface below).

Complete each task as accurately and quickly as possible.
We will start with a short training session to get you familiarized with the task interface. Click the button below to continue with the training session.

GREAT! You are done with training.
Now, take a moment and look at the colors above. How similar are they? What are the most similar and different pairs?
When you are ready, click the button below to start the study. Thanks for helping!

reference

a b

Which is more similar to reference, a or b?

Your task is to select the color that looks more similar to the reference. You can make your selection by clicking on the color or by using the keyboard key. Complete each task as accurately and quickly as possible.

training session

a - select color a
b - select color b
enter or space bar - advance to next task

DONE! You have completed all the tasks. Now please tell us how you have compared the appearance of colors? Did you use any strategies? Enter your feedback in the box on the right.