Revisiting Josef Albers’ Interaction of Color, this time chapter XIX, exercise XIX-1 (p.174 in the Yale 50th Anniversary Edition). Here’s an example of one of Albers’ students completing the exercise, colour-matching a Matisse painting using coloured paper.
This exercise is an acid test for my Colour Vision Deficiency. I know some of my matches will appear inaccurate to people with normal colour vision, so it’s a matter of learning about the degree of inaccuracy and what parts of the spectrum are most affected.
I used Photoshop to do these exercises, selecting my match colours in the Colour Picker window. The results seem to indicate that my colour vision is least accurate for colours in which only a small amount of a primary colour is present – for example, the small amount of red that makes the difference between blue and purple, or the small amount of colour in a pale colour like the background of Matisse’s Blue Nude II or the smallest square in Albers’ Homage to the Square: Wide Sight (both below).