Riso Barycentric Color Atlas is an formal exploration of color mixing on the risograph. Twenty-four sets of three colors have been printed in six figures, each with a constant total ink coverage ranging from 50% to 200%.
The percentages for each triangular swatch within each figure were chosen using barycentric coordinates. A barycentric coordinate system translate points in the interior of a triangle to three-component mixtures. This system means that swatches of the same intensity are located next to each other.
The book also includes a table showing the percentages for each swatch, a gray ramp for calibration, and a die-cut swatch viewer for isolating individual swatches.
Each spread is about 6.5 × 36". The images here don't do the colors justice, especially all of the pages with Fluorescent Pink and Fluorescent Orange.
A full PDF of the book is available here.
Click here to purchase a copy. Purchase comes with a digital download of the figures to make your own tests.
I am currently working on an expanded "deluxe" edition of the book which will include pages with all of the preliminary color tests, and an 3D printed version of the truncated cube from the title page.
