Fig. 5.

The Technical Memorandum TM-30-18 chroma shift color vectors. Developed by the Illuminating Engineering Society. TM-30 evaluates color rendition, chroma, and gamut of the light sources using a set of 99 color evaluation samples. TM-30 is a reference-based system; here the reference color is set to D65. The chroma shift vectors illustrate both direction and magnitude of change from the reference. On the top row is a comparison of three white LED dermoscopes, and on the bottom row, three other light sources including halogen, xenon, and daylight are shown. Of note, the DL4 illustrates how some colors are rendered undersaturated, such as green, orange, and red, while blue appears oversaturated. TM-30 is analogous to CRI, but it uses more updated color science and represents human perception better. Note that halogen renders colors most similarly to D65.