Nail the exact color dark purple in your design by using the code from any one of these systems for color identification.
|RGB||r: 135, g: 31, b: 120|
|HSL||h: 309°, s: 63%, l: 33%|
|HSV||h: 309°, s: 77%, v: 53%|
|CMYK||c: 0%, m: 77%, y: 11%, k: 47%|
If you're identifying color for pretty much anything digital, you're working in an RGB colorspace. If the project you're working on requires percentage representation, dark purple is made of 53% red, 12% green, and 47% blue.
If you're identifying color for a print project, you're most likely using a CMYK colorspace—the percentages are 0% cyan, 77% magenta, 11% yellow, 47% black.