What color format is pdf-lib using?

Question

What color format is pdf-lib using? Writing rgb(156, 132, 678) or cmyk(157, 145, 124, 135) throws an error where all number values must be between 0 and 1.

How do I convert standard rgb, ie. 0-255 to whatever format this is?

The docs give me the TypeScript definitions of the function but no explanations.

standard RGB is not from 0 to 255 (or 256). Max value of 100 or 1 is common (especially in literature), and we should go back to such normalizations because we may have more bits per channel. In fact some new function start using again RGB which is white (see CSS) — Giacomo Catenazzi, Nov 05 '21 at 06:12
@GiacomoCatenazzi It's standard in web apis, and this is a javascript library — conor909, Nov 08 '21 at 17:38

score 7 · Accepted Answer · answered Nov 04 '21 at 15:15

7

Documentation gives an example like this color: rgb(0.95, 0.1, 0.1). Dividing by 255 is likely the solution.

answered Nov 04 '21 at 15:15

August Guenther

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see also https://stackoverflow.com/questions/10848990/rgb-values-to-0-to-1-scale – dougwoodrow Nov 04 '21 at 16:41

What color format is pdf-lib using?

1 Answers1