The public passport page is the part of DPTag your customers see, and the free plugin ships it in three palettes. The Pro add-on makes it yours: more palettes, a brand colour of your own, and your logo where the brand name stands. Everything happens on the same screen, Passports, then Passport page, and applies to every published passport at once.
Six more palettes
With the add-on active, the palette list grows from three to nine: Forest, Ocean, Plum, Ember, Olive and Midnight join Thread, Graphite and Clay. Pick one, save, and the page changes ink. As in the free plugin, a palette changes the colours only; the layout, the wording and the data are the same in every theme.
Your brand colour
Below the palettes, Your brand colour takes one colour, yours, and derives the whole page from it: the frame, the headings, the accents and the composition bar. One colour is enough because the derivation, not the colour, does the work. It keeps your hue and moves the lightness across a fixed span, so the light and dark tones the page needs are always there whatever colour you start from, a pale pastel or a deep navy alike.
The Pro palettes are made by that same derivation from one seed colour each. Your colour is treated exactly as well as ours, on purpose: a hand-tuned range next to a derived one would leave the merchant's own colour looking like the poor relation.
Do not use a brand colour returns to the palette selected above.
The composition bar stays readable
The composition bar is a chart, and a chart has to work without its colours: on a photocopy, on a monochrome print, for a colour-blind reader. The derivation keeps the bar's segments far enough apart in lightness to stay tellable, whatever your colour, and that was checked across the whole colour wheel at several saturations against the free plugin's own measure. There is no colour you can choose that makes the bar illegible.
Your logo
Logo chooses an image from your media library and shows it on the page in place of the brand name, at the same size. Your brand name stays as the image's description, so a customer whose connection drops the image, or who uses a screen reader, still gets the answer. Remove puts the name back.
A change of logo reaches every customer's browser at once: the page's cache check includes it, so no one keeps seeing the old one.
If the licence lapses
The nine palettes, the brand colour and the logo live in the add-on. When the licence lapses, the page falls back to the free plugin's default palette and to the brand name, and never breaks. Your choices are kept and come back with the licence.
The palettes of the free plugin, and how a theme relates to the bar, are on the public passport page.