The ICC profile the library embeds in a PDF/A file.
Not a page: a colour profile. Every file meant for archiving has to carry a profile describing the device its colours are meant for, and this is the one the library builds when none is supplied. It is offered here as a file of its own so it can be inspected.
The library's own tests can only say one thing: the file looks right to whoever has just written it. Whether it really is an ICC profile — and whether that profile is really sRGB rather than something wearing its name — is a question for specialist software, and this file is what gets handed to it.
The same document is written twice, once in each language. Both files are shown in full, with the code coloured on the server, and can be copied in one click.
The document this example writes, ready to open.
This sample is a colour profile, not a page. Download it to inspect it.
Swatches in each of the three ways to say a colour — a grey as one number, a screen colour as three, a printing colour as four inks — each captioned with the instruction actually written into the file, and one mid-grey said three ways.
The same six colours said as bare numbers and then read through the sRGB profile the file carries, plus a ramp from light to dark and a sweep of hues in CIE L*a*b*: colour that still means the same thing on another screen and on a press.
Two inks the press carries on a plate of their own, each at ten strengths, a piece of work set in both, and the crosses used to line the plates up — drawn in an ink every plate answers to.
Eight choices of plate among the four usual inks, each with the small program that shows it printed underneath, and two inks the press carries itself used together, every strength of one against every strength of the other.
A chart of house colours the file carries, and a drawing whose sixteen numbers are places in that chart rather than colours. The same drawing is shown twice through two charts: repainting a whole brand is one table, not every drawing.
One pattern that states no colour of its own, laid down in five colours and in five strengths of one press ink: the fill says what colour to lay it down in. Beside them, the same hatch made of patterns that carry their own colours, which is one pattern per colour.