What a function says a colour does, in each of its four kinds: a spectrum read off a table of values, a ramp cut into bands by a small calculation, an ink whose conversion recipe is a program printed under its swatches, and a table joined end to end between two ends.
A gradient, a spot ink, a correction curve: in each case one number goes in and several come out, and the file says how. There are four kinds of function in the format, and this page draws one panel for each, with the program printed under what it draws.
A spectrum read off a table of values, a stepped ramp worked out by a small program, an ink whose conversion recipe is a program of its own, and a table joined end to end between two ends. Anything else on this site that involves a gradient or a separated ink is built on one of these four.
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 same document is written in each of these languages. Open the one you want to look at.
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Not one mark on the page changed. See every document measured.
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.