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Printer test page reference guides
These pages explain what each kind of printer test chart actually measures, so you can read the sheet in front of you instead of guessing at it.
Reference guides
- Test patterns — Every mark on a printer test sheet exists to answer one specific question. Read the sheet in the wrong order and you will diagnose the wrong fault with complete confidence.
- DPI chart guide — A DPI chart does not print a number. It prints a set of lines that get closer together until they merge, and the point at which they stop being distinguishable is your result.
- Colour chart guide — A colour chart is a set of known values printed so you can compare them against what you expected. It measures lay-down and balance, not accuracy — accuracy needs a target you can measure against.
- Density guide — Density is how much ink lands on the paper. It is measured across a series of patches from empty to solid, and the shape of that series tells you whether coverage is healthy.
- Registration guide — Registration is whether the marks a printer makes land where they should. In colour work it means every ink is in the same place; in duplex it means both faces agree.
- Resolution vs DPI — Resolution and DPI are quoted as if they were the same number. They are not: one is what the engine can emit, the other is what survives the journey onto paper.
Set scaling to 100%. Choose Actual Size in the print dialog, never Fit to page — scaling distorts every measurement on this sheet. The Download PDF button hands you that same sheet as a ready-made file, so there is no scaling decision to get wrong.
Using these reference guides
- Pick the guide that matches the number or mark you are looking at.
- Read it once before printing so you know what you are hunting for.
- Follow the link to the printable chart it explains.
- Print at Best quality on the same paper you normally use.
- Read the sheet against the guide rather than from memory.
- Return to the guide when a result looks ambiguous — it usually is.
Reading the result
| You know what the chart is measuring | Read the guide first, then print. A number you cannot interpret is not a result. |
| Two guides seem to say the same thing | They do not — resolution, DPI and chart interpretation are three different questions. Pick the one matching what you actually want to know. |
| The guide mentions a printable page | That is the tool itself. Each guide links straight to the chart it explains, so the reading and the print sit side by side. |
| A result contradicts the guide | Reprint at the same size and quality before concluding anything. One sheet is a sample, two matching sheets are a result. |
| You want a diagnosis rather than an explanation | Move to the pattern pages themselves — those are the instruments; these are the instruction cards. |
Also check
- Resolution chart — The chart these guides keep referring to — print it before reading on, so every mark you read about is one you have actually seen.
- Gradient and banding page — The clearest example of a result that looks like a fault and usually is not: banding is a real defect but its threshold depends entirely on viewing distance.
- Alignment page — Registration has two parts, and this page is where both are measured rather than discussed.
Related test pages
- DPI Chart printer test page — Printers advertise one resolution and deliver another. This chart measures what you actually get.
- Colour printer test page — One sheet that exercises every colour channel at once: bars, a smooth gradient, a mixing grid and a type scale.
Frequently asked questions
Are these pages different from the printable test pages?
Yes. The printable pages are instruments: they render a pattern and hand it to your printer. These guides are the instruction cards. They tell you what a chart measures, how to read the marks it produces and which fault each mark points at, then link you straight to the tool.
Which guide should I read first?
Start with test patterns explained if you are new to this, then resolution versus DPI if you have ever wondered why a 1200 dpi printer does not look like 1200 dpi. Density and registration are follow-on reads once you have a sheet in hand.
Do I need to print anything to use a guide?
No, but you will get more out of it with a sheet in front of you. The guides are written to be read next to the print, because most of the judgement calls happen on paper rather than on screen.
Why are there two DPI-related guides?
Because there are two separate questions. The DPI chart guide explains how to read the printed chart; the resolution versus DPI page explains why the number on the box is not the number you get on paper. Reading both takes five minutes and removes most of the confusion.
Can I share these guides?
They are free to link to and share. If you are writing a help article, linking to the specific guide rather than the home page gives your reader the exact answer they came for.