Resolution, print quality and preparing artwork

Work out how large an image can be printed, clean it up sympathetically, and choose artwork that suits the room.

Time: 1–3 hours per image
Level: Intermediate

You'll need

Highest-resolution file available
Image editor (free options include GIMP or Photopea)
Printer's file specifications

01How big can it print?

Print size depends on the pixel dimensions of the file. Divide pixels by the print resolution to get inches.

Use	Typical resolution	Example: 6000 × 4500 px file
Framed print viewed close up	300 pixels per inch	20 × 15 in
Large print viewed from a few feet	150 ppi	40 × 30 in
Wallpaper or murals viewed from across a room	often 100–150 ppi at full size; ask your printer	40–60 in wide

TipUpscaling a small file adds pixels but not real detail. Always start from the largest original the institution offers.

02Prepare the file

1.Download the largest TIFF or JPEG available and keep an untouched copy.
2.Crop to the proportions of your frame or wall, leaving a margin if the printer asks for bleed.
3.Remove obvious dust spots and scanning marks. Keep the paper tone and age unless you want a modern look.
4.Adjust brightness and contrast gently; check against the original on screen.
5.Export in the format, size and color profile your printer requests, and order a small proof before printing large.

03Choosing artwork that suits the room

—Pull two or three colors from the room's wallpaper or textiles and look for prints that share them. The Color Palette Creator can extract them from a photo.
—Contrast scale: pair a busy wallpaper with simple, well-matted prints, or a plain wall with a bold botanical.
—Match the period loosely, not exactly — a Victorian engraving can sit well with a mid-century chair.

General guidance for beginners. Always follow the manufacturer's instructions for products you use, and ask a qualified professional where safety is a concern.