Convert Pixels per yard to Lines per millimetre

Convert Pixels per yard (px/yd) to Lines per millimetre (lp/mm) instantly and accurately.

Conversion Formula

lp/mm = px/yd × 0.001093613298

About Pixels per yard

The pixel per yard (px/yd) is an imperial resolution unit used in textile printing, wide-format graphics, and fabric digitising, where roll widths and run lengths are measured in yards. The yard is exactly 0.9144 m = 36 in (Weights and Measures Act 1963; NIST Handbook 44), giving 1 px/yd = 1/36 PPI ≈ 0.02778 PPI. Wide-format inkjet printers (Roland RE-640, Mimaki JFX200) resolve up to 1440 DPI = 51,840 px/yd. Fabric digital printers for dye-sublimation operate at 300-600 DPI ≈ 10,800-21,600 px/yd. Flag and banner printing standard for photographic quality at 1 m viewing distance is ≈ 720 px/yd. 1 px/yd = 1/36 PPI ≈ 0.027778 PPI ≈ 1.111 px/m.

About Lines per millimetre

The line pair per millimetre (lp/mm) is the fundamental unit of spatial resolution in classical optics, characterising the resolving power of a lens, film emulsion, sensor, or microscope objective. A resolving power of N lp/mm means adjacent line pairs separated by 1/(2N) mm can be distinguished - derived from the Abbe diffraction limit (Ernst Abbe, 1873) and Rayleigh criterion (Lord Rayleigh, 1879). Film benchmarks at MTF50: Kodak Tri-X 400: 63 lp/mm; Fujifilm Velvia 50: 160 lp/mm; Kodak Technical Pan: 320 lp/mm. Lens benchmarks: Leica APO-Summicron-M 50 mm f/2 ASPH: ≈ 75 lp/mm at centre. CMOS sensor Nyquist frequency: for pixel pitch p mm, f_Nyquist = 1/(2p) lp/mm - a 4.63 µm pixel limits at ≈ 108 lp/mm. As a dimensional unit, 1 lp/mm = 25.4 LPI = 25.4 PPI exactly. 1 lp/mm = 25.4 PPI.

Quick Reference Table

→ Full Image Resolution Converter