Machine and output

LPI

Also known as lines per inch

Lines per inch, another way of expressing raster scan-line density.

By EngravePrep Editorial Team

In the workflow

Why LPI matters

Software may use LPI and DPI interchangeably in a scanning context even though printing terminology can distinguish them.

Practical check

How to evaluate it

Confirm how the destination software uses LPI before treating it as equivalent to image DPI. Translate the value into physical line spacing when comparing workflows.

Go deeper

Learn the DPI and line interval relationship, calculate output pixels, avoid overlapping scan lines, and preserve exact size in a photo workflow.

Read the complete guide

Prepare the pixels

Use the terminology in a real photo workflow.

Crop, tune, size, dither, and export a one-bit PNG on iPhone or iPad. Test the result on scrap with your machine and material guidance.

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