雷晟 LTT

What is the difference between PPI and DPI? And, how and when to use them?

The PPI and DPI referred to here are two LTT drivers that provide functional parameters for laser cutting and engraving. "PPI" is the abbreviation of "Pulse Per Inch" (the number of laser points emitted per inch). "DPI" is the abbreviation of "Dot Per Inch" (the number of times per inch along the X-axis and the number of lines in the Y direction)

1. PPI: PPI is mainly used to determine the laser firing control method when cutting. The higher the PPI, the more frequent pulses (firing) will be, but the energy of each pulse will be relatively less, so the cutting effect will be different between different PPI values. For some sensitive materials, such as PET film kiss-cut applications, the PPI setting will be a good tool for fine-tuning power.

PPI parameters are located in the "laser" tab and can be adjusted through "color"

The value can be set from 1 to 1000 by dragging the bar, and the checkbox must be checked.

2. DPI: DPI can be found in the tag “Job” and the field “Resolution.” DPI refers to the information of the drawing resolution given by Windows GDI (Graphic Device Interface) and to mapping with LTT DPI settings to get a suitable raster resolution for engraving.

Users can find there are nine different DPI values in the drop-down menu.

One thing to be careful of is that, unlike laser printers, higher resolution means better image quality. For laser engraving machines, a higher resolution will impair the quality of the engraving results. Setting a higher DPI will cause the laser engraving operation to take more time and may cause excessive burning of the engraving work. The result of laser engraving is related to the material; therefore, the best way to find a suitable engraving DPI should try from a lower DPI value to see if the result is acceptable before making adjustments.