In the workflow
Why Negative image matters
It helps produce a visually positive result on surfaces where laser exposure creates a lighter mark, such as many slate processes.
Practical check
How to evaluate it
Check the intended viewing result rather than the screen alone. A negative signal is useful only when the material response reverses it into the desired visible tones.
Go deeper
How to Prepare a Photo for Slate Laser Engraving
A careful photo-preparation workflow for slate, including polarity, contrast, dithering, sizing, and a controlled material test.
Read the complete guide