How to Prep a Photo for Laser Engraving (And Why Most People Get It Wrong)

Photo engravings on wood either look stunning or look like dull, muddy mess. It's not actually the laser itself - it's the prep work you do on the photo before you send it to be laser engraved.

laser business,laser engrave,laser engraving,laser engraver,xtool,xtool P2,p2s,

Most bad engravings are directly related to the image that was sent to the laser. If the photo is low contrast, has a messy background, or is the wrong file format, no power or speed settings will fix it. Here's how to fix photos before engraving.

Pick the right photo first

First off just know that not every photo is a good engraving candidate. You want to look for one that has a clear, well-lit face or subject and a strong contrast between the subject and the background. A simple or naturally blurred background works really well.

This portrait of my daughter has soft natural light and a background that's out of focus.

The other thing you want to look for is a close up photo. Full-body shots tend not to work very well because the face ends up tiny relative to the engrave area and loses all detail.

Start with the highest resolution version of the photo you have. You want at least 300 DPI at your final engraving size.

The file format matters more than you think

For engraving photos, use a JPEG or a PNG. One of the most common mistake people make is tracing a photo to generate an SVG in hopes of getting cleaner lines. The problem is that strips all the tonal gradation out of the image and leave you with flat areas of black and white - which is the opposite of what you want.

JPEG or PNG files preserves all the mid-tones, the subtle gradations in skin and hair, and the lighting variations that translate beautifully to wood.

The step-by-step photo prep in xTool Creative Space

Once you've imported your image into xTool Creative Space (aka xTool Studio) you'll want to do the following steps in this order:

Start by cropping. Tighten the framing so your subject fills the majority of the engrave area. You don't want wasted background that just burns wood without adding anything.

Access the photo editor by selecting the photo and the clicking "Adjust" tool along the top tool bar. Do these in order:

From the photo editor options, start by bumping up the sharpness. A small increase is all you need (I did 12). You're not trying to make it look sharp on screen; you're trying to preserve edge detail when the laser engraves.

Adjust contrast. This is the single most important setting, and it's the one most people under-use because they're afraid of the preview.

You need to push contrast dramatically. The photo is NOT going to look good on the screen in full color, but a contrast of 45 or 50 is a good starting point for most portrait photos. Keep in mind that wood reduces the range when engraving so what looks too contrast-y on your screen will look great when engraved. Under-contrasting is the #1 cause of muddy engraving that lack detail.

Brightness usually doesn't need much change if your photo is already well lit - you don't want to wash out the image. Leave it at zero or give it a small lift if the photo is very dark overall.

Finally, convert to grayscale. Grayscale removes color information, so you want to do all of the other tonal adjustments first while the image is still in full color. Once you toggle on grayscale, you'll get an idea of what the laser is going to see. If anything looks dull at this point, toggle grayscale off and increase the contrast more.

What happens after photo prep

Good photo prep is just half the battle. The other half is your laser settings including power, speed, bitmap mode, lines per centimeter, and whether to run uni-directional or bi-directional. The right settings depend on your specific laser and the wood you're using.

What I can tell you for sure is that the default settings are usually too conservative to produce a good photo engraving. You'll need to make adjustments to increase the power and lower the speed.

The full laser engraving workflow video on Silhouette U walks through the exact power, speed, and bitmap mode settings that worked on 3mm basswood plywood with an xTool P2 - including why xTool's recommended settings produced a barely-visible result and how to dial them in for a crisp, engraved photo on wood.

If you're tired of ruining good wood dialing in photo settings, Silhouette U has the full walkthrough plus same-day, personalized expert help when you get stuck.

Note: This post may contain affiliate links. By clicking on them and purchasing products through my links, I receive a small commission. That's what helps fund Silhouette School so I can keep buying new Silhouette-related products to show you how to get the most out of your machine!

No comments

Thanks for leaving a comment! We get several hundred comments a day. While we appreciate every single one of them it's nearly impossible to respond back to all of them, all the time. So... if you could help me by treating these comments like a forum where readers help readers.

In addition, don't forget to look for specific answers by using the Search Box on the blog. If you're still not having any luck, feel free to email me with your question.