Should I Use Passthrough in Lightburn to Engrave on Painted Canvas?

In this video I will show you a comparison between ImagR and Da Big Gimpin plugin using passthrough and no passthrough.
When setting up images to engrave in Lightburn, you have the option to use Passthrough. This option uses the settings that the file was processed with either in ImagR or Gimp using Da Big Gimpin plugin.
I will walk you through processing the same image in both applications, import them into Lightburn, set them to use Passthrough and No Passthrough, engrave on a white canvas painted black and do a side by side comparison of the results.
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Willowtree Woodworking: Makers and Creators of Hand Crafted, Custom Made Furniture, Home Decor, Laser Engraved Products & Services
I have created and hand crafted custom furniture and décor for several years. I began working with my dad when I was a kid and learned the art of patience, attention to detail and craftsmanship. I began teaching my children in their teen years as a way to connect, grow and share my passion for woodworking.
My son has a keen eye for detail and is very methodical in his approach to getting everything just right. My daughter is the complete hippie from another era and love to design and create.
As they are now young adults and out on their own (well almost), I began creating custom furniture and décor as I have been approached many times by people to craft a special item just for them or a loved one.
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[@ltrick2387]

You do a great job with these videos. No skipped steps and a great job of explaining as you go along. Thanks!

[@wtwtx]

Thank you, I appreciate that. I’m for sure not a TH-camr so glad to hear they are helpful

[@genabush4619]

I dont know what I would do without your videos. I just did my first canvas today and its running at the moment and looks good so far! And P.S. Horse lover here too. We have Gypsies :)

[@wtwtx]

Glad they have helped.

[@0to100Art]

you make it simple for us so we can easily understand it. No words Really Amazing Well done.

[@wtwtx]

I appreciate the great feedback, thank you.

[@tkrueger5077]

Thank you for the information and excellent work!
When you used the process with Gimp, you needed to turn off the negative image. This probably why it looked different from the others.
Why do you use image-r dpi at 320 and Gimp at 600dpi? Would it be more comparable to have the same dpi?
Again, thank you for your video and excellent work!!!

[@wtwtx]

Using a higher dpi before exporting the image from gimp or imgr produces a better graphic. Using 320 in Lightburn keeps a good image quality but allows the image to engrave faster.

[@AtTheZebo]

You should include an image done directly in Light Burn for comparison.

[@wtwtx]

That’s already been done by a few people. This video came from requests to compare using and not using passthrough.

[@robertarmstrong2323]

Sometimes I forget, bring pic in from Imagr and dont pass through and it comes out better..also it seems everytime I bring in black tile image from imagr, I have to also click negative in lightburn

[@wtwtx]

I rarely use pass through if I set the image up in imagr. I will typically change to Jarvis, set dpi to 320 and it comes out better.

[@DustanWebb]

So you are just basically double processing it once with gimp(newspaper) and once with lightburn(jarvis) ? If I'm understanding you correctly, then it seems that someone who has the abilty, needs to make a better algorithm that combines these two?

[@wtwtx]

Somewhat. It’s not exactly double processing. The newsprint option that the gimp plug-in applies does not yield great results as is using passthrough. I’m simply leaving the image as is just choosing Jarvis as the result is better. I’m not adjusting the image in Lightburn other than the image mode.

[@adjbuzz]

@@wtwtx the jarvis image mode in Lightburn is actually processing the image again, similarly to how imagr does. That's also why the two imagr ones look very similar to each other. For the gimp PT one, I think you should have selected negative image. You don't need to for Imagr as it makes the image negative while processing, it seems like Lightburn's native processing (jarvis, stucky, etc.) also makes it negative by default as well, but PT does not. You should give the grayscale image type a try for imag-r-processed images, I think you'll really like the results. It is a little tougher to get the right max/min power settings down, but I usually do a test canvas alongside any actual canvas I am doing so I can dial each in.

[@wtwtx]

@@adjbuzz Thanks for the input, I'll have to give that a try.