Laser Tile horizontal lines

[donald bugansky]

I think it's more of a resolution issues as it appears to be more of an moire effect.

Bugs

[JAIME PUJOL]

Thanks Ross that website help me understand more on resolution. I did couple of test run today. With some improvements I believe the problem is along what everyone stated in regards to resolution. Today test run. Here is my procedure.
1) Import photo and resize using resample
2) Crop to fit my work area
3) Resample to 300 DPI ( Photo is at 72 dpi in order to process to laser need to make higher dpi)
4) I try 300,400 and 600 dpi on machine output. all about the same result with the lines. Put better than before it could be the way I am setting up the job.
Hopefully someone will see what I may be doing wrong.
Also I never updated the driver for my laser and the machine is now six year old could this be a problem.
Thanks

[Scott Shepherd]

It's coming from the resampling. You can't just resample something that's low resolution to high resolution. It's exactly the problem I described before on the 2nd post. If you resample it, you need to apply a guassian blur to it in your photo editor.

[James Stokes]

I am in disagreement on that 500 dpi. For tile or granite I never go above 200 dpi and just normal engraving 300 dpi. That works great for me.

[Martin Boekers]

When I go to 300 dpi I get a visible "crosshatch" halftone pattern that is visible. Am I doing something wrong? When I go to 600 dpi it isn't visible.


Marty

[Linda Kroeker]

this sounds kinda like the problem I had with a photo on acrylic...a few posts down...leaving banding lines.
I've read everyones suggestions in my post and this one...but I am so computer dumb...or photo prep dumb.
Is there somewhere I can get a simple check list or something...that is from the point of scanning a photo or exporting a photo into corel.
I have looked but I just don't understand it all.
Scan, import, size it, grayscale..etc???
Linda

[Ross Moshinsky]

When I go to 300 dpi I get a visible "crosshatch" halftone pattern that is visible. Am I doing something wrong? When I go to 600 dpi it isn't visible.


Marty

No. Some people aren't as particular as others. On my materials I run daily, I've run resolution, speed, and power tests on all of them. Not once have I seen 300dpi where the letters actually looked right. They are never smooth and they are never perfectly clear. 500dpi is perfect. As good as 1000dpi as examined with a jewelery loop.

From 1 foot away, you won't notice the difference between 300 and 500dpi. 6", you will. I think my stuff should look great always, not "only from a distance".

[Norberto Coutinho]

This look me like barbed wire on original photo....

[Frank Corker]

Norbetto, that is barbed wire, I think they are actually talking about the banding marks which you can see in the background. When I first posted my reply saying dirty encoder strip, I was not able to see the picture close up on my tablet. Now that I see it closer up I would say that it has to be down to the way that the image was processed.