picture engrave only lines

[curious]

hi
i tryd to engrave a picture ,but the laser only engraves horizontal lines ?
it dousnt even look like a picture ?

i use lasercut 5.3
tube 180W
picture from photograv
changed W/scan gap/filled/speed.

picture of result attached

who has an idea ?

[cinematic2]

Have you ever heard about rasters?

[bpoulin]

post the image you are trying to etch.

[curious]

i found the problem
it was the red high power cable what was touching the blue wire
many strange things happened with the laser ,like a poltergeist

now its working ok.
only engrave on glass is still not ok
tryd wet paper ,low dpi on wood its ok.

[bpoulin]

Can you post the pics of what your glass looks like after a failed etch, and the original image you want on the glass? We might be able to help you.

[curious]

this is on the glass, as you can see there is missing detail
on wood its sligtly better

also is attached original foto before changing to b/w and photograph software

i hope some there is a way to improve the quality

[Tweakie]

I think this is just one of those techniques you will have to practice at to get it right. You are perhaps using too high a power level on the wood and loosing detail there but the image itself is probably not the best you could be using. Really you need to use images with high contrast ratios to get the best results and here the dog is sitting in partial shade.
I ran your image on wood and my results were not very good either.

Tweakie.

[curious]

could you post an image with good contrast ?
to see the difference

[Tweakie]

First one I came across using the same wood.

Tweakie.

[bpoulin]

Wow, tweakie impressive results. Given the image, I think it's the best burn you could get. I 2nd the opinion that you are using too much power. That may be the problem with the glass as well. Try using a lower power to see those results.

[curious]

its getting better ,tweaky send me a picture i lasered on glass.
from the side its looking far better than from the front.
also if i put the glass in front of another glass there is more detail.

what i wonder is ,what is the relation between thickness of the engraving line ,and the max.sharpness.
eg if the picture is too small there is no detail,increase size its getting better.
is there a calculation ?

or how is it possible to get really photo quality ?

[bpoulin]

Originally Posted by curious its getting better ,tweaky send me a picture i lasered on glass. from the side its looking far better than from the front. also if i put the glass in front of another glass there is more detail. Work on your focus, what you think is in focus may actually be out of focus. Try this, fire your laser in test mode so you have a single dot, then manually move the laser over a step or two, then move your table up a step, and fire again, do this 5-10 time in a row, and compare the dots left, do this until you find the smallest dot, and that is your true focal point. If the dots only get bigger, return to your start point and move away from the lens. what i wonder is ,what is the relation between thickness of the engraving line ,and the max.sharpness. YES there is a huge relation, think DPI on a printer, if you use an old dot matrix printer that has 12dpi vs a new inkjet that can have 700dpi or more. The difference would be obvious, the same is true for the laser, the smaller the focal point, the finer the dpi, the more detailed the picture. If you need a finer dot, you'll need to get a different focal length lens. As far as lenses go, usually one that's good for cutting is bad for engraving, and one that's good at engraving is bad at cutting. eg if the picture is too small there is no detail,increase size its getting better. is there a calculation ? Unfortunately if the picture is too small to start with you can't just enlarge it to gain detail. Once the image is compressed to a small size detail is permanently lost. You always need to start with the largest image possible, so you have all the detail. You can then down size the image to your needs. or how is it possible to get really photo quality ?

Start with a high quality photo to engrave.