Fiber laser output does not match preview

LightBurn Software Questions
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1

I own a Gweike G2, it’s usable in Lightburn since v1.7.0, which I’m running (stable). It’s recognised as a BSLFiber in Lightburn.
I’m trying to work with photos, and I noticed a few strange things. I can’t figure out why my photos are always being engraved with inverted colors.
I used the “adjust picture” menu, in this menu there is a “negative” slider.
When I change this slider, the preview laser path changes accordingly.
But when I launch the engraving, it does not match the preview.
The issue is broader than just pictures, some changes are not being taken into account for the output.
I’ll give you another example, this one I can replicate 100% of the time : include 2 pictures like this.

image
image617×609 14.6 KB

Try to frame. It works. Than select the 2 pictures at the same time, and scale them down. Frame. As expected, the frame reduced in size. Great.
Now revert to the original size, group the 2 pictures, and scale down the group. Frame. Now we have a problem : the framing has the size prior to scaling down. If we start the engraving, it will engrave the big set of pictures, although we scaled it down.
Yet if we look at the preview laser path, we can see that it shows less scan lines after scaling down. So the preview is ok, but the output does not match the preview.
I can provide more informations if needed, feel free to ask.
Thank you

2

I just updated to 1.7.01, the problem still happens.
I did a little bit more testing, and I think that there is in fact 2 distinct problems. The first one is relative to my image’s colors not being inverted when they are in the preview laser path so the preview does not match the real job.
But there is a second problem with grouped images.

If I create a large rectangle and I add an image in the middle of it, then I group both objects, and finaly I move the group almost out of the working area, so the recangle is partly outside but the image is still inside, then the rectangle will be ignored, which is to be expected.
But when framing, I can see that the image is at the position it was when I grouped it with the rectangle, not where I moved it.
If I look at the preview, I can see that it is in fact placed at the right position, and if I run the job, it engraves at the right position.
So this issue affects specifically the framing.

3

This part of my first message is wrong, it will in fact engrave the group with the right size, only the framing is bad