Engraving on Black acrylic

[Carol Barbero]

This is the piece I'm going to attempt to put it on.
http://www.laserbits.com/index.php?m...oducts_id=1012

They indicated that the entire engraving area is acrylic with a black plastic backing.

I'll let you know how it goes tomorrow. The whole photo and inverting thing just messes with my head!

[Brian Robison]

Oh, you'll be fine.
too bad you don't have some practice black cast acrylic.
Are you in Wilseyville, Ny? Maybe West Spencer?

[Carol Barbero]

Brian:
No I'm not. Thanks for the help.

[Brian Robison]

Too bad, I was going to offer up Steve to help you out!

[Tim Bateson]

The whole photo and inverting thing just messes with my head!

You'll be engraving the back so the picture needs to be flipped so it looks correct from the front. Another way to look at engraving on black is you need to engrave a negative and on white you engrave a positive image.

[Barbara Sample]

You definitly need to change the picture to greyscale. I use photograv to process my photos so I am not positive how to do it otherwise. I do think you have to invert it but am not sure. Try it on a small piece and engrave at 300 dpi auto ppi, see if that works for you. I have a 30W machine and I use 40 power 100 speed.
Good luck, Barbara

[Chris J Drew]

You definitly need to change the picture to greyscale. I use photograv to process my photos so I am not positive how to do it otherwise. I do think you have to invert it but am not sure. Try it on a small piece and engrave at 300 dpi auto ppi, see if that works for you. I have a 30W machine and I use 40 power 100 speed.
Good luck, Barbara

I don't know about Photograv but if you're not using that then you definately don't want to convert to greyscale.
Convert photos to 1-bit black&white using the Stucki dithering within Corel Draw.
This bypasses the driver's conversion dithering & gives you more control.
If your image needs scaling then do this before converting to 1-bit.

PPI doesn't apply to an Epilog machine, the nearest thing to PPI on the Epilog is Frequency, but that only applies to vectoring, not rastering.

Only invert your image if the lasering has a lightening effect on the material.