>To my knowledge GIMP does not support laser engraving machines like
>Legend Helix 24 Laser.
>The spesifications for Legend Helix 24 Laser:
>There exists a backend named epilog-cups for the legend brand of
>engravers/lasers, but it seems fiddly to use and no GUI or PPD files
>exists to my knowledge. I think that the epilog-cups backend only
>with inkscape, but i am unsure because i dont have a Legend laser so i
>cannot test it. 
>At present state, the user of epilog-cups needs to set up and make a
>printer for each typer of material. 
>That has some advantages, but the power and resolution and speed
>apparently cannot be adjusted with ease. Anyway, it should be
>possible to add a suitable plugin with a GUI that can store the
>settings for a type of material.  
>1mm beech plywood, cutting.
>Ti6Al4V (titanium,polished) engraving
>epilog-cups is located here + some info on how to set it up:
>cups-epilog.c is here:
>The AS220 CUPS-Epilog driver converts postscript input into a .PJL
>file, that is sent to the Laser Cutter/engraver. Apparently the Epilog
>uses this HP printer control language!
>( source=
>http://wiki.laoslaser.org/index.php/PrinterDriver#Example_code )
>Epilog laser engraver
>The Epilog laser engraver comes with a windows printer driver. This
>works well with Corel Draw, and that is about it. There are other
>windows applications, like inkscape, but these rasterise the image
>before sending to the windows printer driver, so there is no way to
>them to vector cut.
>information on cups-epilog follows:
>The cups-epilog app is a cups backend, 
>so build and link/copy to /usr/lib/cups/backend/epilog. It allows you
>to print postscript to the laser and both raster and cut. It works
>with inkscape.
>With this linux driver, vector cutting is recognised by any line or
>curve in 100% red (1.0 0.0 0.0 setrgbcolor).
>Create printers using epilog://host/Legend/options where host is the
>hostname or IP of the epilog engraver. The options are as follows.
>This allows you to make a printer for each different type of
>material.af Auto focus (0=no, 1=yes)
> af optimise vectors (0=no, 1=yes)
> r Resolution 75-1200
> rs Raster speed 1-100
> rp Raster power 0-100
> vs Vector speed 1-100
> vp Vector power 1-100
> ov Re-order vectors to reduce time
> vf Vector frequency 10-5000
>sc Photograph screen size in pizels, 0=threshold, +ve=line, -ve=spot,
>used in mono mode, default 8.
> rm Raster mode mono/grey/colour
>The mono raster mode uses a line or dot screen on any grey levels or
>colours. This can be controlled with the sc parameter. The default is
>8, which makes a nice fine line screen on 600dpi engraving. At
>600/1200 dpi, the image is also lightened to allow for the size of the
>laser point.
>The grey raster mode maps the grey level to power level. The power
>level is scaled to the raster power setting (unlike the windows driver
>which is always 100% in 3D mode).
>In colour mode, the primary and secondary colours are processed as
>separate passes, using the grey level of the colour as a power level.
>The power level is scaled to the raster power setting. Note that red
>is 100% red, and non 100% green and blue, etc, so 50% red, 0%
>green/blue is not counted as red, but counts as "grey". 100% red, and
>50% green/blue counts as red, half power. This means you can make
>distinct raster areas of the page so that you do not waste time moving
>the head over blank space between them.
>It seems to me that the epilog-cups does not support 3D engraving.
>3D mode looks at the dots and the dot patterns in a very different way
>than Basic raster engraving mode, especially where it concerns either
>color, or grayscale images.
>In 3D mode, instead of looking at the dots and determining where to
>fire the laser based on the dot spacing, Epilog Laser look at the dots
>and determine how much laserpower (wattage) to apply to each dot, and
>that’s the big difference between Basic raster engraving mode and 3D.
>In Basic raster engraving mode, every dot is fired at the same laser
>output (wattage). In 3D mode machine have the ability to adjust the
>laser output for every dot.
>An additional aspect of 3D mode is that, unlike Basic mode, the laser
>fires continuously between most dots – even if it is engraving from a
>10% fill pattern to a 30% fill pattern. This is by design so there is
>gradual change in the depth of engraving when the artwork transitions
>from one shade of gray to another. The only time that this is not true
>is when the artwork changes from 100% black to 100% white (or visa
>Any opinions ?


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