Re: [CAD_CAM_EDM_DRO] Re: pixel information

Hi:

I don't think feedrate controlled depth is possible. From a feed
perspective, this would not allow ramping of any kind which would
create a smearing between pixels. The best solution would be to have an
output control pin to pulse the laser a number of times equal to a lookup
table of pulses vs color which is calibrated to depth. Could be done by
recoding stepster or any other open code stepper driving software fairly
easily I would think.Just raster step the matrix of the image, get color of
pixel, and pulse an output pin the number of times required...repeat.

( just my two cents)

Art

----- Original Message -----
From: <cadcamcenter@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Sunday, May 27, 2001 3:26 AM
Subject: [CAD_CAM_EDM_DRO] Re: pixel information


> Hi Bob,
>
> Thanks for the info. I understand that most CNC laser control
> the "depth" through the number of laser pulses - darker shade = more
> pulses. Wonder if it is possible to control "depth" via feedrate,
> darker = slower, brighter = faster. Seems to my layman's mind that
> this will be much more difficult.
>
> Peter
>
> --- In CAD_CAM_EDM_DRO@y..., "Bob Campbell" <bob@c...> wrote:
> > Peter,
> >
> > There are a number of programs that will look at the gray scale
> value (1 to
> > 256) and set a different Z depth for each level. Kern lasers is
> using
> > Cimagrafi to set the different power levels for their lasers. For
> them it
> > works great.
> >
> > What you are looking for would be a great application for a VBA
> program.
> > Programs like Corel Draw have VBA support.
> >
> > Bob Campbell
> >
> > ----- Original Message -----
> > From: <cadcamcenter@y...>
> > To: <CAD_CAM_EDM_DRO@y...>
> > Sent: Saturday, May 26, 2001 1:24 PM
> > Subject: [CAD_CAM_EDM_DRO] pixel information
> >
> >
> > > Hi List,
> > >
> > > There are CAM programs which turn graphics (bitmap etc) into
> > > toolpaths converting color to z-depth, etc.
> > >
> > > If we have a digital image, how do we extract the color
> information
> > > (hue, saturation, brightness...) from it?
> > >
> > > To clarify further: For example, we have a greyscale map of USA
> with
> > > each State coloured a different shade of grey. Is there a way
> (with
> > > Photoshop, Wintopo, or other program) we can press a button so
> that
> > > the State with the color (eg brightness) value of 50 (or between
> 48
> > > and 52) will be isolated (or highlighted)? Or if we placed a
> cursor
> > > over the area (pixel) and a pop-up balloon gives information on
> the
> > > color value of that area (pixel)
> > >
> > > Thanks
> > >
> > > Peter
> > >
> > >
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