Hi George
The Transparency feature in MapImagery is really for viewing 2 or more
raster data sets on top of one another. It works quite well for
this. The raster layers have to be part of the same algorithm for this to
work (ie they can't be in separate MapInfo layers).
What you are trying to do - have vectors show through rasters - is possible
with MapImagery via the technique described below. Although, I am not
sure if this will produce exactly the result that you are looking for.
1) Use the following formula to create a halftone raster imagery.
if( ((pixelx() + pixely()) % 2 )) THEN INPUT1 ELSE NULL
or
if( ((cellx() + celly()) % 2 )) THEN INPUT1 ELSE NULL
You should apply this to each layer. You can cut and paste this into the
MapImagery formula editor, although note there is a bug in the formula
editor of the current version, which removes the '%2' from the generic
formula. I'll fix this problem in the next version.
2) Use the Table -> Raster -> Adjust Image Style -> Transparency and choose
the background color of the MapImagery layer (you might have to zoom right
in to pick a null pixel).
3) Move the vector layers to the back via the MapInfo layer control
The rasters should show through.
If you don't like the half tones created by the above formula , then you
can create almost any pattern that you like using similar logic (eg
circular holes, diagonal crosshatch, horizontal strips etc). If you need
some more ideas on this, please ask.
Note that 2 MapImagery settings that I can think of interact with this
technique:
a) The Supersampling factor, you may have to set this to 1 and then
regenerate your .tab file
b) Smoothing. You may need to switch smoothing off for the algorithm.
I hope this helps, please let me know how you get on.
Andrew
At 09:04 31/10/00 -0700, George M. Smith wrote:
>I really wish that it was this simple and perhaps I am still missing
>something. I am referring to "Transparency %" under the
>MapImagery>Layers>Surface Menu. Have you used this "functionality"? It was
>my understanding that this was supposed to make vector and/or other
>rasters visible through a rasters from within MapInfo. MapImagery suggested
>setting the Background to white and various ordering of Layers and adding
>Layers. None of these work for me. This was a major drawing card for me for
>buying the program and if I cant get it to work then I'll have to try a
>different software avenue or put that desire/need and it's associated
>expense on hold.
>
>Regards
>
>George M Smith
>
>At 11:11 AM 10/31/2000 +1100, you wrote:
> >If your talking about Table/Raster/Adjust Image Style I think I know the
> >problem.
> >
> >If your using MapInfo 5.5 or older go to the MapImagery Options and set the
> >Colours to 256
> >
> >Then Table/Raster/Adjust Image Style should work.
> >
> >MapInfo 6 fixed this problem.
> >
> >Howard...
> >
> >-----Original Message-----
> >From: George M. Smith [mailto:[EMAIL PROTECTED]]
> >Sent: Monday, October 30, 2000 11:22 PM
> >To: [EMAIL PROTECTED]
> >Subject: MI-L MapImagery and MapInfo
> >
> >
> >Has anyone successfully used MapImagery to display rasters as transparent
> >over vector or raster files in MI and if so is there a "trick" or
> >documented or undocumented sequence of steps? I'am having no luck.
> >
> >Regards
> >
> >George M Smith
> >GeoMax Information
> >www.geomax.com
> >[EMAIL PROTECTED]
> >303.4404539
> >303.7274679 Fax
> >GIS analysis, software and training , data capture and manipulation
> >Specialists in Geology and Minerals Exploration
> >
> >
> >_______________________________________________________________________
> >List hosting provided by Directions Magazine | www.directionsmag.com |
> >To unsubscribe, send e-mail to [EMAIL PROTECTED] and
> >put "unsubscribe MapInfo-L" in the message body.
> >
> >
> >_______________________________________________________________
> >
> >>From Friday 21st July 2000, AngloGold Australasia can no longer
> >forward messages addressed to acacia.com.au
> >Email addresses should be changed now by replacing
> >acacia.com.au with anglogold.com.au.
> >_______________________________________________________________
> >
> >_______________________________________________________________
> >
> >This e-mail message contains confidential information which is
> >intended for the use of the person to whom it is addressed.
> >If you received it in error, please notify the sender and
> >delete the material from any computer. Any disclosure,
> >re-transmission, dissemination or any other use of this
> >information is strictly prohibited.
> >_______________________________________________________________
> >
>GeoMax Information
>www.geomax.com
>[EMAIL PROTECTED]
>303.4404539
>303.7274679 Fax
>GIS analysis, software and training , data capture and manipulation
>Specialists in Geology and Minerals Exploration
--------------------------------------------------
Andrew Hunt [EMAIL PROTECTED]
MapImagery Limited http://www.mapimagery.com
MapImagery Professional available for purchase now
--------------------------------------------------
_______________________________________________________________________
List hosting provided by Directions Magazine | www.directionsmag.com |
To unsubscribe, send e-mail to [EMAIL PROTECTED] and
put "unsubscribe MapInfo-L" in the message body.
