Steve,
You don't have to copy the raster tiles, just the .tab file. The .tab file
is a text file, which for your raster tables refers to the .tif file & you
can set up as many .tab files as you like referring to the same .tif file -
they don't have to be in the same folder - you can include a full pathname
in the File line. For example, here are some excerpts from .tab files.
1. The original colour representation (I've named it z_col_tv.tab) -
Definition Table
File "z_lzw_tv.tif"
Type "RASTER"
(500000,100000) (1,1) Label "NW",
(600000,100000) (4001,1) Label "NE",
(600000,90000) (4001,401) Label "SE",
(500000,90000) (1,401) Label "SW"
CoordSys Earth Projection 8, 79, "m", -2, 49, 0.9996012717, 400000,
-100000
Units "m"
2. A greyscale representation of the same .tif file (I've named it
z_gry_tv.tab) -
Definition Table
File "z_lzw_tv.tif"
Type "RASTER"
(500000,100000) (1,1) Label "NW",
(600000,100000) (4001,1) Label "NE",
(600000,90000) (4001,401) Label "SE",
(500000,90000) (1,401) Label "SW"
CoordSys Earth Projection 8, 79, "m", -2, 49, 0.9996012717, 400000,
-100000
Units "m"
RasterStyle 3 1
RasterStyle 3 is the setting that turns greyscale on.
To adjust contrast and brightness, add further lines using RasterStyle 1
for brightness and 2 for contrast. Thus
RasterStyle 1 70
RasterStyle 2 70
sets both to 70 percent.
You can do all this using a text editor (or program).
Regards
Leslie Last
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> From: Steve Halsall <[EMAIL PROTECTED]>
> To: '[EMAIL PROTECTED]'
> Subject: MI colour/greyscale raster
> Date: 10 August 1999 13:47
>
> Hi
>
> I am using the UK Ordnance Survey 1:50,000 raster mapping (tif format)
with their Boundary Line product. The tif map tiles are in colour which is
great for when I want to view an area. However I am mainly interested in
the boundaries (from Boundary Line) and just need the raster mapping for
reference. For printing purposes I change the raster image to greyscale and
change the contrast and brightness to about 70% using the Adjust Image
Style option in Mapinfo. This produces the output that I want but
unfortunately it appears to make this change to the raster map rather than
in the MapInfo table or the Workspace. This causes problems as the next
time I open the raster map it may not be in the format that I require.
>
> The only solution I have come up with is to copy the raster tiles (84 of
them!) and rename them, then I will have to rename the relevant MapInfo
registration tables (and edit them to point to the correct raster file). I
can then use both sets of raster maps within MapInfo switching them off and
on as required.
>
> Before I go ahead I would like to ask list members if they have found an
easier way?
>
> Steve Halsall
> LGBCW
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