Plot (image( )) Real RGB Colors of an Imported GeoTIFF (readGDAL( ))

Hi List members.

I?m actually able to import a Georeferenced image (.tiff) using readGDAL
{rgdal} and plot it using image {Graphics}.

But the colors options available in the image function (topo.colors,
heat.colors, terrain.colors, etc) aren?t able to adequately reproduce the
original image. The tiff file represent land and ocean, so I need brow and
green tones to land and blue tones to ocean. I was able to create the blue
tones with colorRampPalette () but these blue tones are also applied to the
land.

Once imported the object containing the raster georeferenced file brings
three data columns with bands (RGB maybe) values of each cell (I guess).
Isn?t there a way to reproduce the real colors using these columns
information or any other way to do so?



Thank you on advance for the patience and help.



Below, some useful information on the object:

BC<-readGDAL('C:/Users/Rodrigo/Documents/Shapefiles/Campos/BaciaCampos-GE-SA
D69-LongLat.tiff')

C:/Users/Rodrigo/Documents/Shapefiles/Campos/BaciaCampos-GE-SAD69-LongLat.ti
ff has GDAL driver GTiff

and has 3350 rows and 3015 columns

summary(BC)

Object of class SpatialGridDataFrame

Coordinates:

? ? ? ?min ? ? ? max

x -42.15808 -39.58503

y -23.74079 -21.08709

Is projected: FALSE

proj4string : [+proj=longlat +ellps=aust_SA +no_defs]

Number of points: 2

Grid attributes:

?cellcentre.offset ? ? cellsize cells.dim

x ? ? ? ? -42.15765 0.0008534147 ? ? ?3015

y ? ? ? ? -23.74040 0.0007921499 ? ? ?3350

Data attributes:

? ? band1 ? ? ? ? ? ?band2 ? ? ? ? ? ?band3

?Min. ? : ?0.00 ? Min. ? : ?0.00 ? Min. ? : ?0.0

?1st Qu.: 48.00 ? 1st Qu.: 67.00 ? 1st Qu.: 95.0

?Median : 70.00 ? Median : 89.00 ? Median :117.0

?Mean ? : 65.17 ? Mean ? : 83.37 ? Mean ? :117.7

?3rd Qu.: 76.00 ? 3rd Qu.: 97.00 ? 3rd Qu.:150.0

?Max. ? :255.00 ? Max. ? :255.00 ? Max. ? :255.0



Regards



-------------------------------------------------------------

MSc. ?<mailto:r.aluizio at gmail.com> Rodrigo Aluizio

Centro de Estudos do Mar/UFPR
Laborat?rio de Micropaleontologia
Avenida Beira Mar s/n - CEP 83255-000
Pontal do Paran? - PR - Brasil


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