Hi All,
I have a greyscale image that I am reading in through RGDAL and placing in a
pixmap object.
As an example use the logo.jpg file that comes with the RGDAL package:
#Read the file
logo <- system.file("pictures/logo.jpg", package="rgdal")[1]
x <- new("GDALReadOnlyDataset", logo)
#Create the pixmap object
xGrey <- getPixmapGDAL(x)
Now I would like to read individual pixel values and store them in a
separate vector. However I have not found a straight-forward way to do this.
I thought that something like:
x <- xGrey[1,1]
would return the pixel value, but it seems to return a pixmap object with
dimension 1x1 (i.e. only one pixel in size)
xGrey[1,1]
Pixmap image
Type : pixmapGrey
Size : 1x1
Resolution : 1x1
Bounding box : 1 0 2 1
Any ideas on how to get the actual pixel value from a pixmap? (Note I could
output to an ascii file and then read the file back in as text - but not
nice!)
Thanks in advance
Tony
******************************************
Tony Gill - PhD Candidate
Centre for Remote Sensing & Spatial Information Science
School of Geography, Planning & Architecture
University of Queensland
Brisbane, Queensland, AUSTRALIA, 4072
Ph: 61-7-3365-7027
email: [EMAIL PROTECTED]
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