search for: pixmapgrey

Dear R users I have a two-dimensional array, whose values I want to plot, using the pixmapGrey class. Plotting works fine, and now I would like to be able to identify some of the points in the plot using identify(). But I get the following message while pressing the left mouse button: > plot(pixmapGrey(fmri.vtc[,,slice,volume])) > identify(fmri.vtc[,,slice,volume]) warning: no point w...

Hi I need to overlay two pixmaps (library (pixmap)). One, a pixmapGrey, is the basis, and on this I need to overlay a pixmapIndexed, BUT: the pixmapIndexed has set only some of its "pixels" to an indexed color, many of its pixels should not cover the basis pixmapGrey pixel, means, for this "in pixmapIndexed not defined pixels" it should be transpar...

...boon) list() - attr(*, "size")= int [1:2] 512 512 - attr(*, "cellres")= num [1:2] 1 1 - attr(*, "bbox")= num [1:4] 0 0 512 512 - attr(*, "channels")= chr "grey" - attr(*, "bbcent")= logi FALSE - attr(*, "class")= chr "pixmapGrey" - attr(*, "grey")= num [1:512, 1:512] 0.537 0.510 0.345 0.259 0.322 ... > class(baboon) [1] "pixmapGrey" > library(pixmap) > plot(baboon) > identify(baboon, n=1) ... and then R bombs! What to do? Kjetil Halvorsen

...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 ***************************************...

...: 6x12 Resolution : 1x1 Bounding box : 0 0 12 6 Nr. of colors : 72 of 8 > write.pnm(x, file="D:/Temp/output.pnm") Error in options(x) : evaluation nested too deeply: infinite recursion / options(expression=)? > Grey ones work but with a warning... > x <- pixmapGrey(rep(1:8, 9), nrow=6) > x Pixmap image Type : pixmapGrey Size : 6x12 Resolution : 1x1 Bounding box : 0 0 12 6 > write.pnm(x, file="D:/Temp/output.pnm") Warning message: connection is already open > Any ideas? Cheers, Ben [R 1.9.1 and Pixmap...

Hi R users: I got the following message when I use the pixmap library on R 1.7.0 over w2K platform (on R 1.6.2 it runs right). pixmapGrey(matrix(c(0,1),128,128)) Error in .class1(object) : Object "from" not found I download the library .zip file from: http://cran.r-project.org/bin/windows/contrib/1.7/pixmap_0.3-2.zip Other question: When I try to "Install package(s) from bioconductor" I got the following messa...

...:2] 512 512 > > - attr(*, "cellres")= num [1:2] 1 1 > > - attr(*, "bbox")= num [1:4] 0 0 512 512 > > - attr(*, "channels")= chr "grey" > > - attr(*, "bbcent")= logi FALSE > > - attr(*, "class")= chr "pixmapGrey" > > - attr(*, "grey")= num [1:512, 1:512] 0.537 0.510 0.345 0.259 0.322 > > ... > > > class(baboon) > > [1] "pixmapGrey" > > > library(pixmap) > > > plot(baboon) > > > identify(baboon, n=1) > > > > ... an...

...39;t compile it..  It is said "Error in is.data.frame(x) : object 'lena' not found" Here is the original full code: library(pixmap) lena <- read.pnm("oldlennablur.pgm") write.table(lena@grey,"mylenna", quote=FALSE, row.names = FALSE, col.names= FALSE) plot(pixmapGrey(as.matrix(read.table("mylenn")))) do you know why i got the error? i have change the "oldlennablur.pgm" with the one i have and also with the specified path on my computer..| And would you like give me an explanation about "read.pnm". I need to know what result will i...

Dear all, I try to figure out how to use R to count the number of pixels of the same color in some gray-level picture. I managed to read it in either tiff or jpeg format, but the returned pixmap object keeps its information out of (my) reach. Is there an easy way to tabulate the different color/graylevel pixels and their numbers? Or should I use a completely different (free) software?

Hi: Goal: use R to turn a matrix of 1's and 0's into a corresponding image (e.g. png) of black and white pixels. Why R: Yes, I can do this more efficiently and precisely with a perl module like Image::PBM. Been there, done that many times, etc. (Just humor me. I'm trying to do this with R for a number of reasons.) Problem:

Dear all, I have been trying to speed up a process we have been done in ArcGIS. We have to read a single layer TIFF (monochrome image) in . For this, I have used the "rtiff" package. After reading the TIFF file, I compared the raw values for each pixel that I have in ArcGIS to the ones obtained in R. In ArcGIS I have discrete values in the range 0..255, while in R I have continuous