Thanks to all. For the time being due to urgency I will stay with a copy of R 2.15.x with which ReadImages works. It is simplest solution which I can adopt immediately without much additional effort. However I will need to elaborate another solution in future, for which I will consider various suggested options. Regards Petr
From: Greg Snow [mailto:538...@gmail.com] Sent: Friday, February 22, 2013 5:54 PM To: PIKAL Petr Cc: r-help Subject: Re: [R] package ReadImages For some of the fancier transforms it may be easier to use an outside tool such as Imagemagick which will do a lot of these things. There is even a C++ interface to imagemagick that may work nicely with packages like Rcpp if you don't want to use an intermediate file. But jobs like converting to grayscale can be very simple using R itself. Many of the functions that read in images store them as 3 dimensional arrays and you would just need an apply command to change the 3 values for each pixel to a grayscale value (see col2gray in the TeachingDemos package for one way to do this, though loading in the whole package is probably overkill for something this simple). On Fri, Feb 22, 2013 at 1:57 AM, PIKAL Petr <petr.pi...@precheza.cz<mailto:petr.pi...@precheza.cz>> wrote: Thanks. I tried EBImage several years ago for another problem, but Bioconductor packages have some difficulties to install in our network/firewall environment and I am not in a position to change it. It seems to me also an overkill for such simple task. jpeg and png seems to me a bit too much simple, without direct possibility to transform from rgb to grayscale and normalisation. Anyway, I will give it a try. Petr From: Greg Snow [mailto:538...@gmail.com<mailto:538...@gmail.com>] Sent: Friday, February 22, 2013 6:45 AM To: PIKAL Petr Cc: r-help Subject: Re: [R] package ReadImages Some possibilities: The EBImage package on Bioconductor; the jpeg and png packages read jpeg and png images. On Thu, Feb 21, 2013 at 8:26 AM, PIKAL Petr <petr.pi...@precheza.cz<mailto:petr.pi...@precheza.cz>> wrote: Dear all I prepared some image processing routine which depended on package ReadImages. Basically I imported image to R, changed rgb to grayscale, normalised an image made some selections and changed to image by imagematrix. Recently I learned that this package was removed from CRAN and can not be used in R 3.0.0. What options I have now to import image to R, change it to grayscale, make some computation or selection, change it back to image and plot for visual inspection. Thanks Petr ______________________________________________ R-help@r-project.org<mailto:R-help@r-project.org> mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. -- Gregory (Greg) L. Snow Ph.D. 538...@gmail.com<mailto:538...@gmail.com> -- Gregory (Greg) L. Snow Ph.D. 538...@gmail.com<mailto:538...@gmail.com> [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
