User: Gregoire Pau

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Gregoire Pau310
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Posts by Gregoire Pau

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EBImage crop failure
... Hello Michael, EBImage represents images as multidimensional arrays. Color images are usually represented as 3-dimensional ones, where the third dimension contains the color components. >From your example, it seems that are you are manipulating 3-dimensional arrays, explaining why "a[1:120,50:1 ...
ebimage written 6.3 years ago by Gregoire Pau310 • updated 6.3 years ago by Michael Cole20
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Answer: A: Problems loading EBImage-package in R
... Hello Peter, EBImage works well on Windows machines. It seems like that the library loader cannot load EBImage.dll because of broken DLL dependencies (such as ImageMagick and GTK+). First, are GTK and ImageMagick working on your machine ? Try 'gtk- demo' and 'display' on the command line. Where ar ...
written 6.6 years ago by Gregoire Pau310
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Comment: C: EBImage Error in .Call("lib_readImages", as.character(files), as.integer(colormo
... Thanks Henrik, Herve for your suggestions. I will use the allocMatrix() method to detect the overflow: casting and multiplying the dimensions using the double type before comparison to INT_MAX. Cheers, Greg --- Gregoire Pau EMBL Research officer http://www.embl.de/~gpau/ On 09/04/2011 02:42, Her ...
written 6.7 years ago by Gregoire Pau310
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Comment: C: EBImage Error in .Call("lib_readImages", as.character(files), as.integer(colormo
... This is right, Henrik. The image is 52703x20688: this is huge and I cannot display it on my computer. This image would take 52703x20688x8 bytes in memory, i.e. about 8 GBytes. I am not sure if R (even the 64-bit version of R) can handle such big objects. Greg --- Gregoire Pau EMBL Research Officer ...
written 6.7 years ago by Gregoire Pau310
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Answer: A: EBImage Error in .Call("lib_readImages", as.character(files), as.integer(colormo
... Hello Vladimir, If ImageMagick is able to read the image, EBImage should be able to do so. Do you have several installed versions of ImageMagick ? To which ImageMagick version EBImage is linked to (try otool or ldd on EBImage.so or EBImage.dll) ? TIFF is a not a file format but a file container wh ...
written 6.7 years ago by Gregoire Pau310
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Comment: C: EBImage: alpha plane in grey scale
... Hello Samuel, Running the following code on my system: > library("EBImage") > a = matrix(runif(20*20), 20, 20) > writeImage(a, "a.tiff") > system("tiffinfo a.tiff") Gives me: Image Width: 20 Image Length: 20 Resolution: 72, 72 pixels/inch Bits/Sample: 16 Compression Scheme ...
written 6.8 years ago by Gregoire Pau310
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Answer: A: EBImage: alpha plane in grey scale
... Hello Samuel, EBImage uses ImageMagick's WriteImage() to write images and doesn't do anything more. Image format is guessed by ImageMagick from the file name and the dynamic range of the image. As an example, the following code creates a random uniform 16-bit grayscale TIFF 20x20 image: > libra ...
written 6.8 years ago by Gregoire Pau310
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Answer: A: Question on displaying color photo as Greyscale in EBImage
... Hello Evan, As mentionned in the EBImage vignette, colorMode() changes the image representation mode but not the image itself. On the contrary, channel() modifies the image. This is documented in ?colorMode. Try: example(colorMode) and example(channel) Hope this helps, Cheers, Greg --- Gregoire ...
written 7.0 years ago by Gregoire Pau310
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Answer: A: : [R] Problems wih EBImage for windows 7
... Hi Evan, Sure. EBImage works fine on Windows. The issue you're mentioning has been fixed in the last release of Bioconductor, in October. Please use the latest release version of EBImage, version 3.6.0, available here: http://www.bioconductor.org/packages/release/bioc/html/EBImage.html If it still ...
written 7.0 years ago by Gregoire Pau310
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EBImage installs but won't load on Mac OS 10.6.4
... Hi Walton, EBImage works fine on 64-bit machines. Permissions cannot explain why R64.app hangs. Did you check if the 64-bit versions of GTK and ImageMagick have been correctly installed ? How did you install them ? What is the result of 'otool -L' on the EBImage.so object ? Cheers, Greg --- Grego ...
go gui process convert ebimage written 7.0 years ago by Gregoire Pau310 • updated 7.0 years ago by W. A. Green40

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