[Rd] readPNG gives warnings and doesn't execute sample code from help files

Joris Meys jorismeys at gmail.com
Mon Feb 14 16:05:40 CET 2011

Dear all,

I noticed in the latest R version (R.2.12.1) that the readPNG gives
following warning when running the example code in the help file (or
when using any other png for that matter) :

50: In rasterImage(img, 1.2, 1.27, 1.8, 1.73) :
  Per-pixel alpha not supported on this device

No picture is shown, and code I used to be able to run, doesn't run any more.

> sessionInfo()
R version 2.12.1 (2010-12-16)
Platform: i386-pc-mingw32/i386 (32-bit)

[1] LC_COLLATE=English_United States.1252  LC_CTYPE=English_United
States.1252    LC_MONETARY=English_United States.1252
[4] LC_NUMERIC=C                           LC_TIME=English_United

attached base packages:
[1] grDevices datasets  splines   graphics  stats     tcltk     utils
   methods   base

other attached packages:
[1] png_0.1-2       svSocket_0.9-51 TinnR_1.0.3     R2HTML_2.2
Hmisc_3.8-3     survival_2.36-2

loaded via a namespace (and not attached):
[1] cluster_1.13.2  grid_2.12.1     lattice_0.19-13 svMisc_0.9-61

Joris Meys
Statistical consultant

Ghent University
Faculty of Bioscience Engineering
Department of Applied mathematics, biometrics and process control

tel : +32 9 264 59 87
Joris.Meys at Ugent.be
Disclaimer : http://helpdesk.ugent.be/e-maildisclaimer.php

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