[Rd] tcltk image reading problem (on a mac?): [tcl] encountered an unsupported criticial chunk type "eXIf"

[Fox, John]

Dear Wayne and Peter,

FWIW, I observe exactly the same problem in Catalina. The error and my session info:

-------- snip --------

> tkimage.create("photo", file = fname)
Error in structure(.External(.C_dotTclObjv, objv), class = "tclObj") : 
  [tcl] encountered an unsupported criticial chunk type "eXIf".

> sessionInfo()
R version 4.0.0 (2020-04-24)
Platform: x86_64-apple-darwin17.0 (64-bit)
Running under: macOS Catalina 10.15.5

Matrix products: default
BLAS:   /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libBLAS.dylib
LAPACK: /Library/Frameworks/R.framework/Versions/4.0/Resources/lib/libRlapack.dylib

locale:
[1] en_CA.UTF-8/en_CA.UTF-8/en_CA.UTF-8/C/en_CA.UTF-8/en_CA.UTF-8

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

loaded via a namespace (and not attached):
[1] compiler_4.0.0 tools_4.0.0   

-------- snip --------

This is from RStudio but I see the same thing in the R.app.

I hope this is of some help,
 John

 -----------------------------
  John Fox, Professor Emeritus
  McMaster University
  Hamilton, Ontario, Canada
  Web: http::/socserv.mcmaster.ca/jfox

> On Jun 11, 2020, at 6:43 PM, Wayne Oldford <rwoldford using uwaterloo.ca> wrote:
> 
> Yes.
> I seem to be picking up
> <Tcl>  8.6
> I should have noted that.
> 
> Use to work for me too in Mojave.
> I have the sneaky feeling that Catalina is the problem.
> 
> R. W. Oldford
> 
> https://math.uwaterloo.ca/~rwoldfor
> 
> ________________________________
> From: Peter Dalgaard <pdalgd using gmail.com>
> Sent: Thursday, June 11, 2020 5:56:15 PM
> To: Wayne Oldford <rwoldford using uwaterloo.ca>
> Cc: r-devel using r-project.org <r-devel using r-project.org>
> Subject: Re: [Rd] tcltk image reading problem (on a mac?): [tcl] encountered an unsupported criticial chunk type "eXIf"
> 
> Happy enough for me on Mojave.
> 
> On the off chance that you are picking up an old Tcl, do you see this?
> 
>> tcl("info","tclversion")
> <Tcl> 8.6
> 
> 
> -pd
> 
>> On 11 Jun 2020, at 23:04 , Wayne Oldford <rwoldford using uwaterloo.ca> wrote:
>> 
>> Hello everyone
>> 
>> I am not sure when this appeared
>> (sometime post R 3.5.0 and after I switched to Mac OS Catalina).
>> 
>> I do not think it happens on all platforms (e.g. seems to work on windows).
>> 
>> But it seems that
>> 
>>     tkimage.create()
>> 
>> no longer works on a Mac for all png files.
>> 
>> 
>> (It does work for *some* old png files I have on disk but I have not been able to determine what is different about the ones that work)
>> 
>> Any help would be appreciated.
>> 
>> - Wayne
>> 
>> 
>> R.W. Oldford
>> math.uwaterloo.ca/~rwoldfor
>> 
>> 
>> 
>> 
>>> library(tcltk)
>> 
>>> fname <- "Rplot.png"
>>> png(filename = fname, width = 500, height = 500)
>>> hist(rnorm(20))
>>> dev.off()
>> 
>>> tkimage.create("photo", file = fname)
>> 
>> Error in structure(.External(.C_dotTclObjv, objv), class = "tclObj") :
>> [tcl] encountered an unsupported criticial chunk type "eXIf".
>> 
>> 
>> ______________________________
>> 
>>> R.version
>>              _
>> platform       x86_64-apple-darwin17.0
>> arch           x86_64
>> os             darwin17.0
>> system         x86_64, darwin17.0
>> status
>> major          4
>> minor          0.0
>> year           2020
>> month          04
>> day            24
>> svn rev        78286
>> language       R
>> version.string R version 4.0.0 (2020-04-24)
>> nickname       Arbor Day
>> 
>> ___________________________
>> 
>> macOS Catalina V 10.15.5
>> 
>> ___________________________________________________
>> 
>> 
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>> 
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>> R-devel using r-project.org mailing list
>> https://stat.ethz.ch/mailman/listinfo/r-devel
> 
> --
> Peter Dalgaard, Professor,
> Center for Statistics, Copenhagen Business School
> Solbjerg Plads 3, 2000 Frederiksberg, Denmark
> Phone: (+45)38153501
> Office: A 4.23
> Email: pd.mes using cbs.dk  Priv: PDalgd using gmail.com
> 
> 
> 
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> 
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> 
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