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

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 at 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 at gmail.com>
Sent: Thursday, June 11, 2020 5:56:15 PM
To: Wayne Oldford <rwoldford at uwaterloo.ca>
Cc: r-devel at r-project.org <r-devel at 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 at 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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--
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 at cbs.dk  Priv: PDalgd at gmail.com

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

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