[Rd] tcltk image reading problem (on a mac?): [tcl] encountered an unsupported criticial chunk type "eXIf"
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
day24
svn rev78286
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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Re: [Rd] tcltk image reading problem (on a mac?): [tcl] encountered an unsupported criticial chunk type "eXIf"
Yes.
I seem to be picking up
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
Sent: Thursday, June 11, 2020 5:56:15 PM
To: Wayne Oldford
Cc: r-devel@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")
8.6
-pd
> On 11 Jun 2020, at 23:04 , Wayne Oldford 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
> day24
> svn rev78286
> language R
> version.string R version 4.0.0 (2020-04-24)
> nickname Arbor Day
>
> ___
>
> macOS Catalina V 10.15.5
>
> ___
>
>
>[[alternative HTML version deleted]]
>
> __
> R-devel@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@cbs.dk Priv: pda...@gmail.com
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Re: [Rd] tcltk image reading problem (on a mac?): [tcl] encountered an unsupported criticial chunk type "eXIf"
I don't know what has changed with Catalina
But I just tried my tk console from the shell command tkcon
And got the following error.
Here is my shell:
$ tkcon
dyld: Library not loaded: /usr/local/lib:/opt/X11/lib/libtk8.6.dylib
Referenced from: /usr/local/bin/wish
Reason: image not found
Abort trap: 6
I don't know whether this is a red herring or not, but the
Console fails to boot.
John does it work for you?
Not sure whether Python has the same trouble. Kind of old info at
https://www.python.org/download/mac/tcltk/
-Original Message-
From: "Fox, John"
Date: Thursday, June 11, 2020 at 7:54 PM
To: Wayne Oldford
Cc: Peter Dalgaard , "r-devel@r-project.org"
Subject: Re: [Rd] 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 wrote:
>
> Yes.
> I seem to be picking up
> 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
> Sent: Thursday, June 11, 2020 5:56:15 PM
> To: Wayne Oldford
> Cc: r-devel@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")
> 8.6
>
>
> -pd
>
>> On 11 Jun 2020, at 23:04 , Wayne Oldford 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
Re: [Rd] tcltk image reading problem (on a mac?): [tcl] encountered an unsupported criticial chunk type "eXIf"
Thanks everyone for getting a solution.
Brian's solution works for me too.
Thanks again!!
Wayne
-Original Message-
From: Prof Brian Ripley
Date: Friday, June 12, 2020 at 3:00 AM
To: "Fox, John" , Simon Urbanek
Cc: Wayne Oldford , "r-devel@r-project.org"
Subject: Re: [Rd] tcltk image reading problem (on a mac?): [tcl] encountered an
unsupported criticial chunk type "eXIf"
On 12/06/2020 03:49, Fox, John wrote:
> Dear Simon,
>
>> On Jun 11, 2020, at 9:00 PM, Simon Urbanek
wrote:
>>
>> Wayne,
>>
>> that one is unrelated, but interesting - you can fix it with
>>
>> sudo install_name_tool -change \
>> /usr/local/lib:/opt/X11/lib/libtk8.6.dylib \
>> /usr/local/lib/libtk8.6.dylib \
>> /usr/local/bin/wish8.6
>>
>> There is a bug in tcltk with IDs on the libraries which I have
worked-around for R, but not for wish.
>>
>> Back to the original question - do you have any example of a file that
doesn't work so I could test? Exif chunks are fairly rare in PNG and are a more
late extension so I couldn't find any examples.
>
> The code in Wayne's original message (copied below) generated the
offending file:
>
> library(tcltk)
>
> fname <- "Rplot.png"
> png(filename = fname, width = 500, height = 500)
> hist(rnorm(20))
> dev.off()
>
> tkimage.create("photo", file = fname)
There are several png() devices for R. The default on macOS is to use
Quartz, and that depends on macOS system functions so might well have
changed with Mojave -> Catalina.
As a workaround, try e.g. png(type='cairo'). E.g.
fname <- file.path(tempdir(), "Rplot.png")
png(filename = fname, width = 500, height = 500, type="cairo")
hist(rnorm(20))
dev.off()
library(tcltk)
tkimage.create("photo", file = fname)
works for me on Catalina.
--
Brian D. Ripley, rip...@stats.ox.ac.uk
Emeritus Professor of Applied Statistics, University of Oxford
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