[Rd] tcltk image reading problem (on a mac?): [tcl] encountered an unsupported criticial chunk type "eXIf"
Simon Urbanek
@|mon@urb@nek @end|ng |rom R-project@org
Fri Jun 12 03:14:53 CEST 2020
Some googling suggests that this is an issue in tcltk which doesn't support png files with Exif tags. Are you sure this ever worked? This doesn't seem to be related to the macOS version since it's a feature tcltk, not the system.
I had no issue using the png package, so you could simply remove any offending chunks with
writePNG("test.png",readPNG("exIf.png", TRUE,TRUE))
then the output work with tcltk.
Cheers,
Simon
> On 12/06/2020, at 1:00 PM, Simon Urbanek <simon.urbanek using r-project.org> 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.
>
> Thanks,
> Simon
>
>
>> On 12/06/2020, at 12:24 PM, Wayne Oldford <rwoldford using uwaterloo.ca> wrote:
>>
>> 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" <jfox using mcmaster.ca>
>> Date: Thursday, June 11, 2020 at 7:54 PM
>> To: Wayne Oldford <rwoldford using uwaterloo.ca>
>> Cc: Peter Dalgaard <pdalgd using gmail.com>, "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"
>>
>> 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
>>>>
>>>> ___________________________________________________
>>>>
>>>>
>>>> [[alternative HTML version deleted]]
>>>>
>>>> ______________________________________________
>>>> 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
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>> [[alternative HTML version deleted]]
>>>
>>> ______________________________________________
>>> R-devel using r-project.org mailing list
>>> https://stat.ethz.ch/mailman/listinfo/r-devel
>>
>>
>>
>>
>>
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