From j|ox @end|ng |rom mcm@@ter@c@  Fri Jun 12 04:49:36 2020
From: j|ox @end|ng |rom mcm@@ter@c@ (Fox, John)
Date: Fri, 12 Jun 2020 02:49:36 +0000
Subject: [Rd] 
 tcltk image reading problem (on a mac?): [tcl] encountered an
 unsupported criticial chunk type "eXIf"
In-Reply-To: <AE3CE86B-5591-4794-8687-3CFC9E1F97EB@R-project.org>
References: <FEAE9DA5-8206-4025-BA52-790717E27455@contoso.com>
 <274D88FD-B4E7-40E4-9814-24C5B70F858D@gmail.com>
 <22794_1591915402_05BMhLe6010602_BN8PR05MB6321E2E5C596C22180D6E1C7FC800@BN8PR05MB6321.namprd05.prod.outlook.com>
 <E574B396-3A22-4749-89DA-9027389AC78F@mcmaster.ca>
 <41413BD1-966E-4454-B674-AB58EC4786C0@uwaterloo.ca>
 <AE3CE86B-5591-4794-8687-3CFC9E1F97EB@R-project.org>
Message-ID: <52B0A0EF-3BF4-4010-B21A-CD85B0C4B33E@mcmaster.ca>

Dear Simon,

> On Jun 11, 2020, at 9:00 PM, Simon Urbanek <simon.urbanek at 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.

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)

Best,
 John


> 
> Thanks,
> Simon
> 
> 
>> On 12/06/2020, at 12:24 PM, Wayne Oldford <rwoldford at 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 at mcmaster.ca>
>> Date: Thursday, June 11, 2020 at 7:54 PM
>> To: Wayne Oldford <rwoldford at uwaterloo.ca>
>> Cc: Peter Dalgaard <pdalgd at gmail.com>, "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"
>> 
>>   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
>>>> 
>>>> ___________________________________________________
>>>> 
>>>> 
>>>>     [[alternative HTML version deleted]]
>>>> 
>>>> ______________________________________________
>>>> R-devel at 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 at cbs.dk  Priv: PDalgd at gmail.com
>>> 
>>> 
>>> 
>>> 
>>> 
>>> 
>>> 
>>> 
>>> 
>>> 
>>> 	[[alternative HTML version deleted]]
>>> 
>>> ______________________________________________
>>> R-devel at r-project.org mailing list
>>> https://stat.ethz.ch/mailman/listinfo/r-devel
>> 
>> 
>> 
>> 
>> 
>> ______________________________________________
>> R-devel at r-project.org mailing list
>> https://stat.ethz.ch/mailman/listinfo/r-devel
> 



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