Strange behavior concerning pdf-output of externalfigures

Strange behavior concerning pdf-output of externalfigures

[Rudolf Bahr]

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Dear list,

I'm getting unexplainable artefacts in the pdf-output.

My MWE is:

------------------
\starttext

\externalfigure
    [input.png]
    [width=100mm]

\stoptext
------------------

I append the output "MWE.pdf" and the input-figure "input.png" for comparison.

I'm experiencing the artefacts with some figures which are all several years old.
Until now it never happened in conTeXt programs. Because I installed a new OS
(LinuxMint) on my workstation at the same time I tried 3 pdfviewers (okular,
evince, xpdf) all with the same result.

I'm using LuaMetaTeX, Version 2.00.0,
ConTeXt  ver: 2019.04.13 17:25 MKIV beta  fmt: 2019.4.15

Please, do you have any idea what could be the reason?

Best wishes,

Rudolf

[-- Attachment #2: MWE.pdf --]
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[-- Attachment #3: input.png --]
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[-- Attachment #4: Type: text/plain, Size: 493 bytes --]

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Re: Strange behavior concerning pdf-output of externalfigures

[Hans Hagen]

On 4/28/2019 8:10 PM, Rudolf Bahr wrote:
> 
> Dear list,
> 
> I'm getting unexplainable artefacts in the pdf-output.
> 
> My MWE is:
> 
> ------------------
> \starttext
> 
> \externalfigure
>      [input.png]
>      [width=100mm]
> 
> \stoptext
> ------------------
> 
> I append the output "MWE.pdf" and the input-figure "input.png" for comparison.
> 
> I'm experiencing the artefacts with some figures which are all several years old.
> Until now it never happened in conTeXt programs. Because I installed a new OS
> (LinuxMint) on my workstation at the same time I tried 3 pdfviewers (okular,
> evince, xpdf) all with the same result.

different inclusion code

> I'm using LuaMetaTeX, Version 2.00.0,
> ConTeXt  ver: 2019.04.13 17:25 MKIV beta  fmt: 2019.4.15
> 
> Please, do you have any idea what could be the reason?
no problems here .. can you update?

Hans

-----------------------------------------------------------------
                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
        tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
-----------------------------------------------------------------
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Re: Strange behavior concerning pdf-output of externalfigures

[Rudolf Bahr]

On Sun, Apr 28, 2019 at 11:12:43PM +0200, Hans Hagen wrote:
> On 4/28/2019 8:10 PM, Rudolf Bahr wrote:
> > 
> > Dear list,
> > 
> > I'm getting unexplainable artefacts in the pdf-output.
> > 
> > My MWE is:
> > 
> > ------------------
> > \starttext
> > 
> > \externalfigure
> >      [input.png]
> >      [width=100mm]
> > 
> > \stoptext
> > ------------------
> > 
> > I append the output "MWE.pdf" and the input-figure "input.png" for comparison.
> > 
> > I'm experiencing the artefacts with some figures which are all several years old.
> > Until now it never happened in conTeXt programs. Because I installed a new OS
> > (LinuxMint) on my workstation at the same time I tried 3 pdfviewers (okular,
> > evince, xpdf) all with the same result.
> 
> different inclusion code
> 
> > I'm using LuaMetaTeX, Version 2.00.0,
> > ConTeXt  ver: 2019.04.13 17:25 MKIV beta  fmt: 2019.4.15
> > 
> > Please, do you have any idea what could be the reason?
> no problems here .. can you update?
> 
> Hans


Sorry, but even after updating to
ConTeXt  ver: 2019.04.29 09:02 MKIV beta  fmt: 2019.4.29
I'm experiencing the same artefacts as before.

Please, what means "different inclusion code"?

Rudolf
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___________________________________________________________________________________

Re: Strange behavior concerning pdf-output of externalfigures

[Rudolf Bahr]

On Mon, Apr 29, 2019 at 10:52:59AM +0200, Bahr Rudolf wrote:
> On Sun, Apr 28, 2019 at 11:12:43PM +0200, Hans Hagen wrote:
> > On 4/28/2019 8:10 PM, Rudolf Bahr wrote:
> > > 
> > > Dear list,
> > > 
> > > I'm getting unexplainable artefacts in the pdf-output.
> > > 
> > > My MWE is:
> > > 
> > > ------------------
> > > \starttext
> > > 
> > > \externalfigure
> > >      [input.png]
> > >      [width=100mm]
> > > 
> > > \stoptext
> > > ------------------
> > > 
> > > I append the output "MWE.pdf" and the input-figure "input.png" for comparison.
> > > 
> > > I'm experiencing the artefacts with some figures which are all several years old.
> > > Until now it never happened in conTeXt programs. Because I installed a new OS
> > > (LinuxMint) on my workstation at the same time I tried 3 pdfviewers (okular,
> > > evince, xpdf) all with the same result.
> > 
> > different inclusion code
> > 
> > > I'm using LuaMetaTeX, Version 2.00.0,
> > > ConTeXt  ver: 2019.04.13 17:25 MKIV beta  fmt: 2019.4.15
> > > 
> > > Please, do you have any idea what could be the reason?
> > no problems here .. can you update?
> > 
> > Hans
> 
> 
> Sorry, but even after updating to
> ConTeXt  ver: 2019.04.29 09:02 MKIV beta  fmt: 2019.4.29
> I'm experiencing the same artefacts as before.
> 
> Please, what means "different inclusion code"?
> 


Interesting news!
After having changed the png-Format of the external figure to ".tiff"-Format by
gimp2.10 the artefacts have gone!

Rudolf
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Re: Strange behavior concerning pdf-output of externalfigures

[Hans Hagen]

On 4/29/2019 10:52 AM, Rudolf Bahr wrote:

> Sorry, but even after updating to
> ConTeXt  ver: 2019.04.29 09:02 MKIV beta  fmt: 2019.4.29
> I'm experiencing the same artefacts as before.
> 
> Please, what means "different inclusion code"?
all in lua

anyway, as the png test suite passes ok the question is what makes your 
image different ... here it looks ok when included on windows64 bit and 
linux 64 bit

 >gm identify input.png
input.png PNG 334x168+0+0 DirectClass 8-bit 29.6Ki 0.000u 0m:0.000000s
gm identify: iCCP: CRC error (input.png).

maybe a bad image?

Hans

-----------------------------------------------------------------
                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
        tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
-----------------------------------------------------------------
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
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___________________________________________________________________________________

Re: Strange behavior concerning pdf-output of externalfigures

[Rudolf Bahr]

On Mon, Apr 29, 2019 at 01:18:04PM +0200, Hans Hagen wrote:
> On 4/29/2019 10:52 AM, Rudolf Bahr wrote:
> 
> > Sorry, but even after updating to
> > ConTeXt  ver: 2019.04.29 09:02 MKIV beta  fmt: 2019.4.29
> > I'm experiencing the same artefacts as before.
> > 
> > Please, what means "different inclusion code"?
> all in lua
> 
> anyway, as the png test suite passes ok the question is what makes your
> image different ... here it looks ok when included on windows64 bit and
> linux 64 bit
> 
> >gm identify input.png
> input.png PNG 334x168+0+0 DirectClass 8-bit 29.6Ki 0.000u 0m:0.000000s
> gm identify: iCCP: CRC error (input.png).
> 
> maybe a bad image?


Perhaps. Or generated by older software. Though my GraphicsMagick (1.3.28):
"gm identify input.png" doesn't tell me anything about a "CRC error":
input.png PNG 334x168+0+0 DirectClass 8-bit 29.6Ki 0.000u 0m:0.000003s

Anyway, at the beginning of a new book there are 10 of such images with artefacts.
I can handle the problem by converting them to .tiff-pictures. As long as I shall
have enough storage in my host :-), for me all will be ok.

Thank you!

Rudolf
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Re: Strange behavior concerning pdf-output of externalfigures

[Alan Braslau]

On Mon, 29 Apr 2019 13:18:04 +0200
Hans Hagen <j.hagen@xs4all.nl> wrote:

> anyway, as the png test suite passes ok the question is what makes your 
> image different ... here it looks ok when included on windows64 bit and 
> linux 64 bit

Your very own .png image and MWE works fine here on OSX, freeBSD, and linux.

Alan
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Re: Strange behavior concerning pdf-output of externalfigures

[Rudolf Bahr]

On Mon, Apr 29, 2019 at 04:32:07PM -0600, Alan Braslau wrote:
> On Mon, 29 Apr 2019 13:18:04 +0200
> Hans Hagen <j.hagen@xs4all.nl> wrote:
> 
> > anyway, as the png test suite passes ok the question is what makes your 
> > image different ... here it looks ok when included on windows64 bit and 
> > linux 64 bit
> 
> Your very own .png image and MWE works fine here on OSX, freeBSD, and linux.
> 
> Alan
> 


Thank you, Alan! I converted this image and its comrades which showed artefacts to
.tiff-images and so they all work at their very best.

My conTeXt-version is:
This is LuaMetaTeX, Version 2.00.0
ConTeXt  ver: 2019.04.29 09:02 MKIV beta  fmt: 2019.4.29

But the .log-file contains following strange lines:

[...]
luatex warning  > pdfe: ?
luatex warning  > pdfe: ?
luatex warning  > pdfe: ?
luatex warning  > pdfe: ?
luatex warning  > pdfe: ?
luatex warning  > pdfe: ?
pages           > flushing realpage 2, userpage 2, subpage 2
luatex warning  > pdfe: ?
luatex warning  > pdfe: ?
luatex warning  > pdfe: ?
pages           > flushing realpage 3, userpage 3, subpage 3
[...]

There are 6 such .tiff-images on page 2 (without any other images) and 3 on page 3.
On page 3 there are 5 other .png-images without any problems. I don't know what "pdfe"
means. The 9 .tiff-images are few years older than the .png-images on page 3. This
means they have been generated in a slightly other way than the newer .png-files
on page 3, for instance by an older context-mkiv and GIMP 2.8 on debian 8 (Jessie) or
later debian 9 (Stretch), wheras now I'm using context-lmtx on LinuxMint and GIMP2.10.

But, as I pointed out, this .tiff-workaround is ok for me, because the artefact effect
seems to be limited to those images on page 2 and 3 in my new book. Strange is, that
the artefacts (with the same images which haven't been changed in any way) didn't crop
up with older context-mkiv.

Rudolf
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Re: Strange behavior concerning pdf-output of externalfigures

[Rudolf Bahr]

The problem with artefacts in .png images is still unsolved for me.
I can circumvent it by using .jpg or .tiff images instead of .png images
as long as no transparent areas in the images are needed. As far as I know
.jpg and .tiff formats cannot handle transparancy, do they?

Now in .log files messages like
"luatex warning  > pdfe: invalid 11 0 R object at offset 223611"
can be seen. Please, what do they mean?

Rudolf

PS.:
LinuxMint 64bit

This is LuaMetaTeX, Version 2.00.0 
open source     > level 1, order 1, name 'cont-yes.mkiv'
system          > 
system          > ConTeXt  ver: 2019.05.12 19:40 MKIV beta  fmt: 2019.5.14  int: english/english

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Re: Strange behavior concerning pdf-output of externalfigures

[Hans Hagen]

On 5/16/2019 12:21 PM, Rudolf Bahr wrote:
> The problem with artefacts in .png images is still unsolved for me.
> I can circumvent it by using .jpg or .tiff images instead of .png images
> as long as no transparent areas in the images are needed. As far as I know
> .jpg and .tiff formats cannot handle transparancy, do they?
> 
> Now in .log files messages like
> "luatex warning  > pdfe: invalid 11 0 R object at offset 223611"
> can be seen. Please, what do they mean?
Does that come from an pdf generated by image magick>? If so, the 
problem is there ... the last years I've seen lots of converted files 
with bogus pdf objects. (Kind of harmless but still.)

Hans


-----------------------------------------------------------------
                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
        tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
-----------------------------------------------------------------
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