# [texworks] JPEG rendering problem

Alain Delmotte esperanto at swing.be
Tue Jan 27 14:42:20 CET 2009

Hi!

I retested with the different versions I have (working under Windows XP):
r132, r161 and r238 give a ping background for the images in the preview,
r252 (which I compiled following the instructions of Stefan) doesn't.

*But* the background is only for .jpeg images, a .png will not have the
background in the different releases.

This background appears only within TeXworks and not in a viewer (Adobe
Reader, PDFXChange tested) as it shouldn't because the picture has no
background (well perhaps a white one for the graph).
In my point of view there should not be a background, unless one finds
some use (size of the area used by the picture?) for it in developing a
document.

Herb Sculz:
> Hmmmm... Opening the pdf file produced by compiling the test file shows
> Black and the correct background color in both Preview (& TeXShop) and
> Adobe Reader. But it shows the distorted colors in TeXWorks (last
released binary).

What is the "correct background"?
I think the background should be white or none (the paper behind); the
picture files themself do not have a background colour and there are no
instructions to get a background in the file received:
\begin{document}

\centering

\includegraphics[width=5cm]{lines-part} \\[\bigskipamount]

\includegraphics[width=10cm]{D62A60Z144}

\end{document}

Alain

Jonathan Kew a écrit :
> I believe this is an issue of the poppler library version; the problem
> exists with the version in the "libraries" download but has been fixed
> in more recent poppler source. So a library update is needed.
>
> JK
>
> On 26 Jan 2009, at 17:47, Herbert Schulz wrote:
>
>>
>> On Jan 26, 2009, at 10:44 AM, Alain Delmotte wrote:
>>
>>> Hi,
>>>
>>> Testing with the files in the archive it is normal to get the
>>> TeXworks result.
>>> I got exactly the same under Windows with r252.
>>> In fact the two pictures you sent have the colours seen with
>>> TeXworks; the TeXshop result is apparently not created with the sent
>>> .jpeg files.
>>> Try to open the .jpeg files with a viewer.
>>>
>>> Alain
>>>
>>
>>
>> Howdy,
>>
>> Hmmmm... Opening the pdf file produced by compiling the test file
>> shows Black and the correct background color in both Preview (&
>> TeXShop) and Adobe Reader. But it shows the distorted colors in
>> TeXWorks (last released binary).
>>
>> Good Luck,
>>
>> Herb Schulz
>> (herbs at wideopenwest dot com)
>>
>>
>>
>
>