Jeremias Maerki-2 wrote:
>
> On 28.08.2008 17:41:07 SwissUser wrote:
>>
>> Hi there
>>
>> I am having problems using FOP 0.95 (with JDK 1.4 on Windows) with some
>> specific JPEGs from a customer (one of which is attached below)
>>
>> http://www.nabble.com/file/p19203276/wpv_image2.jpg
>>
>> I have a few questions for the FOP community.
>>
>> 1. where can I find out what JPEG formats (colour tables etc) are
>> supported
>> (the help only states - unusual color lookup tables and color
>> profiles............etc)
>> so that I can inform my users what is possible and not.
>
> To document something like that to every possible detail is a lot of
> work and is like to get out of sync with the code very quickly. Provided
> this is possible at all since there are so many sub-formats and variants
> in the image world. Of course, users can always help us gather
> information by adding such information on the Wiki or sending patches
> for our website sources.
>
>> 2. Can anyone tell me from the image attached - what is wrong with it,
>> how
>> has it been saved/compressed etc such that it no longer works with FOP
>> (saving it with other programs or formats seems to solve the problem)
>
> The JPEG uses SOF1 (Extended Sequential DCT). I've never been able to
> produce such a JPEG file and thus was never able to test with it. It
> looks like the loading stage is not fine enough to handle a JPEG that does
> not use baseline format. It has to be refined so more exotic JPEGs like
> yours get decoded by a JPEG codec. Right now, the code tries to embed
> the JPEG in the PDF without decoding it (to improve speed and lower
> memory consumption), but PDF doesn't support extended sequential DCT.
>
> Would you please add a Bugzilla entry (for product: Apache XML Graphics
> Commons) and attach your JPEG file to the issue? Thanks.
>
>> 3. does anyone know, if this format is determinable, when/if it will be
>> supported, or who I can resolve this issue.
>
> "When" is a question that you'll rarely get an answer for in a
> volunteer-driven project. Some changes are necessary in the image
> loading framework in Apache XML Graphics Commons so the code falls back
> to loading/decoding the image using a codec.
>
> The work-around is to convert the image to a different format (or even
> JPEG again if you manage to avoid extended sequential DCT format).
>
>> Thanks
>>
>> Ashley
>> --
>> View this message in context:
>> http://www.nabble.com/JPEG-problem---FOP-0.95-tp19203276p19203276.html
>> Sent from the FOP - Users mailing list archive at Nabble.com.
>>
>>
>
>
> Jeremias Maerki
>
>
Hi Jeremias
THanks for the fast and informative reply, much appreciated
ashley
--
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