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From Charles Matthew Chen <>
Subject Re: Saving images in Sanselan
Date Thu, 09 Jul 2009 03:28:28 GMT
   Glad to hear it, Jonathan, but strictly speaking it shouldn't be necessary.


On Wed, Jul 8, 2009 at 11:03 PM, Jonathan
Giles<> wrote:
> Charles,
> I was actually trying precisely this - I dropped down to using byte[] rather
> than streams, and that resolved my issue.
> Thanks! :-)
> Jonathan
> Charles Matthew Chen wrote:
>> Hi Jonathan,
>>   You can definitely use Sanselan to modify an image's metadata.  I'm
>> not quite sure I understand exactly what problem you are seeing.
>>   I would suggest you a) read the image entirely into memory as a
>> byte array. b) modify it's metadata with sanselan and write the output
>> to a byte array in memory c) write the byte array to a file/over your
>> network connection.  Looking at the size of the intermediate values
>> should help you isolate whether the problem lies.
>>   It would also be helpful to know: what image format the images are
>> in?  Are the output images valid or corrupt?
>>   Normally, I would recommend that you open an issue and attach
>> code/images that reproduce the problem so that we can take a look.
>> However, our project is the course of a transition: we're being
>> assimilated into the Commons project.  I'm not quite sure when/if/how
>> our issues will be migrated, nor what issue tracking system the
>> Commons project uses.
>>   Why don't you open an issue in Jira despite the transition -
>> perhaps we can resolve your issue before it is decommissioned.
>> Matthew
>> On Wed, Jul 8, 2009 at 8:04 PM, Jonathan Giles<> wrote:
>>> Hi everyone,
>>> To get to the crux of my issue: I want to be able to read/write jpeg
>>> images
>>> with metadata over a network connection. To do this I read/write
>>> input/outputstreams.
>>> I've tried a few different ways, but no matter how I do it, the file that
>>> is
>>> output is considerably smaller in filesize than when it went in.
>>> Is there a means through which I can get a stream of the complete image,
>>> modify the metadata, and then write this to file? At present I can't see
>>> any
>>> option for this.
>>> Please help - this is the final roadblock in my project!
>>> Cheers,
>>> Jonathan Giles
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