The first thing to do, is to find out is this, if its even made public
what is the maximum resolution supported for an image over dlna on the tv?
The second thing to do, is if you want to skip the first part, or there is no answer to it
is to modify the twonky client xml profile for the tv
in the twonky web interface under sharing and then media receivers
check to see if your tv is detected as "Samsung Smart TV" or as "Samsung TV"
this is where you will need ssh access to the nas
in the following folder, you should see "Samsung_Smart_TV.xml" and "Samsung_TV.xml"
/mnt/HDA_ROOT/twonkymedia/resources/devicedb/Samsung
you will need a text editor, to edit the files
Depending one which one your tv is using, my bet is "Samsung_Smart_TV.xml"
In the xml file you will see this section
the odd thing is that it contains "JPEGORG" which means
offer the client the original jpeg as a choice to display
NOTE: The client picks which one it will play, NOT the server, the server gives only choices
<Scaling>
<Target>JPEG1920x1080</Target>
<Target>JPEG640x480</Target>
<Target>JPEG160x160</Target>
<Target>JPEGORG</Target>
</Scaling>
To find out if the issue is an ordering one try to make look like this
SAVE the file and RESTART the Twonky Server, before Testing
<Scaling>
<Target>JPEGORG</Target>
<Target>JPEG1920x1080</Target>
<Target>JPEG640x480</Target>
<Target>JPEG160x160</Target>
</Scaling>
If the above, doesn't work out, try this
SAVE the file and RESTART the Twonky Server, before Testing
<Scaling>
<Target>JPEGORG</Target>
</Scaling>