I guess my point was to post the same images at the same size from both hosting locations.


Here's a side-by-side; I linked the Medium 500 image from Flickr (left), and I also downloaded the Medium 500 image to my computer and uploaded it to TDP (right):



Flickr-hosted: <span style="white-space: pre;"] TDP-hosted:
[img]/cfs-file.ashx/__key/CommunityServer-Discussions-Components-Files/13/7801.Resize-test.jpg[/img]


I don't see any difference. So just hosting images here isn't a problem.


Now I'll try letting the TDP site do the downsampling - same Medium 500 image for a side-by-side, the one on the right is a download of the 1066x1600 image from Flickr, which I uploaded to TDP (Insert Image, From Computer tab, with 333 in the Max Width field):



Flickr-hosted (same as above): <span style="white-space: pre;"] TDP-hosted (download of larger Flickr image, 333 in the max width):
[img]/resized-image.ashx/__size/333x0/__key/CommunityServer-Discussions-Components-Files/13/3583.Resize-Test-2.jpg[/img]


The image that was down-sampled by the TDP site lost quite a bit of sharpness and contrast.


So, the moral of the story is pick the size you want for your TDP-hosted images before you upload them, and delete the default value in the Max Width field (leave it blank) so the site doesn't downsize your image. It's not uploading to TDP per se that is the problem, it's letting the TDP site downsize your image that degrades the quality.