Just trying the Photo Testing site:
The first was imgur, this one is flickr:
IMG_4571 by Paul Ahrens, on Flickr
Posting the forst photo again, except from flcikr. The imgur version shows incorrect cross-hatching and I want to see if flickr avoids that.
IMG_4492 by Paul Ahrens, on Flickr
Above has some cross-hatch effect also. Trying here the flickr option again, but this time choosing the Large 2048x1536 (vs.Large 1024x768 option used above).
IMG_4492 by Paul Ahrens, on Flickr
OK, now try flickr Medium 640x480
IMG_4492 by Paul Ahrens, on Flickr
Well, copying the BBCode the Medium works better! Nil ill effects created.