Hello David,
In short, the recommended upload, for now is 1024. Any images biger than 800 pixels, will have an Xlarge size which will be viewed in full screen.
Now, the long explanations ::
when I designed the uploader, I set the limit to 15 MB, but this is the bigger picture:::
1_On this site we are going to put a lot of emphasis on image display and quality. As you know, each time you downsize an image,
You lose some contrast and sharpness. the bigger the downsize, the bigger the loss(I know my good friend, Stephen, Claypaws will disagree with me for the way I am explainig this, but I think this is easier to follow) Sites usually sharpen images when they downsize. Also, as you know, there is no one formula for sharpening all images. different images need different sharpening settings. so, keep that in mind and also this fact::
All those image download prevention offered here and some other sites, are truly nonsense. They will ONLY keep grandma and grandpa from downloading them for personal pleasure. most everyone knows how to take a screen shot and many can go in the "Source code" of a page and get the direct URL to to the image and download. Besides, more motivated people, can easily access the server location for images and download all or any they like. there are even applications for this.
So,,,
This is what I have temporarily decided to do . We recommend uploading of 1024 pixels images and processed the way you like.
We will show that Full screen, untouched, in Xlarge option. For the rest of the smaller sizes, we sharpen as we downsize.
(thank you Stephen for woding this formula out with me) NOW,, if you upload an image lets say, 4000 pixels, we will downsize and keep an original of 1024, untouched and discard the 4000 pixels. A LITTLE LATER,, WE WILL ONLY KEEP THE ORIGINAL OF THE IMAGES WHICH ARE MARK FOR "PRINT AVAILABLE" and we keep the original in a special secured location, ONLY accessible by the printers.
Printers and the print facilities and employees, are also known to sometimes, breach the copyright policies and take advantage of the files available to them. SO, for this and other purposes, we have also created the "Home Store". Here, members can sell anything,including prints and gifts which they themselves make and available.
SO, for now, I would recommend uploading 1024, and processed as you wish.

I guess I am a dummy, but most of the discussion here has simply confused me. Should I be downloading picturesat 72mp or 300mp? Should I download images for WEB display, or normally at 300mp? I have noticed that many of my shots are undersaturated when they appear at MegaShot.... so what happens is that I now over-saturate some shots in order to have them appear on MegaShot as they appear to me in my Photoshop program.
As to the matter of contests and Explore, I remain in the dark and am terribly confused. Often I cannot find a shot in Explore after I have sent it there. As for contests, I rarely have any idea as to whether a contest on the drop-down list is open or closed.... unless I see a notice on Facebook. I would prefer to come here for informtion rather than seeing it on Facebook, as it is here that I am sending my photos.
