Image quality in shared photostream

Hello,
I started to use iCloud photo library which works fine and I have all the photos in iCloud in original quality (at least at seems like so to me).
But when I start a shared photostream and put the photos there and I open it on my Mac in new app Photo, what quality do have these images?
The reason I am asking it is because I take many pictures and chosen one I store to shared photostream. And time from time I would like to save them to my HDD and store them in original quality.
Thank you for clearing this question.

Really nobody?

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I seems there is a significant reduction in image quality when editing images in iPhoto 2 (iOS7) on an iPad Air.
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Hey
I want to start a shared photostream. what can you say about the quality of photos, are they compressed or will the resolution change?
I need the photos in original quality on the invited devices. Read that only the My Photostream photos but not the shared ones habe the same quality like original

Hi albummi,
The image resolution used by Shared Photo Streams varies depending on the particular device, as detailed below:
Which photo formats and sizes are supported in Shared Photo Streams?
Shared Photo Streams supports JPEG, TIFF, PNG, and most RAW photo formats. On your Mac or PC, your photos are downloaded and stored in full resolution. On your iPhone, iPad, iPod touch, and Apple TV, your Photo Stream photos are delivered in a device-optimized resolution that speeds downloads and saves storage space. While actual dimensions will vary, an optimized version of a photo taken by a standard point-and-shoot camera will have a 2048 x 1536 pixel resolution when pushed to your devices. Panoramic photos can be up to 5400 pixels wide.
iCloud: Shared Photo Streams FAQ
Regards,
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I have a Sony HDR-HC9 1080i HDV tape camcorder and I am able to play back HD video to either a Mac computer or to a Panasonic Full HD 1080p TV. Playback quality of unedited HD holiday video footage to TV using HDMI cable and to the computer via Firewire is superb. This excellent playback quality is also preserved in an edited iMovie Project in HDV format 57 minutes long and 48 GB in size which I made from the original 90 minutes holiday video footage.
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Steve, Bill, John, thanks for your prompt replies.
Steve, I took your advice and used the Flip Mino and changed the frame size to 720x400. I then used the MP4 - H.264 1440x1080p 30, modified again to 720x400 to produce the output. And the result? I can't tell the original file from the output file, except for the audio, that is a bit lower in volume and actually sligtly more pleasant to listen to.
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Before I used a modified HDV project setting: These and the Flip project settings seem to be mostly the same except that they use different editing modes, so I guess this is the reason why the Flip works so much better?
In any case, thank you all for the help!
K0ICHI

Image quality in shared photostream

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