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Is it possible to add visible/invisible watermark to photos already uploaded to Picasa Web/500px/Flickr?

Do they preserve EXIF(metadata) of the image?

I am looking for free tools/services. If downloading software is required, I would prefer Linux/Ubuntu.

Update: In the light of two answers already given; adding a clarification. A solution that lets adding the watermark without downloading the photos from the respective locations is asked for.

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Downvoting without comment isn't helpful just rude –  user9817 Aug 20 '12 at 8:27
    
@ClaraOnager Sorry I don't get you. I can't even upvote!! –  Noble P. Abraham Aug 20 '12 at 11:30
    
Not you, someone else downvoted for no apparent reason –  user9817 Aug 20 '12 at 12:51
    
@ClaraOnager Ok, thank you –  Noble P. Abraham Aug 20 '12 at 12:54
    
What are you trying to do here? I have to admit, I can see why it was down voted as the question, given the way it was worded, would imply a less-than-savoury need here. –  John Cavan Aug 21 '12 at 3:09

3 Answers 3

up vote 2 down vote accepted

Ok. I am not sure what you are asking, but I can try to guess.

If a photo is already uploaded, it is rather difficult to modify, as that copy is no longer on your computer.

I suggest downloading the photo, applying the watermark in photoshop/gimp (A free, open source version of photoshop), and re-uploading. I am not sure if this will preserve the metadata though.

As to how to apply a watermark in gimp, that is another question entirely.

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@Stephan Thanks, I am looking for a solution that might let me do it without downloading them. –  Noble P. Abraham Aug 24 '12 at 16:05
    
I am accepting your answer, as there may not be a better answer than this one. –  Noble P. Abraham Aug 28 '12 at 16:25

There is a software called Mass Watermark which can watermark Images and Upload them directly to your Picasa/Flickr Web-albums.Since you have already uploaded the photos i recommend downloading them again and using the software.Download the software from http://www.masswatermark.com

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Thanks, I am looking for a solution that might let me do it without downloading them. –  Noble P. Abraham Aug 25 '12 at 8:39

I will provide all who visit this page with a working answer, having in mind that this is now 2015:

Of course you can have you images uploaded to a Google+ album and still have you originals on your computer. Supposing you have uploaded the images with Picasa 3 and you still have the connection in Picasa with both the local and online album.

What you need to do to ad a watermark, change a watermark or remove a watermark from any already uploaded images is to have Picasa overwrite the online images with a fresh copy. One way of doing that on a PC is:

Set up Picasa to ad whatever watermark you want or have to set no watermark at all.

Select all images in the local album, Press Ctrl + R (turn all of them 90 deg right), let Picasa sync everthing in the album, then press Ctrl+Shift+R (turn them back again), and then let Picasa sync everthing again.

All images in the online album will now be updated with any new watermark settings you applied before the procedure.

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