Hi Sarah,
I've not much to add on image size to what has already been covered. As for metadata if you can embed it do it, of course it can be erased, but at least you have done it.
You mentioned security, this can mean using a service like digimarc (http://www.digimarc.com/) or similar. This however, has always to me seemed to me to be a blind alley, because for it to be effective you would need to pay their annual fee and then have the resources available to pay a lawyer to chase down the offender in the particular jurisdiction concerned, this could be anywhere.
The digimarc pricing can be found here.
http://www.digimarc.com/docs/discover-resources/dmrc-osp-price-sheet.pdf
The issue is that once they are online, that's it, they are out there, you can write to the person concerned and request that they remove an image, that is about all you can do (lawyer route excepted). There is an old (in internet years) adage, 'If you want real security don't put them online'.
I'd be interested to know of anyone on the list that is using watermarking these days.
Tony Harris
New Media Officer & Photographer
Government Art Collection
tony.harris @culture.gsi.gov.uk | 020 7580 9123
@govartcol /governmentartcollection | www.gac.culture.gov.uk
-----Original Message-----
From: Museums Computer Group [mailto:[log in to unmask]] On Behalf Of Sarah McHugh
Sent: 27 November 2013 12:36
To: [log in to unmask]
Subject: [MCG] Online image size guidelines?
Is there any advice or set of guidelines about the size and quality of online museum artefact images or online artwork images?
Also any advice on image watermarking or embedding IPTC data into images such as copyright owner, contact details, credit etc?
In the past we have always made sure our images are small size 300 pixels at longest edge and 72 dpi. We'd like to make our online images larger but would like to know of any security settings we should be using.
Any advice or direction would be greatly appreciated.
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