Hi Katherine,
At the British Geological Survey, we carried out a major digitisation project of all 125,000 boxes of our North Sea hydrocarbon well rock core samples - see, for example, http://www.largeimages.bgs.ac.uk/iip/index.html?id=20120704/S00050923 . We used a Phase One P45+ camera to capture high resolution (7216 x 5412 pixel) images quickly. We decided to archive the RAW files to tape (actually in EIP format for Phase Two cameras) because they contained all the colour information, some of which is lost on conversion to TIFF. We did this because we captured all the core images under standard lighting conditions with colour reference cards and we thought it likely that we would want to carry out more sophisticated image processing at a later date, and opening all the boxes again was not an option.
Because the EIP format is proprietary and might be relatively short lived, we also saved the files in DNG format ("Digital Negative"). This is a more archival format for RAW files.
We then used the derived TIFFs for all the post processing and generated JPGs for thumbnails and JP2s (JPEG2000s) for delivery. We really like JP2s for delivery, because when combined with a suitable web viewer, they deliver high resolution images without the need to download all the file. See one of our geological maps as an example: http://www.largeimages.bgs.ac.uk/iip/mapsportal.html?id=1001655 . We also used JP2s for image delivery on the GB3D type fossil database: http://www.3d-fossils.ac.uk/ and http://www.largeimages.bgs.ac.uk/iip/gb3d.html?id=/Photos/CAMSM/P881202.jp2
With storage so cheap, I would recommend saving RAW files in addition to TIFF. You might even consider conversion to DNG. At the very least, a RAW file on a different drive would be a useful backup to a TIFF.
Mike
Dr Mike Howe
Chief Curator
Head of the National Geological Repository
Phone: 0115 9363105 Email: [log in to unmask]
WSB UGN - British Geological Survey
Keyworth, Nottingham, NG12 5GG
-----Original Message-----
From: Museums Computer Group [mailto:[log in to unmask]] On Behalf Of Katherine West
Sent: 30 March 2016 14:04
To: [log in to unmask]
Subject: [MCG] RAW vs TIFF files
Hello,
I was hoping some of you might be able to give me some advice.
I am working on a HLF project in the New Forest aiming to create a website which will be a portal to information on the New Forest. This includes digitising a large part of the New Forest Centre's museum and library collection to be uploaded to the website as well as forming a high quality digital archive.
We have purchased a digital SLR camera and will be using it to digitise a range of objects, from maps to glass plate negatives and 35mm slides. We have a limited budget and will be storing digitised copies on the cloud and an external hard drive.
We are currently discussing whether we should be saving the RAW files or whether TIFF files will be sufficient for a master digital archive. Our concern is that RAW files might take up too much space on our storage system, but also that we should be capturing the digital copies with as much detail and information as possible for the future.
Has anyone else had any experience of this? Do other organisations often use RAW files instead of TIFF? What are the advantages either way? Any advice would be a huge help! Thank you.
Katherine.
Katherine West
Digitisation Officer
New Forest Knowledge Project
Please note: My working days are Wednesday - Friday. I may not be able to respond to emails immediately outside of these days. Thank you for your understanding.
New Forest Centre
Lyndhurst
Hampshire
SO43 7NY
Email: [log in to unmask]<mailto:[log in to unmask]>
Telephone: 023 8028 6150
Website: www.newforestcentre.org.uk<http://www.newforestcentre.org.uk/>
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