Advice in catalog organisation : preview size for archive catalog ?
I have an iMac 5k, so official guideline is to use 5120 preview size.
That's 6MB per picture on average.
I intend to migrate to C1 my old aperture catalog, of 20 000 pics catalogs.
that will require 120 GB, only for cataloging... (and 120 GB backup)
I wonder if there would be any benefits to set a much smaller preview size. I would likely lose a little time each time I access to the full image, but since they are on SSD on local machine, and I won't do many edits, that should not be a big deal.
Any advice ?
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It seems that my question did not generate much interest.
So I went by my own and tried a few tricks.
I set up a test library of 469 pictures selected randomly in my Master library. That's approximately 2% of my library.
If I set preview size to 5120, I get a a catalog size of 2,17 GB. That's 4.6 MB per picture. A title lower than the 6MB above, which is logical, as there are some old pictures which are low definition.
If I set preview size to the lowest (640), I get a catalog of 105,3 MB. That's more than 20 times lower.
This would translate in case 1) in a master catalog of around 108 GB, against 2,1 GB in cas 2)
Well, that's not the same !!
How does this affect the performance in every day use ?
This is were it becomes subtle.
My understanding is that it depends strongly of your computer setup.
C1 seems to work on the preview it generated at the import, unless this image is too small to fill the screen in what case it fetches it from where it is.
In case 1) the preview is in your catalog, generally an SSD, so it is fast, but is is a 5MB file.
In case 2) you will be limited by the speed of fetching the RAW, and converting it.
On my setup, which arguably is quite powerful (iMac i9 + masters on ssd), I can't hardly see any difference. Both take a fraction of a second to go full definition. Weirdly enough the 2) seems a bit faster.
On top of that when you view one image, C1 seems to load the image before and after, which makes it seamless when you move to your next edition.
Bottom line is, on my setup I seem to be better off setting the preview size very low for my global catalog. This saves me ssd space on storage and backup.
Nota : this is not a viable strategy, if your masters are on a separate slow HD, which might be the case if you shoot a lot. I decided to go full SSD for my pics as I was fed up with the slowness of HD on a previous setup. For backup, but also for access as there was each time a few seconds to start the drive spinning. On top of the noise it makes. I do not shoot a lot, so I can stay several years with this setup, with no need to play with external sources.
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