Background to topic:
Scanning portfolio of slides (mostly Kodachrome) with Nikon Coolscan V ED using Nikon Scan 4.0.3 and saving to TIFF. Scanning at 4000 DPI, 14 bit resolution produces 110 MB TIFFs. Having scanned a test selection of slides, I realise that I am going to have a storage problem (yes, I know they’re ‘cheap’ - where you live!).
What effect will compressing a TIFF have on dt if it has already edited the TIFF ?
I noticed that Nikon Scan does not have any options for producing compressed lossless TIFFs but I can compress them - outside dt - using a suitable app. (I’m using FastStone Photo Resizer), using LZW compression. On the 2 or 3 sample that I tried dt opened the TIFF again OK, but the image looked as if I had increased exposure by 2 full stops or so - and this effect could not be ‘undone’ by using the exposure, basic adjustment, shadows and highlights or contrast, brightness, saturation modules.
So I can see the ‘external’, visual effect of changing the TIFF compression on a previously edited file but I have no idea of what other ‘internal’ effects there might be. Any comments?
Am I correct in assuming that dt can open TIFFs which have been compressed with any of the commonly used methods and will produce identical results ?