Posted: Thu Aug 27, 2009 9:19 pm Post subject: Scanning trade-offs / kitten / DA70 |
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Nesster wrote:
here's something different from me - an actual photograph made using auto focus Pentax equipment. The camera's a ZX-L, the lens is DA 70 Limited, the film is CVS ASA200. Lighting via AF200T flash in TTL mode. The kitten is less than 6 weeks old, a new arrival. He's very pale yellow.
First image: home scan using Epson software and Epson 4490 at native resolution of 4800 dpi. It makes a huge bitmap/file. I cropped the center and then downsized it.
Second image: slight crop (off top and bottom) of a CVS minilab scan (at approx 1200 dpi) but no resizing.
I did touch curves and levels on these.
Observations: at 4800 dpi, supposedly optimum for the 4490, I note scanner noise in the image. I'm wondering if there is a trade-off between dpi and noise, sort of like with digital cameras...
Observations: the CVS scan does not scale up well, I made the same crop and same size bitmap & the fur on his forehead started to block up with ugly color stuff.
Observations: the DA 70 still works fine with film. Always has. It's even not too bad to focus manually
I haven't seen much discussion of scanner noise - whether correlated with the movement (banded) or uncorrelated (digital noise). Having read a bit yesterday, I see the cheaper 4490 has more such noise than the dearer 4990, for example. I also wonder if there is a trade-off between dpi and noise - this would make some sense - and that sometimes scanning at the native optical resolution isn't necessarily the best compromise. Thoughts? _________________ -Jussi
Camera photos
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