Forum: Photography

Subject: Part of the Grain story...

Misha883 opened this issue on Dec 03, 2002 ยท 11 posts

Misha883 posted Tue, 03 December 2002 at 9:41 PM

These images each show a (nearly) full frame scan from a 35mm color negative, and a small section at the full 4000ppi scanner resolution. This is not a real scientific test; even though each image is exposed correctly, the relative sky brightness and the color is different in each scene. I'd not want to use these to make any hard comparison between film types. The next part of the story will come if I can scrounge a microscope at work. If I can put optical magnification before the digitization, I should be able to see what the un-aliased grain structure looks like. [I tried using one of those little Intel plastic "play" scopes, but the light source wasn't bright enough. Maybe I can cobble something together.]

Misha883 posted Tue, 03 December 2002 at 9:42 PM

another

Misha883 posted Tue, 03 December 2002 at 9:42 PM

another

Alpha posted Tue, 03 December 2002 at 10:24 PM

A grain focusing scope will show you exactly what grain structure looks like unaliased. Although I have to say I never thought of trying to photograph just the grain field through one, and scanning through one would be next to impossible.

Not really sure whare you are going with this????

PunkClown posted Wed, 04 December 2002 at 12:41 AM

I'm not sure where he's going with it either Alpha, but it is a very interesting exercise! Misha, I like these in depth examinations of film stucture...and btw - go for the "cobbling together" route! (Always works for me)
:-)>

Misha883 posted Wed, 04 December 2002 at 7:19 AM

Guess if I'm not quite sure where I'm going, its not quite as bad as not being quite sure where I've been.

Michelle A. posted Wed, 04 December 2002 at 7:27 AM

I've been following this progression on grain.....it's all very interesting.....can't claim to understand the science behind it all, but I've been getting grain on scans as well like Misha. Using 100 ISO film as well....at 4000 ppi, 42 bit scans. And when viewed at 100% it can be quite unattractive to look at....so while that program you were talking of seems like a good option, it would be great to eliminate it all together....plus it's still on the pricey side......

I am, therefore I create.......
--- michelleamarante.com

Six_Eyed_Smily posted Wed, 04 December 2002 at 8:05 AM

as far as i know it depends on the optics in your scanner, and the optics in your camera. A truly high-end scanner shouldnt produce any grain at all, assuming you have a decent camera and lens... but i think there must be messages missing on my screen, as lots of the above comments seem to be reffering to previous comments that are not there. hmmm.

Michelle A. posted Wed, 04 December 2002 at 10:03 AM

Attached Link: http://www.renderosity.com/messages.ez?ForumID=12379&Form.ShowMessage=980287

Yup you are missing this whole thread here.....read it, and check out the link provided there...

I am, therefore I create.......
--- michelleamarante.com

Six_Eyed_Smily posted Thu, 05 December 2002 at 11:11 AM

AHHA! thanks michelle. the software looks good, but not sure about the 200 price tag... might have to test the demo out, however.

mysnapz posted Thu, 05 December 2002 at 4:27 PM

OK Misha you have my attention I wait with interest for the next Part. :O)

Those who do not want to imitate anything, produce nothing. Salvador Dali