Wednesday, November 25, 2009

A large, high dynamic range file - Polaroid Type 55 Negative

Video, audio and photographic imaging share many things in common, including the need for lots of data to deliver and present detailed information over a large area, or time frame.  In the case of music, compression schemes lighten the data load while degrading the original file.  Images suffer the same degradation in jpeg compression.

Blogger is set up to give you a clickable thumbnail image, like the one you see on the left derived from a 4X5" Polaroid Type 55 black and white instant negative shot with a view camera.  The scene is Hemlock Gorge in Newton, MA, where the Charles River spills over several dams built before the turn of the last century.

Click on the image, wait for it to load (a fraction of a second if you have broadband) and thank google.Or click here and get the full size file.


Anonymous said...

Very nice photo. This would make a nice print at 8X10. I thought that I had broadband but it took more than 30 seconds to download the whole file. Happy Thanksgiving N1IPP

Bob Crowley said...

Thanks. I think this should hold together well larger than that - it's a 4X5 negative, and I scanned at the lowest resolution for a 10Mb file.

Regan said...

At the very top of the image there is a dotted white line that appears to be some kind of artifact. Is this from the scanning process? Must be a hi-res scanner, the contrast is excellent.

On an unrelated note, are you able to add an RSS feed for the blog?

Bob Crowley said...

That line is the separation line from the Polaroid negative emulsion to the positive or proof print. All of the type 55 prints/negatives had this to some degree. Type 55, along with all other Polaroid film, is long gone. A type 55 4X5 negative could be nearly as good as sheet film.

The scanner is an Epson 750 with the 4X5 scanning plate, dry scan using Silverfast SW. This is a low resolution scan. I can make a two-pass scan over 1 Gb and that is what they do now for making very large prints digitally from large format negatives.

RSS and Atom feeds are available, and turned on. There is at least one running elsewhere that delivers the text and thumbnails of this blog, but I have not run across it in a long time.

Bob Crowley said...

I see this is post 641.

Anonymous said...

are you sure this is polaroid? I have never seen one this clear.