POTW #1: Squirrel by the Sphynx

Squirrel

Nathaniel suggested I post a photo of the week (POTW) on the blog. Here is the first, a squirrel in a tree near the sphynx. What do you think? (click image for a larger version)

technical specs:
shutter: 1/160, aperture: f/3.5, focal length: 72mm (432 mm in 35mm equivalency) distance: about 4 meters

Additional notes: In a high contrast image taken with a digital camera, it can be difficult to avoid chromatic aberration (CA), which often appears as purple fringing at the boundaries between light and dark in the image. This is caused by a few things:
1) the red and blue pixels on the CCD are more sensitive to IR than the green ones,
2) IR is focused differently than visible light by the lens
3) I think the interpolation from the RGB images probably has a hand in it too.

This image showed some CA at the lower edge of the branch and around the leaf stem in the bottom of the frame. I removed the purple fringes by desaturating magenta in the GIMP. See the before and after below (this image is also clickable to enlarge):

CA detail
Note that the "corrected" image has also had some adjustments to levels and curves.

  

Tortillas

I accidently bought "carb balance" tortillas this week. Nasty. I thought (and wished and hoped) we were done with that damn carb counting craze. I was thinking "these things taste kind of like cardboard or paper" (you know, like when there's a little cardboard stuck to the bottom of a piece of pizza or you accidently eat the paper that a taco is wrapped in). So I checked the ingredients to see if they included "wood pulp" or "recycled paper", and guess what!? The fifth ingredient is "powdered cellulose"!! Last time I checked, cellulose was the primary component of paper. But just to make sure, I looked up cellulose in a dictionary:


cellulose: A complex carbohydrate, (C6H10O5)n, that is composed of glucose units, forms the main constituent of the cell wall in most plants, and is important in the manufacture of numerous products, such as paper, textiles, pharmaceuticals, and explosives.

The American HeritageĀ® Dictionary of the English Language, Fourth Edition Copyright Ā© 2000 by Houghton Mifflin Company.

So, not only do these tortillas contain paper (or explosives?), but (humourously, in my opinion), cellulose is itself also a carbohydrate. I guess that's why they call them "carb balance" rather than "low carb".