Alley in Pisa, Italy

by Lars Kotthoff

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502 reputation
27
bio website
location Mitchell, SD
age 32
visits member for 3 years, 8 months
seen Apr 28 at 2:50
I'm a software developer at a company that develops software and hardware for small to midsized telecommunications companies.

Dec
1
comment Is this statement By Jim Zuckerman incorrect?
Another way to put it is that if the shutter closes before the photon's have a chance to reach the camera, that is a synchronization issue. As a thought experiment say that the speed of light were much slower, so that it takes 1/10 s for light to travel 1 meter. In this case photographing a subject 1 meter away requires one to synchronize their shutter to open 2/10 s after the flash fires, but as long as the shutter is open for the duration of the flash the exposure of the subject won't change.
Dec
1
comment Is this statement By Jim Zuckerman incorrect?
I don't think this is what he meant. He was pointing out why the exposure of the subject didn't change when he changed shutter speeds. Exposure has nothing to do with the speed of light, but rather with how much light (number of photons) is reflected back to the camera from the subject, which here is fully a function of the flash duration and power (and distance). In other words, if the flash had an unusually long duration (say a second) then changing the shutter speed very well could change the exposure on the subject, even though the speed of light didn't change.
Jul
9
revised How do I improve the results of photos taken in a light-box?
Clear my meaning up a little bit.
Jul
9
answered How do I improve the results of photos taken in a light-box?
Jun
25
comment Dropped camera, now lens won't attach to body - How much for repairs?
@dermot You will have to put the camera in manual mode.
Jun
25
comment Dropped camera, now lens won't attach to body - How much for repairs?
@dermot You will have to put the camera in manual mode.
Jun
21
comment What is the optimal resolution required of a picture to print on an A1 size canvas?
Here is a similar question: photo.stackexchange.com/questions/19678/…
Nov
17
awarded  Yearling
Jun
8
awarded  Caucus
Apr
3
comment Am I permanently altering my NEF/raw files if I save changes in Nikon ViewNX 2?
Sorry but -1. I this isn't correct for either Capture NX2 or View NX2 (or even View NX). View NX2 has a "Revert to Original" button that reverts to the camera settings. It's been a while since I've used it, but I'm sure that's all the settings, including white balance.
Apr
2
answered How to *make* a nature photograph?
Mar
30
comment Can I combine several low quality pics into one higher quality picture?
@jrista Look on the bottom right hand corner of the image. It says it was taken with a Cannon EOS 20D.
Mar
23
comment Calculating focal length from photograph
+1: Matt, I think you've made a good point. Based on the formulas I would assume that the units are "pixels" but, the answer of 478.6 pixels would be equivalent to 18mm only if the pixel density of the sensor is ~675 ppi which would mean awful big pixels for a digital sensor. Of course something else could be amiss.
Jan
10
comment What does the under/overexposure warning mean in image editing software?
I don't know if I would say that Exposure is more prominent than brightness in Lightroom. It's listed first because (I believe) its the adjustment you usually want attempt first. I.e. if your exposure is off, adjust that first then do contrast and brightness adjustments, and then pull back on exposure adjustments if needed. Ideally your exposure will be spot on, and you won't need to mess with it. (I'm not that good yet, but I'm working on it.)
Jan
10
comment What does the under/overexposure warning mean in image editing software?
@Thomas: Consider only one channel to simplify. Any operation done on an image is a function taking an integer (8, 16, or 32-bit, depending on bit depth) to another integer. For example, a contrast adjustment may take the 8-bit value of 250 to 255 (i.e. bright values get brighter) and 5 to 0 (i.e. dark values get darker). But because 255 is the greatest value possible for an 8-bit channel, any initial value above 250 would also become 255. Likewise 0 is the smallest value possible, so values less than five would also become 0. These regions would be clipped in that particular channel.
Nov
17
awarded  Yearling
Apr
18
awarded  Quorum
Mar
31
comment What does it mean for a photograph to be “high key”?
"Not surprisingly, since we've inherited a lot of things from painting, it's used there too, or at least was." Doing a quick Google search using the terms "high-key painting" (google.com/search?q=high+key+painting) demonstrates the term is still used in painting today to describe using colors mixed with lots of white (i.e. pastels or lighter tones). Both the historical usage and the currant usage of the term in photography make a strong case the terminology was inherited from the art world.
Mar
14
answered Where are 'People Tags' stored when edited with Windows Live Photo Gallery?
Mar
11
comment Image processing & editing: what is an “unmanipulated” image?
+1 -- Good point about the reasons for photo.net's rules. The point is to classify images to help others learn. One isn't necessarily better than the other, but, after all, there is more than one way to skin a cat. If I see an image that I would otherwise think was a Photoshop job, under the classification of "unmanipulated" I would want to know how they took the photo. I might learn a new skill!