I Dare You!

by peter_budo

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8,752 reputation
1130
bio website embedinc.com/olin
location Littleton, Massachusetts
age 58
visits member for 3 years, 3 months
seen 17 hours ago

Electrical engineering consultant specializing in microcontrollers and the circuitry around them. Master of engineering in EE from Rensselaer Polytechnic Institute in 1980.

We are certified Microchip design partners, and have been in the top catagory consistantly since around 2000. Various free downloads related to developing PIC firmware and other things are available at http://www.embedinc.com/pic/dload.htm.


Mar
15
answered How can I recreate the Instagram Filter “Slumber”?
Mar
12
answered Anyone know of a photo sharing site willing to share ONLY a file link?
Mar
3
comment Why are my NEF photos unusually dark in RawTherapee?
@dani: I don't know, that's all particular to whatever software you are using.
Mar
3
revised Why are my NEF photos unusually dark in RawTherapee?
added 2093 characters in body
Mar
3
comment Why are my NEF photos unusually dark in RawTherapee?
@ths: By dangerous I mean the software applying adjustments I didn't explicitly state or give it permission to. Without any such adjustments, which should be the "blank slate" it should start with, NEF files tend to look dark and green. One of the first adjustments I usually apply is to map to the full dark/light range within the gray correction I've set. No, I don't use DCRAW. I mostly use my own software I have created for the purpose.
Mar
3
comment Why are my NEF photos unusually dark in RawTherapee?
@ths: Interpreting the data in a RAW file is of course interpreting the RAW format, just like other file types have to be interpreted too. Files never "show" anything, it's done by programs that read those files, but that's true of all image files, not special to NEF. If you take the raw information in a NEF file and display it as linear RGB, you get what I described. The OPs software is apparently defaulting to that int the absence of specific conversion mapping specified by the user. Software that does anything else automatically would be dangerous.
Mar
3
answered Why are my NEF photos unusually dark in RawTherapee?
Feb
15
awarded  Nice Answer
Feb
14
comment What am I photographing INSIDE my camera?
To see if there is any way of imaging the inside of the lens cap, you would have to open the aperture all the way, not close it. It might also be interesting to cool the camera and/or warm the lens cap before the test. That would maximize the chance of imaging the lens cap in IR.
Feb
12
comment What am I photographing INSIDE my camera?
@Nick: It might work that way. Actually I wouldn't be surprised if there were 3 separate gain stages with 3 separate A/Ds. Switching the gain dynamically per pixel would be too slow. Not changing the gain could lead to low resolution in one or two of the colors. I haven't been envolved with this kind of sensor design, so I don't know how it is handled. It could possibly be handled differently between sensors. These rae all engineering tradeoffs available to the sensor designers. I don't know what is customery.
Feb
12
comment What am I photographing INSIDE my camera?
@Nick: Yes RAW is the direct digital outputs of the A/Ds, but there is a analog gain stage between a sensel and its A/D. ISO settings are achieved by varying that analog gain.
Feb
12
comment What am I photographing INSIDE my camera?
@Nick: But the blue channels is usually less sensitive, so has more amplification, so lower signal to noise ratio than the other channels.
Feb
12
comment What am I photographing INSIDE my camera?
@Chris: You may be right. I just tried to reproduce this with my Nikon D3s and failed. I used a 24-120 zoom at 24 mm, lens cap, 30 seconds, f/4, ISO 12800, eyepiece shutter closed, in a closed metal cabinet (achieved with 5s self-timer). I took two images with the lens cap rotate 90 deg. Both images just look like random noise as you would expect, no large-scale feature like in the OP's picture.
Feb
12
answered What am I photographing INSIDE my camera?
Feb
9
comment Why do my photos “glow”?
I'm not seeing the glow.
Feb
4
answered Shooting flying birds
Jan
30
comment What color corrections are being used here?
@user: Now you're getting into the software and user interface specifics. Ultimately the math for the same result is the same. You'd probably think of it in terms of a specific white balance point, but of course there are other ways.
Jan
29
answered What color corrections are being used here?
Jan
29
comment Is something wrong with my camera display?
@NickM: Nonsense. Of course there are stupid and silly questions. However, I don't see this as one of them.
Jan
27
answered What kind of LR or PS filters are used in these photos?