Red and Blue

by Gordon

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8,942 reputation
1130
bio website embedinc.com/olin
location Littleton, Massachusetts
age 58
visits member for 3 years, 5 months
seen 22 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.


May
19
answered How to scale between two white balance settings for perceptually equal increments?
May
8
comment How can I convert Nikon D5100 .NEF files to .JPG?
"Fairly important photos" should always be saved as NEF in the camera.
May
5
answered Is direct sunlight reflected from white animal fur affected by a polarizer?
May
4
comment Which color for a job interview portrait?
@matt: This is about what color to make the background, not how to achieve that, or any other look and feel, once you've decided what you want.
May
4
comment Which color for a job interview portrait?
This is really not about photography. It might belong on the workplace stack, or psychology.
Apr
24
answered How do I avoid garbled sprockets with bulk loaded film?
Apr
8
answered Do focal plane shutters typically go left-right or up-down?
Apr
7
comment Lenses round ..Photographs square shaped why?
Why did painters usually make rectangular pictures long before there was photography?
Apr
7
comment Lenses round ..Photographs square shaped why?
Photograph shape was rectangular long before there were electronic sensors. Paintings were predominantly rectangular long before there was photography.
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.