Comments

Author Comment Last activity Moderation
warren "I think the best plan may be to try focusing the webcam with the spec open and using a webcam program. It should be focused as it ships, actually. " | Read more » about 8 years ago
warren "Hmm, I can't see any spectra on your profile at https://spectralworkbench.org/profile/smurpau Are you sure the earlier spectrum you posted was a f..." | Read more » about 8 years ago
smurpau "Thanks for your reply @stoft. The light source is a fluorescent tube (there aren't any CFLs available here). I also have a green flashlight and my ..." | Read more » about 8 years ago
cfastie "There is probably someone living down the street from you who knows the names of all the trees in Berlin and would be flattered if asked to share t..." | Read more » about 8 years ago
warren "Followup; this is kind of neat; this graph shows the amount of noise removed: " | Read more » about 8 years ago
Parth "Hi Chris, Thank you very much for elaborate me more about filter and also for clear up my confusion. I read your research note regard the Dual ba..." | Read more » about 8 years ago
liz "Oh hey Cort! Great to see your work again! " | Read more » about 8 years ago
warren "OK, I apparently burned out my Trinket somehow, because I can't re-upload; but i have a 2nd one. I uploaded the latest version of the sketch (which..." | Read more » about 8 years ago
warren "I was able to upload the sketch, but it only changes once per second -- i was hoping for a smoother change, and I'm also not sure it's ever outputt..." | Read more » about 8 years ago
warren "So awesome, thanks Cort! I modified your code for the Trinket and put it on Codebender.com, using pin #4 (analog pin 2) for the potentiometer and p..." | Read more » about 8 years ago
shanlter "Thanks @DavidMack, the calculation method as well as the EPA's guide are very helpful! " | Read more » about 8 years ago
hagitkeysar "Thanks Nick! bigger and badder sounds good :) pls email me you address I'll send the booklet to you. " | Read more » about 8 years ago
cfastie "Correction: When I calibrate Corrected Snowy CFL (with itself), I can get a Fit as good as 5. But the two spectral images are not well aligned when..." | Read more » about 8 years ago
cfastie "Ah, set as in SW set! Here is one with CFL spectra from you, me, stoft, and spectra4cps: https://spectralworkbench.org/sets/3165. All of these sho..." | Read more » about 8 years ago
warren "Oh, just the spectra you're looking at to reach those conclusions. Sorry to mix vocab :-) " | Read more » about 8 years ago
cfastie "What do you mean by references? " | Read more » about 8 years ago
warren "Could you make a set of good double green line references to look at? " | Read more » about 8 years ago
warren "There are a few places where we do math -- like convert from 0-255 to 0.000-1.000, and when repeated over many pixels, its possible that there are ..." | Read more » about 8 years ago
cfastie "Jeff, I made a corrected (ideal) version of the Snowy Sky CFL spectral image when we were working through this in October. This is the basis for t..." | Read more » about 8 years ago
cfastie "Parth, Good question. You might think that digital cameras were good examples of intelligent design, but they are more like living organisms which..." | Read more » about 8 years ago
Parth "Hi Chris, Thanks for your quick response. I am little confusing with the NIR light bandwidth because of NIR light's band width is 700 to 900 nm a..." | Read more » about 8 years ago
stoft "Yes, the flexibility is good and yes, that plot is better because it doesn't alter what is real and clearly shows the effect of just cutting off th..." | Read more » about 8 years ago
warren "Well, i'm not saying this is an important step in any particular analysis -- just that you can do operations like this easily with the transform to..." | Read more » about 8 years ago
stoft "Ah yes, the new plots are there. However, the entire shape of the spectra has been shifted so the ratios between peaks are thus different from the ..." | Read more » about 8 years ago
warren "Fetching multiple pixel rows is possible with the spectrum.imgToJSON() method in the new v2 API: https://github.com/publiclab/spectral-workbench/b..." | Read more » about 8 years ago
warren "As to time-averaging, I think it'd be pretty easy to implement, but would ONLY work if a spectrum is really vertically aligned -- so no uploaded sp..." | Read more » about 8 years ago
warren "Hi, Dave - try reloading the page - i briefly edited the spectrum while chasing a bug, so you may have seen it in the wrong state -- tell me what y..." | Read more » about 8 years ago
stoft "I'm confused by the two plots. The 'noisy' plot doesn't have the signal so I'm guessing it's an average of what is left after chopping off anything..." | Read more » about 8 years ago
warren "So glad that worked! Was getting worried :-) " | Read more » about 8 years ago
stoft "Glad this note is helpful. Between using a "clean" CFL spectrum for wavelength calibration, a sharp narrow slit, performing a gain-correction and b..." | Read more » about 8 years ago