Tuesday, December 23, 2008
Csr Bluetooth Drivers For Windows 7
Sunday, December 21, 2008
Keratosis Pilarist Tattoo
Focus Stacking: First approximation
The technique known as "Focus Stacking" is to combine multiple images with different focus on a single image. This is done in general May achieve depth of field DOF.
The first practical application of this technique is in macros where the DOF is very limited and it is not advisable to take the opening beyond F11 or F16 to get into trouble no diffraction. Landscapes can also be used to obtain an image with an opening hyperfocal that this would not be possible.
Among several programs that focus stacking mention the 3 most popular: Helicon Focus
(commercial, no trial)
CombineZM (freeware)
Tufuse (freeware)
The first two and CombineZM Helicon Focus are the most popular and I think give the best results.
to focus Workflow stacking is quite simple:
- Assemble tripod and others in the most stable possible camera in manual focus. (Yes or yes)
- To focus on what the more distant in the photo (in a landscape at infinity)
- Remove photo
- Move the focus a tad forward trying to overlap the areas in focus between photo and photo.
- Remove photo, repeat ...
acceptable results in general it takes 10 or 12 photos and very good results 20 to 30 photos. I have seen wonderful results with about 24 or 25 pictures so we can calculate the number of photos to know how to go by moving the focus.
have a lens with a wide focus ring travel helps a lot.
Once the photos taken general it is easy to assemble the stack of focus on any of the programs. Helicon Focus is considerably more friendly interface for your CombineZM but they are very evenly matched final.
This technique is probably the great secret of many who take macros with incredible DOFs, it is necessary that the subject does not move at all so yeah.
Example:
This is the first picture of a stack of 10 photos to get an idea of \u200b\u200bwhat was the original DOF in each frame:
This is the result with Helicon Focus
This is the result with
CombineZM
Despite having used only 10 photos are quite acceptable results, both as CombineZM Helicon Focus give similar results in my opinion. I guess with the result 20o 30 photos end could have been even better.
Next Steps: Try the same but with a landscape.
Thursday, December 18, 2008
M Jak Milosc Online 801
Merging exposures from a single image
I return to the fray with the great unknown "enfuse" free software that is wonderful.
This time the objective is to propose a simple way to dump the dynamic range of a RAW to JPG.
As we know the RAW file as it comes out of the camera has a dynamic range much larger than a jpg, because of this we can change the exposure to reveal the RAW and improving the light of the photos we have gone a little burned or a bit dark. The "sect" to expose to the right is based precisely on this to overexpose everything possible to burn an image without anything and then adjust the exposure to reveal maximizing the amount of information received by the pixels and thus reducing noise.
Passing the RAW to JPG is basically what we do select a small part of the dynamic range captured in RAW and turned to JPG, it is often more than enough but in other cases the dynamic range of the scene is greater than what can display a JPG. The following method is intended to merge the dynamic range of a RAW file into a JPG using free tools and free.
Step 1: From RAW generate all the JPGs for all possible exposures.
Ie starting from RAW to JPG generate exposure -3, -2.5, -2, -1.5 and so on until +3.
This can be done by hand but is tedious, I use a software called ufraw, very nice to reveal RAWs and has a batch mode. To install ufraw
visit this page:
http://ufraw.sourceforge.net/
Once installed I made 2 batch files (for Windows) to automate the process:
enfuse.bat
-
---------------------- ----------- cut for%% Y in (% 1) do uf.bat%% And
--------------------------------------
uf.bat
- ------------- ------------------------ cut
ECHO% 1 for%% X in (-3 -2.5 -2 -1.5 -1 -0.5 0 0.5 1 1.5 2 2.5 3) do "c: \\ Program Files \\ Gimp-2.0 \\ bin \\ ufraw-batch. exe "- out-type = jpeg - compression = 100 - Exposure =%% X% 1 - wb = camera - output =% 1_%% ----------
X.jpg -------------------------------
(the guioncitos are not part of the file, had to clarify your understanding. ..)
Just create the files with the specified name with notepad or similar and replace the uf.bat the path they have chosen to install ufraw on their computers.
Storing these two files in a directory along with the RAW to process (or several) so we use:
enfuse.bat *. CR2 (Process all RAW)
or enfuse.bat pepe.CR2 (process a specific RAW)
simpaticos The result is 13. Jpg files for each RAW with all of our RAW dynamic range, the following is merge all.
enfuse Package / Enblend if you do not have this here:
http://enblend.sourceforge.net/
The enfuseGUI you can download it from here:
http://software.bergmark.com/enfuseGUI /
Once installed, simply change the number of exposures to 13, use the little button "+" to select the files to merge and click on "enfuse!". After a few Minutillo we should have a nice file TIFF with the end result.
The final file is an image of low contrast high contrast global and local that is good process it using levels to adjust the contrast. Gimp, Photoshop or whatever you use if you are reading at this point going to work very well. Auto-levels work well in most cases.
Example:
JPG image exposure based on more reasonable (and left the Chamber)
JPG image based on the RAW Enfusion:
practical applications:
I found that images with The skies are usually pretty good results as the dynamic range of the sky and the subject that we are taking is generally not go well in a JPG. Differences
HDR
tonemapping
Here there simply fusion exhibition so the overall result is an image of less visual impact but a more realistic HDR. Should not occur halos and other artifacts displayed in the HDRs.
Sources:
The enfuse and ufraw is nothing new and many people use. This process as far as I've invented myself, and I firmly believe that sharing what you learn or develop the best way to learn. Besides there is nothing magical here, anyone could have invented this in their homes in a rainy day.
Olympic Beach Volleyball Cameltoe
As this is half over I'll start with a controversial phrase to attract the attention of readers:
" Upload ISO does not increase noise in the pictures "
Noise:
In a photograph taken at normal shutter speeds, ie less than one second 99% of noise in the image has two origins:
- photon flux Noise Noise reading
sensor noise photon flux
This is the main source of noise because it is the self-noise of an image is independent of the camera and use and is absolutely inevitable, even with perfect technology.
Given a scene point its luminosity is given by the number of photons originating from the same, suppose you have a point that has a brightness of 1000 photons per time interval, if the photon flux was always constant camera sensor provided 1000 photons would arrive within a fixed time. However, the photon flux is variable and the variation is given by the square root of luminosity. This means that the photons to the sensor 1000 will be arriving 1000 + / - 31.62 photons. This difference between the photons should reach the sensor and really get is noise.
From here we can draw several interesting conclusions
The first is that as you increase the brightness of the image (signal) noise increases by 100 photons have a variation of 10 as noise photons variation in 1000 is 31.62.
However, in a photo which affects the image quality is not the absolute amount of noise but the rate signal to noise ratio, it is understandable if we consider the following:
Suppose a pixel having a brightness value 1000, if we vary 1 point this light the result is totally invisible to the naked eye. If the pixel brightness instead had varying 1 point 1 would be equivalent to doubling its brightness or to turn off the pixel completely and this is much notary. From here that the more obscure the larger picture will be the noise due to an unclear image signal is low and the rate signal to noise ratio will be much higher. Many say "a picture is more noise in the shadows ", this is false, in the headlights there is a lot more noise in the shadows but as the signal rate is high signal to noise is less and less noticeable. This serves to impress in talks amateur photographers coffee.
As the noise is the square root of the signal as the signal rate increases signal to noise ratio decreases, in 1000 there are 31 noise photons for a 3.1% signal / noise in 2000 photon noise is 44.7 2.2 % signal to noise ratio.
Conclusion
simple: You have to take a picture with as much light as possible. Viva light.
The "cult" to expose to the right is based on this, there are many articles that explain erroneously that expose on the right is good at talking of levels in the RAW and the like, the truth is that the idea is simply to maximize the rate signal to noise and better capture more light. The image quality "optimal" in a camera at ISO100 is achieved with the histogram as far right as achievable. More on this a little later.
Another thing we also see is how to do "stacking" of images helps to eliminate the noise if the brightness of a point is 100 + / - 10 due to the noise taking enough pictures we can make the average brightness point is as close to 100 as we want all of this is eliminated completely, the image noise.
The noise reduction camera can not eliminate this type of noise it is impossible to know whether a point sensor that receives a certain number of photons should actually receive more or less. An advanced camera could eliminate noise taking 100 pictures instead of one and averaging values \u200b\u200bbut by the time the cameras do not do this and must be done by software.
noise sensor reading
This source of noise is due to the imperfection of technology. If the sensor 100 photons will reach the sensor does not always register 100 photons but the value varies a bit registers. The overall oscillation is constant and not dependent on the brightness of the scene. You can eliminate much of this noise by taking a picture with the lens cap position; under the assumption that no photon should be recorded by the sensor
everything is recorded sensor noise and can be removed from a photo taken with identical exposure parameters. This is what makes the noise reduction of the camera, just take a picture with the diaphragm closed for the same exposure time and everything that appears in this picture if I was also in the original photo deletes the same as it is known is noise.
Read noise sensor has 2 components one is reading the number of photons that makes sensor is imperfect and the other is the analog / digital sensor that makes the number of photons at a certain voltage.
RF + RL = RL = RC
read noise RF = read noise photon noise
RC =
conversion depends on the RF signal is amplified by increasing the ISO. But RC is constant.
Then:
RL = G * RF + RC
where G is the amplification factor due to the ISO.
Note that as RL increases the signal increases as RC is constant but the increase is not proportional. Sean
100 photons with an error + / - 10 and G = 1 (ISO 100). Sea RC = 5 (arbitrary)
RL = 1 * 10 + 5 = 15
As the rate signal 100 signal to noise ratio is 15/100 = 15%
If we double G (ISO 200)
RL = 2 * 10 + 5 = 25 (Signal = 200) as a sign
now the rate is 200 SNR is 25/200 = 12.5% \u200b\u200b
Sean now 1000 photons with an error + / - 31 and G = 1. Sea RC = 5 for the same sensor
RL = 1 * 31 + 5 = 46
rate / N = 46/1000 = 4.6%
If we double G RL = 2 * 31 + 5 = 67
rate signal to noise ratio = 67/2000 = 3.35%
Conclusion: As we raised the ISO read noise increases but the proportion of noise with respect to the signal decreases (!).
then return to our phrase controversy
" Raise the ISO does not increase noise in the pictures "
The main reason for which to raise the ISO the pictures we leave is more noisy simply that we get less exposure time and reduce the signal.
1 / 100 ISO 100 has less noise than 1 / 200 ISO 200. This is nothing new.
While reading the sensor noise increases to raise the ISO we have learned that what really matters is the rate signal to noise when turning up the ISO helps to raise the signal is then up the ISO continued imposition of the time we reduce the noise exposure photo.
No, I'm not crazy. Here is an example.
Be the histogram:
The histogram corresponds to a normal picture as we see the dynamic range of the scene is smaller than the sensor and is "space" in the histogram to disclose in a different. The farmers of exposing to the right will immediately recognize that increasing the exposure of the photo could be reduced noise. Pompously we know that all noise actually increased the signal but also increase the rate decreasing signal / noise and that noise is a function of the square root of the signal.
Now suppose for the photo in question can not be changed exposure, was the maximum opening of the lens and if you change the shutter speed something terrible would happen, for example, a blurred picture. Does it make sense then increase the ISO to right the histogram? The answer is yes and this is the great "idea" presented in this article.
If we can increase the ISO move to this type of histogram:
What we do is increase the signal by the ISO and as we have demonstrated timely read noise increases but does not increase in proportion to how the signal increases due to the constant component RC.
This has immediate applications for those who take moving objects in poor lighting conditions, concerts, sports, etc.
While the optimum to expose to the right is out at ISO100 at slower speed we can in these conditions there is some shutter speed limit, if the histogram permits must then increase the ISO to lower noise photos. Also applies to the moon and astronomical photography in general, if the histogram permits, ie without burning your headlights must be removed at the highest possible ISO if the shutter speed can not change because, for example, stars would show trace or the moon would move us in the image. Conclusion
practice
Suppose we have a picture at f2.8 and 1 / 100 ISO100 and assume that the histogram supports 1 stop change the headlights without burning.
The optimum is then draw the same picture on 1 / 50 ISO100 increasing the signal noise without generating extra reading out in ISO minimum.
If you change the shutter speed is not possible then it is better to get in 1 / 100 ISO200 and then adjust the RAW 1 / 100 ISO 100, noise increases reading but is offset and exceeded by the increase of the signal. The rate signal to noise ratio is lower.
repeat:
f2.8 ISO100 1 / 100 is "noisier
that
f2.8 ISO200 1 / 100
Assuming that in both cases there is no high beams SETTINGS burned and both are correct for the scene.
References:
"Noise Dynamic Range and Bit Depth" by Emil Martinec ( Noise, Dynamic Range and Bit Depth in Digital SLRs )
"Expose Right" Cambridge in Colour ( Expose Right )
"Rawanalize" A RAW software to analyze raw images. ( http://www.cryptobola.com/PhotoBola/Rawnalyze.htm )
Monday, December 15, 2008
Shotshell Holder Remington 870
Comment: For me "The Marathon of TV-3" is already part of the events within the month of December (The Constitution, La Purisima, Santa Lucia, La Marathon TV-3 , Christmas Eve, Christmas, Boxing and New Year). month from 4 milions d'euros spokespersons recaptats ahir, pass the Mitjanit, The Marathon of TV-3, macro- devoted in this edition (the 17th) to raise funds for the investigation of serious mental illnesses such as schizophrenia, depression, anxiety and bipolar disorder. Once again, Marathon again demonstrated the ability to mobilize regional television, as well as "the spirit of solidarity of the Catalan society," as noted by the President of the Generalitat, José Montilla, just one of thousands of volunteers who attend the calls of those who made donations.
Sunday, December 14, 2008
When To Hang Owl Houses
extraterrestrial solar radiation is often taken as a constant value of 1367 W/m2, in its normal component. If an imaginary surface outside the atmosphere is horizontal, is affected by the cosine of angle between l radiation and the normal vector to the surface. At ground level, the radiation will be affected by the factor of clarity, with the upper limit of this value.
Alcad
Friday, December 12, 2008
Leroi Air Compressor Parts Breakdown
rookie at this, I saw that besides Eppley, a serious business to consider is Kipp & Zonne , which has a subsidiary in Europe to Campbell Scientific. Among the curious things offers data acquisition systems for PCs called dataloggers, able to work with these sensors that in turn offer:
pyranometers
The pyranometer CS300 (PYR) based on silicon photocell is manufactured by Apogee Instruments. The spectral range is 300 to 1100nm, collecting most of the radiation short wave that reaches the Earth's surface. This sensor measures solar radiation for use in solar studies, agriculture, meteorology and hydrology.
This photovoltaic pyranometer, if you look at their caracteríaticas, has a residual error correction cosine of + -4% at 75 ° and + ° 1% to 45 º. Comparing this figure with that of the notes, which are given to a solar altitude of 10 degrees, I would not judge their class. Perhaps in this the oprofesora apodría us help. I think they are more accurate are the thermoelectric like Eppley, the PV, although there are universities, committed to improving the design of the latter, by lower cost. In a photovoltaic, a simple mosquito landed on it can distort the measure, but I guess with the quality system can be ignored, and the fact itself is not important.
http://www.campbellsci.co.uk/index.cfm?id=514
Denise Milani Tipless
'm also looking into this activity, keep the PC clock loses accuracy:
Double-clicking the clock on your PC and itching on the tab "internet time" shows that our clock is synchronized on a weekly basis (and possible instant Manula), with the clock of a server, which by default I have is: time.windows.com. We can add the tab "Internet time" and the white window any of the links to the servers that we know. I tested with hora.uv.es (University of Valencia) and works perfectly, giving update now button. The problem I see of this system is that it auto-sync windows once a week, and perhaps over it without realizing lose synchronization.
in softonic Furthermore I found a trial version program 100% operational for a month, called Mobile TimeSyn 2.1.0
very professional and also be the option that the server of our company, having a network time server NTP solid state as the company offers Galleon, which is a complete solution to synchronize the time across computer networks. The Network Time Server Galleon NTS-4000-GPS-R combines a GPS receiver embedded computer with a built-in solid state and offers a simple configuration and management through a network interface.
Alcad
Create A Wifi Network From A 3 Mobile Dongle
The event was held last night at the Salon de Grados of the house of higher learning, with the assistance of vice-chancellor of the UNC, Gerardo Fidelio and the Dean of the Faculty of Medicine, José María Willington, after which he gave a lecture Khamashta "Antiphospholipid Syndrome, 25.
Baixar Rom De Pokemon Battle Revolution
Comment: For that ye in that area, do not miss the . It sure is interesting.
Wednesday, December 10, 2008
Moose Mountain Screen Machines Race Car
Analemma is called, and is due to the difference between the mean solar day (the one that marks our clock) and true solar (varies because the orbit is elliptical and the axis tilt globe with the plane of the ecliptic).
LASL
If a photo includes an eclipse, is called tutulema.
If you want to know more, this is related to the so-called equation of time. Watch this funny link:
http://www.juntadeandalucia.es/averroes/iesgaviota/fisiqui/relojsol/horas.htm
Alcad.
Tuesday, December 9, 2008
Gorge Washington Bridge Toll $
Comment: No you can imagine joy I had when a friend of mine passed me the address of a web page where made reference to some posts of Lupus. It contained three blocs , the two friends and mine. Les
answer them my gratitude, which I copy verbatim: " Thank you, know that your blog helps other people is very comforting because it meets the reason to start it. Carme.
in this space will outline 3 blogs that deal with Lupus. This is the answer to that in recent months published a note about Lupus and have noticed that there is still strong ignorance about it, so we want to know more disease to be well prepared in case of suffering or dealing with someone with the same.
As stated by Gaby Couto: "lack of information to society is destroying lives and not the same disease."
See full story.
Enfamil Gentlease Rash On Face
Monday, December 8, 2008
How Long Before I See Results From Zumba?
Thursday, December 4, 2008
Does Preparation H Help Anal Fissures?