links for 2009-07-15

  • The idea is to develop a simple method compatible with the regular shooting technique, to completely eliminate noise from our shots even in the deepest shadows.

    In this way we will recover all textures that noise made unusable and at the same time we will expand the effective dynamic range of our camera in the low light end.

  • Summary

    Create a very high resolution, high dynamic range time-lapse movie. Using HDR software to blend bracketed exposures of the same shot you can create an image that better resembles what the eye sees compared to traditional photography techniques.


    · Shoot with a tripod

    · Set camera to bracket shutter speed. Shooting in aperture priority is a good approach. For most scenes you can either take 3 or 5 shots(depending on your camera’s bracketing options):

    o 3 shots

    § #1 – 2 EV

    § #2 normal exposure

    § #3 + 2 EV

    o 5 shots

    § #1 – 2 EV

    § #2 – 1 EV

    § #3 normal exposure

    § #4 + 1 EV

    § #5 + 2 EV

    · Shooting high quality jpegs is fine but if you can capture RAW you should

    · Use an intervolometer to repeat this 3 or 5 bracket capture sequence at a regular interval

  • If you've seen a particularly eye-popping, out-of-this-world night photograph of a city skyline, or a particularly apocalyptic cloudscape with cartoonish color saturation making the rounds on blogs lately, there's a good chance it was made using high-dynamic-range imaging, or HDR software. And while these images may look like the work of a pro photographer, or at least a seasoned digital-imaging or special-effects expert, the tools to easily make your own amazing HDR images are widely (and in some cases freely) available.
  • Drivers for HP Elitebook 2730p tabletpc
  • If your digital camera does a heavy indoor job, or you want to stop wasting your battery power when you don't have to. Our power adapter is the ideal high-quality, low-cost solution for saving battery power and reducing battery charging downtime. Use this powerful adapter when downloading images to your computer, printing pictures, or shooting pictures at home and save your batteries for when you need them most! Our adapter kit is 100% ACKDC10 (P/N: 9226A001) compatible and guaranteed to meet or exceed OEM specifications. It works wonderfully for:
  • Introduction. TuFuse is a Windows command line program that creates extended dynamic range ("exposure blended") and extended depth of field ("focus blended") images. TuFuse uses a technique known as Image Fusion to combine the "best exposed" and/or "best focused" regions of multiple images into a single "fused" composite image.
  • The SD800 IS (IXUS 850 IS), announced just before Photokina 2006 back in September, is a sister model to the popular SD 700 IS (IXUS 800 IS), one of the better ultra compact models launched last year. As well as an extra million pixels or so, the new model has one very welcome new feature; a 28-105mm (equiv.) zoom lens, making it one of the few cameras in this sector of the market with true wideangle capabilities. Other changes include an ISO 1600 option, DIGIC III processor (complete with face detection focus mode) and a better screen. We liked the SD 700 IS a great deal, and on paper the SD 800 IS looks like another winner. So let's find out if it can deliver the goods, starting as ever with the headline specification:

    * 7.1 Megapixels and 3.8x zoom
    * Wide angle 28mm lens with Optical Image Stabilizer
    * DIGIC III with Advanced Noise Reduction and Face Detection AF/AE
    * Safety Zoom for extra telephoto reach
    * ISO 1600
    * High resolution 2.5" LCD

  • Windows focus stacking software
  • Motion detection delay time calibration page
  • Make ANY Single-Shot Intervalometer into an HDR-Bracketing Script

    One of the popular uses of scripts and automated camera actions these days is to make HDR images (combining several different-exposure images to increase the captured dynamic range far beyond what any camera can do on its own). This used to require some additional and more complex scripting commands, as you can see by studying the HDR Scripts posted here. However, since the Allbest Build was introduced there has been a simpler way where nearly any intervalometer script may be used for this purpose.

    All that is required is that your build of CHDK has the "Extra Photo Operations ->" menu with the built in burst bracketing features, and that your camera has a built-in Custom Self-Timer feature.

  • Ok …. you solved my "f7 enigma", Cris, thanks !
    I could not figure out why f value shifted from 2.8 to 7.1 with no intermediary value on small P&S cameras. I did not know these gems had only 2 f stops, simulated through ND filter on/off.
    There is some litterature on this in the CHDK forum, I should have read more !

    This has undesirable consequences, as a true S-Mode cannot be obtained …
    The question then is : is there a "ND filter" entry in the sd800 chdk menus ? Does it work ? This could be somewhat equivalent to a A-mode.
    Next, does one loose auto-exposure when ND-filter is forced off ? For example, if one forces it off in bright day light, will it yield over-exposed pictures ?

  • Zero Noise virtual RAW
    I have already posted this on LL but didn't seem of much interest to the audience.

    All of us know that captured DR can be expanded by shooting more than once at different expsoure values, and properly blending the information obtained from all those shots (in general highlights from the least exposed shots, and noiseless shadows from the most exposed ones).

    Unluckily most programs performing this task (Photomatix, HDR in PS, Enfuse) do their proper RAW development and tone mapping, so the user looses control over the process.

    What I tried to achieve is to fuse several RAW files, but obtaining another RAW file as output. This resulting RAW file is noise free (as much as the source files allow for) and preserves the highlights, so looking at the information contained on it it can be considered an HDR RAW file. But the new thing is that now the user can develop it in his own RAW developer or preferred tone mapping software.

    (tags: photography)
  • Alternative presentation for Flickr images – gives clean black background and permalink
  • Abstract
    Remote control of almost any digital camera can be accomplished by connecting the camera via USB to a computer system which is connected to a network. This article describes the setup, installation and operation of a system consisting of a battery powered single board computer with wlan adapter. It runs embedded Linux and adapted versions of open source software. No special skills beyond plugging in cables and basic computer experience are required. Total system cost is well below 150 EUR/$. A simple webinterface has been developed which enables wireless remote operation of this setup by other computers connected to the network. Systems ranging from Windows PCs to Palm PDAs are feasible as long as they are capable of running a HTML-browser. Download the software package from here

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