August 21, 2013 § Leave a comment
Use this chart to determine the ‘set and forget’ settings (temperature and pressure) to apply to your kegged beer to properly carbonate it with a CO2 pressure tank. There are a couple of these around on the net, but usually limited to degrees fahrenheit and a few other annoyances for me, so I took a couple of minutes to put together mine own slightly more simplified version.
August 20, 2013 § Leave a comment
- Install and upgrade Xcode to 4.3 or above.
- Install the Xcode Command Line Tools (you can do this from within Xcode’s “Downloads” preference pane).
- Install Homebrew, using the instructions here – http://brew.sh/
- Force Homebrew to install version 1.1.0 of QEMU
git checkout 2b7b4b3 Library/Formula/qemu.rb
- Install GCC compiler, needed for compiling QEMU
brew install https://raw.github.com/Homebrew/homebrew-dupes/master/apple-gcc42.rb
- Install QEMU
brew install qemu --env=std --use-gcc
- Download and extract the zip of your Raspbian image – I used http://downloads.raspberrypi.org/images/raspbian/2012-12-16-wheezy-raspbian/2012-12-16-wheezy-raspbian.zip
- Download a linux kernel, I found this one to work – http://xecdesign.com/downloads/linux-qemu/kernel-qemu
- Put the above in a directory and boot the image like this (replace image names if you downloaded something different):
qemu-system-arm -M versatilepb -cpu arm1176 -m 256 -hda 2012-12-16-wheezy-raspbian.img -kernel zImage -append "root=/dev/sda" -serial stdio
October 6, 2008 § Leave a comment
Larger version: here
This shot is made up of 7 RAW shots from my Canon EOS 400D (aka Rebel XTi) w/ EF-S 17-85mm IS USM lens, here was the process I followed:
1. Mounted the camera on a tripod in portrait orientation, doing this has two benefits… firstly puts the barrel distortion introduced by your lens on the top and bottom making the shots easier to blend and stitch, also it’ll give your pano more height. The down side of course is that you’ll need to take more shots than you would with landscape to get the same field of view.
2. Put the camera in Manual mode to ensure that the exposure is locked. If you use any of the Auto/Semi-auto modes… your camera will re-meter for exposure for each shot – causing the brightness of each shot to differ.
3. Then I selected a specific white balance, in this case ‘daylight’ – but the important thing is not to have it on Auto White Balance, otherwise each shot is likely to be a different temperature.
4. Next I dialed in the aperture to a tiny (F/22), this is to ensure that I get the deepest Depth of Field (DoF) as possible so the foreground and background are sharp and in focus.
5. Then I used the auto focus to do the focus work for me, then once focus was achieved I switched to Manual Focus to ensure that each shot is taken with the same focus.
6. Finally, using my Canon IR remote I shot off the first shot then carefully panned by tripod head until there was approximately 20% overlap from the previous shot then shot off again… then continued until I had the complete field of view I was after.
The post processing:
I did the post processing on my Linux (Ubuntu) box, as a minimum you’ll need the following:
- ImageMagick – http://www.imagemagick.org/www/mogrify.html
- Hugin, Enblend, libpano13, Hugin, Autopano-sift-C – compilation instructions for Ubuntu (and other distros) are available here – http://wiki.panotools.org/Hugin_Compiling_ubuntu
Here is the process I followed:
1. Converted my RAW images to JPEG using dcraw. I used a custom version of the script available here: http://jcornuz.wordpress.com/2008/07/10/here-is-a-little-something-for-your-blog/
2. Renamed the .JPEG output to .JPG, because Autopano-sift-C fails with .JPEG extensions.
3. Batch rotated JPEGs using mogrify from ImageMagick (mogrify -rotate “-90” *.JPG)
4. Opened images in Hugin, and got it to use Autopano-sift-C to automatically find the control points between the set of images.
5. Hugin then uses ‘nano’ to modify the geometry of the images, then ‘enblend’ to stitch them all together.
FYI – I did run into an issue with the latest CVS version of Enblend (v3.2), and had to downgrade to a previous version to make it work.
September 16, 2008 § Leave a comment
Go to “Tools > Application catalogue”, click “New”, enter “matrix” into the “Web Address” field, click “Cancel”. Choosing the red pill will activate the red pill mode, obviously, and chosing the blue one will deactivate it.
July 15, 2008 § Leave a comment
I am a big fan of the MS Excel AutoFilter feature, and use it extensively. Every now and then I’m wished that there was some function within Excel to do a SUM function, but only on the rows that are visible as a result of the AutoFilter… well few minutes on Google and a found it.
Use the subtotal function with the relevant function_num, for addition I used 109. For example: =SUBTOTAL(109, A1:A1000)
Syntax: SUBTOTAL(function_num, ref1, ref2, …)
(includes hidden values)
(ignores hidden values)
July 14, 2008 § Leave a comment
I find it a hassle to log into my gmail account to do some Google chat, and I don’t want to load the standard Google Talk fat client, so I did some searching and found a useful article explaining how to put the Google Talk gadget in the Firefox sidebar: here
July 3, 2008 § Leave a comment