Since I blog a mixture of health and programmnig, my old tagline May all your work reduce to O(1) just didn’t cut it any more. Fortunately I have a found a perfect replacement:Chunky bacon!!
This is the perfect combination of both worlds. Unfortunately, only few readers will get that chunky bacon is actually good for your health
. Even fewer readers will get that this is actually a famous programming reference
. Even fewer readers will get that it is actually both…
Today I have read about the Instagram Engineering Challenge: The Unshredder, and decided to give it a try. The task is simple to explain: Create a program that can unshred this image (do not try the challenge on this image, try the original PNG source instead!):
I have postet here that I think I can solve it in 2 hours, and got some downvotes for that; so I have decided to really give it a try. Long story short, it took me about 2 hours and 35 minutes.
Before I started developing, I made some quick assumptions to simplify things:
- I want to code it in Ruby, this is the language where I am most productive.
- I can assume the size of the stripes is well known, and I have hardcoded this size.
- The image can be converted to RAW with an external tool, and written into RAW.
I have just created my first Android app. It is a simple game, called Single N-Back. It has been shown in multiple studies that this game can improve your fluid intelligence.
You can get it here:
Continue reading “Single N-Back”
I have recently joined the bitcoin network, and generated PNG images from these excellent bitcoin vector graphics. I have extracted all relevant images, and converted each one into a PNG with transparancy, and in 60, 90, 300, and 600 DPI. All PNGs are recompressed with optipng -o9 to be as small as possible.
The zip file contains these images in 60, 90, 300, and 600 DPI:
Continue reading “Download Bitcoin Logos”
I’ve been playing a bit with QR code generators, and tried to generated a very small one for this homepage. This is the result:
The file is 21×21 pixels, and has just
178 165 bytes. It works with my cellphone from a distance of about 7cm, and gets you to http://martin.ankerl.com/.
How did I create it?
- Create very short URL to the link you want to create the QR code for. I’ve used j.mp with the customize link feature, and played a bit with special characters like _ until I got a working link.
- Create a QR code for this link, with low error code correction. This generator has this option.
- Open the file with your favourite image editor, cut off the border, resize it by factor 1/4 with resample to get a QR code where each black dot is one pixel wide.
- Save as .png, without any additional information.
- use IrfanView’s PNGOUT, and afterwards optipng -o9 to recompress the picture.
Can you make a smaller QR code with working weblink?