Archive for CHDK

Kaleidoscope lens (day 41)

Posted in 100 day challenge with tags , , on January 23, 2011 by dingobat

I have been looking for a kaleidoscope for a long time. Judging from the toy stores I visited it does not seem that it is a very popular toy these day. I mentioned this to my brother and in no time he showed up with three different types of kaleidoscopes (two for creating abstract patterns and one that creates patterns based on what is in front of the lens).

I cut holes in a balloon and used that to fasten one of the kaleidoscope to the lens of my dlsr, this both kept it in placed and prevented some light leaks.

These are some of the results of shooting with the lens.

I also used my canon pocket camera with CHDK to make a movie of the kaleidoscope that created a moving abstract pattern. I experimented with both making a time-lapse and using the movie mode. The time-lapse can be found in the next post.


High Speed photos (day 26)

Posted in 100 day challenge with tags , on January 8, 2011 by dingobat

I forgot my Canon Ixus 75 pocket camera at a friend’s house a couple of weeks ago and now I finally got it back. It is not a very new or especially nice camera but it is able to run CHDK, which means I can play around with all the extra features that the hacked firmware allows. One of these features is a the ability to take high-speed photos (just how high-speed is discussed in detail here). Not very originally I decided to try it out on falling water drops (seems to be the number one choice for high-speed photography). These are my results.

HDR and tone mapping (day 3)

Posted in 100 day challenge with tags , , on December 14, 2010 by dingobat

This is my try at HDR photography. HDR stands for high dynamic range and is used to make photos with a higher level of detail in the dark and light areas of you photo (as far as I understand).
They are made by blending several photos taken at different exposures. I have done this using my canon pocket camera with CHDK and a bracketing script. With this script I took 7 photos at different exposures. This can also by changing the exposure setting manually.

As far as I can tell there is a large number of programs for producing HDR photos. I choose to use Luminance HDR since it is free, available to windows and (as it turns out) very user friendly. Luminance HDR also took of tone mapping the HDR image so that we are able to simulate/view the high dynamic range of the photo, on the more limited dynamic range of a computer screen.
Luminance HDR is able to tone map the HDR photo in a number of different way, which results in more or less realistic looking photos. These are some of the results I got by playing around with the different options and editing the results in GIMP.

Fattal operator:

Mantiuk operator:

Mixed in GIMP:

I am pretty happy about the result and the workflow. I have seen some really nice interior shoots done using this technique, it could be nice to try and do something similar at a later time.