While I was researching something else I came across the topic of slit photography. This is where a set of stills of a moving object are reprocessed into one photo with a one pixel wide row or column being taken from each of the originals. Or a moving object is photographed live but with one pixel wide rows or columns being processed at set time intervals until the whole frame has been covered.
Some examples can be found at Slit-Cam, The Time Machine and Discover Digital Photography.
Some of the sample results I saw got me to investigate further hoping to find a free program for the PC which would produce similar results. Ages searching and reading brought up two but I couldn't get on with either. The first was very simple to use but didn't seem to be ale to make a full size photo, only producing a small section. The other used java scripts which needed modifying every time the photos used were changed.
Then I decided to look to see what free apps for the iPhone were available. Found two and a quick trial of each did produce results. Both are used live, that is while shooting a moving object. Those tried were 'Twist' and 'Slit-Cam' Not the sort of photo apps which can be used hand held so the iPhone was tripod mounted.
I set up a potted plant on my arduino driven stepper rotating platform and tried them out.
I like some of the effects. 'Twist' gives several possible ways of streaking the photos but the resultant resolution is poor. OK on a phone but not much use any larger. Also it is heavily advert driven which can be a real pain. If there were a higher quality ad free paid for version then it would be worth experimenting further.
The free version of 'Slit-Cam' has ads but not so intrusive. There is a paid for ad free version with higher resolution.
'Twist' seems to have a fixed frame rate but 'Slit-Cam' can be adjusted from 1 frame per second to 30fps..