I'm using Python to generate images using dashed lines for stippling. The period of the dashing is constant, what changes is dash/space ratio. This produces something like this:
However in that image the dashing has a uniform origin and this creates unsightly vertical gutters. So I tried to randomize the origin to remove the gutters. This sort of works but there is an obvious pattern:
Wondering where this comes from I made a very simple test case with stacked dashed straight lines:
- dash ratio: 50%
- dash period 20px
- origin shift from -10px to +10px using
random.uniform(-10.,+10.)
(*) (after an initialrandom.seed()
And with added randomness:
So there is still pattern. What I don't understand is that to get a visible gutter you need to have 6 or 7 consecutive values falling in the same range (says, half the total range), which should be a 1/64 probability but seems to happen a lot more often in the 200 lines generated.
Am I misunderstanding something? Is it just our human brain which is seeing patterns where there is none? Could there be a better way to generate something more "visually random" (python 2.7, and preferably without installing anything)?
(*) partial pixels are valid in that context
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