Poisson and Gaussian noise parameter?

[Flashlight]

Hi,

I'm using ImageMagick 6.6.1.

I need to add(!!!) shot noise (modelled as poisson distribution with parameter lambda) to an image so I call

Code: Select all

convert -size 100x100 xc: +noise Poisson noise.png

to create a noise image which is later added to the image I work on.

But what 'lambda' does this poisson noise have? And how to change it?

Same question to gaussian noise, how do I provide sigma and std dev?

Sorry, but the -evaluate option which is cross-referenced in -/+noise option in the docs is not clear to me.


Thanks!!

[anthony]

I don't think anyone really knows what the evaluation parameter does.

[fmw42]

I doubt IM allows the user that much control. But see topic viewtopic.php?f=1&t=14850&start=0