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Re: how to write an ImageEffect filter?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg106499] Re: how to write an ImageEffect filter?
  • From: dh <dh at metrohm.com>
  • Date: Thu, 14 Jan 2010 05:51:31 -0500 (EST)
  • References: <hik90v$6nc$1@smc.vnet.net>


Hi,

a low level solution is to extract the actual picture data from the 

image, modify it and write it back. Here is a simple example where we 

change the gray value:



t = Image[RandomReal[1, {8, 12, 3}]]

t[[1]] = 0.5 t[[1]];

t



Each pixel consist of 3 color values.

Daniel



sibir wrote:

> The function ImageEffect allows to add noise to an image, however the

> options are very limited: only uniform, Gaussian and salt&pepper. I

> need to add Poisson noise. it should be straitforward to to create

> that filter by modifying the Gaussian, but I am not bale to find any

> documentation.

> 

> Anybody out there with a clue?

> 




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