Hi CC,

for the Mean, Minimum, Maximum, Median, Variance and

Process>Noise>Remove Outliers filters you can see examples of the filter

size (pixel neighborhood taken into account) with Process>Filters>Show

Circular Masks.

See

https://imagej.nih.gov/ij/docs/guide/146-29.html#toc-Subsubsection-29.11.10The smallest radius is 0.5 (using the pixel and its 4 immediate

neighbors). A radius of 1 gives you a 3x3 filter. For most operations,

the largest radius is 1000 (not shown in 'Show Circular Masks' any

more). For the Median and Remove Outliers, the maximum radius is only

100 because median filtering is much slower.

If you want a square or rectangular area instead of a circular one, use

the 'Fast Filters' plugin.

Michael

________________________________________________________________

On 05/09/2017 15:43, cannaroz wrote:

> Hello!

> When I open the minimum filter of imageJ, in the dialogue box it has 2.0

> pixels radius. I was wondering if it is possible to use a different value

> such as 1 or even 0.5, or if it is wrong to use such smaller values

and why.

> Many thanks.

> CC

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