StarMask (small scale growth)

[ngc1535]

Hi,

I cannot say at the moment if this is an "issue" or not....

When using StarMask if the Large Scale growth is set to 0... then no small scale growth seems to occur regardless of the values I input for compensation and growth amount.
In my case I also unchecked all other options (to be safe) such as aggregate ...etc.

Could someone verify this behavior?
Is this correct and perhaps not an "issue" since there may be something about growth that requires large scale to be checked? (and basically I just don't understand something)
Otherwise could it be a bug? I am using win10, 64bit, PI v 1.08.05.1353

-adam

[msmythers]

Adam

It looks that way to me as well. I avoid using growth so I hadn't noticed.

Here's a screenshot of a very simple starmask. Top is both growths to 1 and the bottom is large growth off.

Mike 

[ngc1535]

Thank you very much for checking it out Mike.
I am pretty good at checking boundary conditions (because they also tend to be places of simplification).

If this thread needs to move to the bug report section..that is OK with me... but still not certain if it is one or not.

-adam

[msmythers]

I'm not sure if it is a bug either. Small scale growth is tricky at best which is why I stay away from the growth settings. If I really need growth I tend to use a combination of dilation in MorphologicalTransformation and the Convolution tool. I feel I have more exacting control. You can also up the smoothing in the Star Mask tool and lower the truncation to bloat the mask.

Mike

[ngc1535]

The growth of small or large features independently in a mixed scale mask is clever. However, I have found that I need more control of the small stars (which are more numerous) in a mask. So setting the large scale to zero would be desirable at times.

I couldn't figure out a way to "send" this thread to the Bug report section... so I will repost over there.

-adam