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Author Topic: Change Simplification Threshold  (Read 6080 times)

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Offline Aussie Carolyn

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Change Simplification Threshold
« on: July 29, 2010, 09:41:49 AM »
It is very easy to change the threshold for simplify.
I often leave it open and try different settings for threshold to see which one gives the best result.

Open Edit Inkscape Preferences, either by shortcut keys Shift Control P or the icon on the menu bar, as shown below.
Click on image for a larger view.
« Last Edit: December 31, 1969, 05:00:00 PM by Guest »

Offline PapaSue

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Re: Change Simplification Threshold
« Reply #1 on: July 29, 2010, 05:11:07 PM »
I tried this on my configuration and I'm getting MORE nodes not less. There were not that many to begin with but it does make me go    hmmmmmm

Any ideas?

« Last Edit: December 31, 1969, 05:00:00 PM by Guest »
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Offline Aussie Carolyn

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Re: Change Simplification Threshold
« Reply #2 on: July 29, 2010, 05:45:02 PM »
Hi Susan, I have exactly the same problem. On many files it adds nodes when I simplify even with a very low threshold. Yes, even at .0001.

On some files it works great on others it either adds nodes or just changes the location of the existing nodes, even if Ctrl L is repeated a few times.
If I am using simplify to reduce node heavy objects I leave the change threshold setting options open and try different numbers, usually ranging from .0001 to .0009. In my case a slightly higher number often reduces more nodes than a lower number. eg .0004 will often remove more nodes than .0002. It can vary greatly from object to object.

To the other members, I would be interested to hear if you have the same result, or if it is just Susan and I. I cannot imagine we are the only ones as we have different computer operating systems.
« Last Edit: December 31, 1969, 05:00:00 PM by Guest »

Offline Technomum

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Re: Change Simplification Threshold
« Reply #3 on: July 29, 2010, 08:19:02 PM »
I have noticed exactly the same problem but have not determined whether it is a particular type of file that causes this to happen.
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Offline HeatherM

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Re: Change Simplification Threshold
« Reply #4 on: July 29, 2010, 09:12:16 PM »
It has to do with how many nodes the original Path has.  The more nodes, the more severe the simplification at any setting.  The lower the number the less severe the simplification.  If the setting is too low for the number of nodes, it will add nodes instead of reducing them.  I usually use a setting of between 0.0002 and 0.0004, but I have looked at files where 0.0001 was too severe.
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Offline PapaSue

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Re: Change Simplification Threshold
« Reply #5 on: August 20, 2010, 08:45:19 AM »
WELL ever since I changed my simplify threshold to 0.0001 I got MORE not less nodes.  After batting my head for about a week I finally went to the Inkscape.org forum and asked about it.  Here is the answer.

Quote
The lowest possible value is 0.0001. Change it back to 0.0020 to get the default behavior - or higher if you want 'Simplify' to remove nodes more aggressively.

It appears that since I have my default set to Inches the setting number is different.  I have done a follow up asking if using Inches instead of mm's affects any other settings.  I'll let you know.

Follow the thread here:  http://www.inkscapeforum.com/viewtopic.php?f=5&t=5274
« Last Edit: August 20, 2010, 09:00:12 AM by PapaSue »
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Offline Technomum

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Re: Change Simplification Threshold
« Reply #6 on: August 20, 2010, 08:49:31 AM »
Hi Susan,

The higher the setting the more aggressive the change to the outline.  That is why a lot of us use the minimum setting.  I agree it can give more nodes rather than less so I watch carefully the information on the bottom information bar to see how the node quantity changes.  I think sometimes there is no other answer than to go in and reduce them manually.
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Offline HeatherM

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Re: Change Simplification Threshold
« Reply #7 on: August 20, 2010, 09:53:55 AM »
Another trick that I use if I'm working on a file where I'm combining flourishes made with the bezier and pattern along path is that I will combine all of the flourishes, simplify them, then use Path/Union.  It's a couple of extra steps, but it allows a stronger simplification without rounding the corners.  Make sure that your fill rule is set to nonzero or you will have gaps in the shape.
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Offline Trance13

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Re: Change Simplification Threshold
« Reply #8 on: January 12, 2018, 03:01:43 PM »
Any idea on how to do that now?  It seems that option is missing or has moved in v 0.92
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Offline brynn

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Re: Change Simplification Threshold
« Reply #9 on: January 14, 2018, 01:28:28 AM »
See my comments in your other topic.  Even changing the threshold, with Inkscape, I don't think Simplify will be a good solution.  But I did find what I would consider a good solution, depenging on how you'll be using it.  Cuts the number of nodes by more than half.
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