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Author Topic: Need Noise Fill filter settings help  (Read 2551 times)

June 10, 2016, 08:57:50 AM
Read 2551 times

therealmattb

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I asked this on the inkscape subreddit, then it occurred to me that maybe Inkscape had it's own forum. So here I am!

Hi all. I'm trying to get a somewhat predictable effect to happen when I use the noise filter, but I'm a little worried that the effect I'm looking for is a semi-random symptom of exporting rather than being something I can actually control.

So I'm making a gif of a static-y TV. I've got a TV shape repeated 8 times, and am filling them all with the noise filter.

At very specific settings, I can get these nice scan lines to appear, but I wanted to try to make the scan lines a little thicker (taller), so I messed with the noise filter sliders a bit more (here are the settings that produced that top image). Changing them even a small amount in any direction seems to get me actual random noise, like this.

I can't seem to make those scan lines happen on purpose. Anyone have any ideas?

June 10, 2016, 07:00:20 PM
Reply #1

brynn

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Welcome to Inkscape Community!

Do you mean  that the screenshot you showed is made up of 8 shapes side by side?  Or do you mean that you have them all on top of each other?  If all on top of each other, is that to try to magnify or multiply the filter effect?  Or is this just 1 of those shapes, because you don't need to show the others?

About the randomness being part of the conversion to GIF - it seems like you could test it by opening the SVG or PNG or whatever you're starting with, 3 or 4 or maybe 5 times, and export  to GIF.  If the effect is random, you would see 3 or 4 or 5 different results.  What are you using to convert to GIF?  Are you limited to GIF only?  Oh!  Is the goal to make an animation?  That's why you have 8?

However, I'm pretty sure the Noise filter itself is meant to make random noise.  When I've used it, the result is slightly different every time.  Although now (since version 0.91) there are a few different filters that make a noise effect.  I don't think I've tried all of them.  Have you tried different ones?

Some of our members are very good with filters.  They might be able to give you some tips, whenever they're in the neighborhood.  Do you have an example of what you're trying to achieve?  Or is your current result pretty close already?  Sometimes it helps to see something, rather than imagine it from a description.

If you could share the SVG file, maybe some of us could experiment with what you have, and offer other ideas.

Predictable results....  Do you mean you want them to be slightly different every time, but still have the lines across, one way or another?  That sounds like a custom filter would be perfect!  Someone might be able to make you one....well, assuming it's possible in the first place.  If I have some time later on, I might experiment.  Not nearly as good as others, but still might be fun to try.

Or do you mean that you want it exactly the same every time?  For exactly the same, you could convert to a pattern fill.  It probably would be pretty heavy with nodes, but converting to pattern should help.  But it would be absolutely, exactly, the same every time.

Have you thought of other ways to approach it?  When I first started reading your message, I was thinking of making the lines with paths - like long skinny rectangles, or thick stroked paths.  Add lots of nodes, and use the Jitter Nodes extension.  Give it the right colors, etc.  Then you could apply filters to that.

Or another idea....well, I'm still not sure if you mean 8 stacked up TVs.  But it's entirely possible to use more than 1 filter on an object.  I wonder what would happen if you applied the noise filter to one of your successful filters?  If you do try that, be sure to group the object before you apply the next filter.  I'm not sure what problem that prevents, but I've heard that advice a few times.  So it's add filter, group, add another filter, group, etc.

Hah!  Now I have an itch to exeriment with filters!  Just have to get through some other work first.

(PS - no worries about moving your topic :)
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