: How do I remove the alpha channel from the air spray filter in Inkscape? I'm trying to simulate a cloud of data points around a graph and I found that the air spray filter applied to a

@Lengel450

Posted in: #Effects #Inkscape #Transparency

I'm trying to simulate a cloud of data points around a graph and I found that the air spray filter applied to a copy of that graph will give me almost what I want, especially when changing the morphology effect operator from dilate to erode.



This doesn't look too bad, although now the wannabe data points are maybe a bit too weak depending on output resolution. In any case, especially when magnified, you can see another problem:



Some of the pixels have a really low alpha value which doesn't make sense in my scenario. I'd like all pixels to have an alpha value of 1.

I tried playing around with the two blend effects the air spray filter contains but to no avail. I then tried to force the alpha channel to 1 using the colour matrix effect with the following setting.

1 0 0 0 0
0 1 0 0 0
0 0 1 0 0
0 0 0 0 1


But of course this sets everything that has alpha value 0 to 1, too, with a rather devastating effect.



Is there a way to turn only the orange pixels non-transparent but not the background?

I know, when exporting this to PDF it's unlikely that the air spray effect will survive without being rendered as a raster image anyway so I probably could go through that cycle once and then do something to the raster image. But if there is a more elegant way to do this, that'd be great.

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