Voronoi effect low resolution

[davide445]

For my 170x200cm poster was using as background one of the abstact paint from the Affinity shop bundle, to be precise the first one of the Vol 4. They are 300 dpi and 5000 pixel long side.

I added a Voronoi effect to get a more mosaic style, but seems zooming to 100% the Voronoi separations line has some resolution limit, like is following the image resolution and not being created as a vector.

This way printed in a 170x200cm poster the printer shop confirm me the jaged line will be even more visible.

Wanted to ask if this is the case so that increasing the resolution of the background image and reapplying the Voronoi effect is the only solution, or there is any other setting able to solve the problem.

[NotMyFault]

Voronoi is a pixel filter, as all filters. But is uses the full resolution of the document, there is no artificial limit. 
 

10 minutes ago, davide445 said:

Wanted to ask if this is the case so that increasing the resolution of the background image and reapplying the Voronoi effect is the only solution, or there is any other setting able to solve the problem.

Yes, only solution. 
 

[davide445]

This is the result upscaling the image 4x to 25k using Upscayl, reducing the size to fit the poster, applying Voronoi with the same settings and zoomed at the same level, to me seems the same as before...

[NotMyFault]

The measures listed in the first post are not clear.

What DPI will you use for the final poster of 170x200cm? Do you use about 25k pixel for 200cm (300dpi)?

If you zoom in to 100% (pixel view), of course there will be visible jagging, but now the dots far far smaller and less noticeable compared to using 5000px (about 75 DPI). 

 

 

 

[Old Bruce]

1 hour ago, davide445 said:

This way printed in a 170x200cm poster the printer shop confirm me the jaged line will be even more visible.

 

20 minutes ago, davide445 said:

... applying Voronoi with the same settings and zoomed at the same level, to me seems the same as before...

I don't know what you mean by "the jaged line".

Is it the outline?

Set the line width to 0

[davide445]

@Old Bruce yes it's the outline, and no, I didn't want to remove it

@NotMyFault now the document DPI is set at 300 dpi (was 75), also the 25k image it's at 300 dpi but in the end I think the outline is following the document and not the image resolution, and I'm probably seeing a screen effect, here a zoom with the 5k image 59 dpi and 300% zoom, there is no jagged line problem.

Will need try to print a portion and see.

[v_kyr]

Voronoi image effects can also be created on a plain vector basis, which can be overall better upscaled as desired ...

... though for the above shown sample with rounded region edges it has be done via some generative scripting/programming in Python. - See for example ...

• Create Voronoi art with rounded region edges

 

[davide445]

In the end seems the solution was rising the document DPI to 300.

I have just seen the print test and with the original background image 5000x6000 pix the Voronoi outline is fine in term of resolution, with the document resolution set orignally to 75 DPI the jagging was visible.