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Blurring only a part of an underlying picture to make the text readable


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I would like to reproduce and use a function that I saw in one of the first presentations of Publisher. It was about text on the picture with the climber. I saw that it was possible to draw a rectangle (Designer) behind the (multi-column) text and the photo area under this rectangle could be blurred with the box blur (Photo) so that the text in front of it was easily readable. I am not able to reproduce this effect: I always have to create a duplicate of the photo, place this duplicate photo in the rectangle. But this is not the solution, because every time I change the layout I have to duplicate and frame the picture again. What am I doing wrong.

Beispiel Publisher Blur.afpub

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11 hours ago, Wosven said:

Check your PDF, but the text will be rasteried... perhaps not what you want in the end.

 

11 hours ago, Hens said:

One can, after applying the effect, group the effect with the image/pixellayer>rasterize this group, to have it not rasterise the text though

The text won't rasterize if the blurring is nested as a child of the image (as opposed to inline with the image and text).
So, the rig can remain flexible and non-destructive... there's no need to rasterize (or make a copy & rasterize) the group/effect before export. 🙂

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HI @Martin Diestelmann. Why make this so complicated? Why not put a Box Blur on the underlying graphic layer and mask it?

Affinity Photo 2, Affinity Publisher 2, Affinity Designer 2 (latest retail versions) - desktop & iPad
Culling - FastRawViewer; Raw Developer - Capture One Pro; Asset Management - Photo Supreme
Mac Studio with M2 Max (2023}; 64 GB RAM; macOS 13 (Ventura); Mac Studio Display - iPad Air 4th Gen; iPadOS 17

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