Jagged Gaussian Blur - Illustrator 2023

[carlosmoralesquiros]

I'm noticing a jagged effect when using Gaussian Blur effect on some figures. I usually "fake" a shadow with a blured vector but lately I'm noticing that the blur looks jagged.

I've done this for years and never seen it before, so I'm guessing this is a new rendering bug.

CPU and GPU previews look exactly the same, so this is not graphics card related.

See attachments.

[Ton Frederiks]

Maybe Effect > Raster Effects Settings resolution?

[carlosmoralesquiros]

the same i've ever used for years: 72dpi for web, 150dpi for laser/inkjet and 300dpi for lithography.

[Ton Frederiks]

How much are you zoomed in?

[carlosmoralesquiros]

100%

[Ton Frederiks]

Pixel Preview?

[carlosmoralesquiros]

GPU, CPU, Pixel, Print Preview, same problem... makes no difference

[Ton Frederiks]

Restart and Reset Preferences?

[carlosmoralesquiros]

already reinstalled... and removed preferences. I'm seeing this happen in 3 different computers.

have you tried to reproduce it?

1. create a new document (print, web, any resolution or color mode)

2. zoom at 100%

3. create a gray or dark ellipse (any color, makes no difference)

4. apply gaussian blur (enoug to be noticeable, around 3-6 pixels)

5. use scale tool and change size and proportions, look at how the blured edges react while live resizing, and how they still are visible after you release click.

6. try to export the file, those jagged edges are present....

[Ton Frederiks]

Scale tool.. is Scale Strokes and Effects checked?

[carlosmoralesquiros]

it is... have you reproduced it? are you seeing the same jagged blurred edges as me?

[Ton Frederiks]

I tried, but cannot reproduce it with version 27.9

Maybe someone else can help you better.

[Monika Gause]

Here's how that looks for me: https://youtube.com/shorts/_tEKUtWfvag?feature=share 

It gets rough when scaling, but then smooth again immediately (and also that is zoomed in 1000%). Which system and hardware is it?