Gaussian Blur Effect Changed in 29.1 from 29.0.1
As previously reported in July 2020 when this happened with 24.2: https://illustrator.uservoice.com/forums/601447-illustrator-desktop-bugs/suggestions/40865740-gaussian-blur-effect-producing-different-results-f
This was last an issue with 24.2.3, and since 24.3 it had been successfully fixed with consistent results in 29.0.1.
December 2nd, 2024: We have discovered that the issue is how the Gaussian Blur effect performs on Process vs Spot colours.
In 29.1, Gaussian blur now produces an identical effect on both process & spot colours. We'd consider that a fix, as a designer should expect the same result no matter the colour used.
The challenge here for Adobe is weighing "fixing the blur" vs customer legacy files. As you can see in the comments from my previous July 2020 bug report, customers may have a client with approved files from a previous version of Illustrator.
To save customers from having to reconstruct existing approved designs with a combination of offset path & new gaussian blur values to try and match previous versions of Illustrator...
PROPOSAL: Adobe to please add a "Legacy Spot Colour Gaussian Blur" effect under "Effect →Blur" category.
This way, new designs made in 29.1 onward can use "Gaussian Blur", but if you need to update a file made in 24.0 or 24.3 to 29.0.1, you can just replace the Gaussian Blur with "Legacy Spot Colour Gaussian Blur" on the affected spot colour shapes.
EDIT: Instead of adding a separate "Legacy Spot Color Gaussian Blur", add it as a check box below the Gaussian Blur radius setting. That will make handling old files in 29.x much more efficient. 😎👍
Rob
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Rob
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Example image (wouldn't submit as part of original post)
