Custom Colors convert to CMYK automatically, when we set "Effect->Blur->Gaussian Blur".
When we apply Effect->Blur->Gaussian blur an object with a custom color, it will be converted to CMYK color in overprint preview mode.
Also, when we export PDF, it will convert to CMYK.
The steps you were taking when you experienced the issues
1. To make pathItems that colored Custom color.
2. Select it and apply Effect->Blur->Gaussian Blur.
3. Open Separation preview panel and check Overprint preview.
4. Custom color objects seem to convert to CMYK.
5. To export it to PDF, the custom color will discard and convert to CMYK.
Your expected result
We lose custom color when applying Effect->Blur->Gaussian Blur.
Your actual result
Keep custom colors like ver.24.1.
Thanks for reporting this issue.
We are able to reproduce this issue and investigating it further.
Mitch Knight commented
24.2.3 update does NOT fix this issue despite a comment here that it does. I spoke with an Adobe support representative yesterday again and it was claimed that there is an internal build without set release date that has resolved this issue. The representative was very motivated to close the support ticket despite it not actually being resolved for the customer. I think that was because they are judged based on speed of ticket closure instead of outcome which is extremely dumb and unfortunate.
Hopefully we'll see another update soon.
Justin Taylor commented
Agreed, still an issue in 24.2.3, we've had to downgrade back to a previous version because of it.
When will the problem be solved?
It's a serious thing.
Sorry! The problem still exists. I did check it with drop shadow and it's ok, but with gaussian it's still broken :(
Not fixed on the 24.2.3, still the same problem.
PMS colors are still converted in CMYK when using a Photoshop effect in Illustrator.
I still have to work on an old version of Illustrator. Am I the only one?
It's fixed in the latest update (24.2.3)
When will the problem be resolved?
How should I explain to my customers that the artworks are not finished because the software is faulty?
That is not acceptable.
Mitch Knight commented
Prepress department of international producer of retail packaging. This is a very severe issue that should be immediately patched. It's already causing production issues for very large international brands.
There is a tedious work-around that involves photoshop:
Make your Gaussian blur object as usual in illustrator, expand appearance, then unembed the resultant image. Open it in photoshop, ctrl-click / command-click (whatever the mac equivalent is) to make a selection of the layer's transparency. Then go to channels and make a new spot channel in the pallet menu, fill with black. Select the desired spot color (PANTONE or whatever custom spot color you need), save the file with a new name and link that file back into illustrator in place of the one you unembedded.
You'll be able to select it and see that illustrator says it still uses the spot color.
Depending on what your output file is, for example PDF, you can use acrobat to view the output preview separations and verify that the blurred object is a spot color. See the images I have attached here.
Alternatively, you could use the same unembedded image from previous steps and change it to grayscale mode, then link *that* file back into your illustrator document and give it a fill with your desired spot color. I think that should also work though I haven't tested it.
EDIT: I tested the above method and it does work, but the CMYK-to-grayscale image is *too gray* to work as-is, you'll need to add a levels adjustment and drag the left-side (darkness/shadow) slider to the left-most edge of the histogram to darken it to black, and maybe drag the middle (midtones) slider a little right as well.
@ Adobe: not only is the illustrator blur rendered as CMYK by default, but it's DeviceCMYK at that... ignoring any color management policies. See the image I have attached here showing that the original blurred object is DeviceCMYK instead of GRACoL like it should've been.
EDIT: @Adobe, ignore the above. I was using a different PDF joboptions than normal which resulted in the CMYK being uncalibrated. CMYK's are calibrated as expected when the PDF is saved correctly.
I work in a screen printing shop and have used the gaussian blur in spot colors for years now. All of a sudden it is converting it back to CMYK colors. I see that others are having a similar problem, but don't see if progress has been made to fix this, as the original post is from the end of last month. I truly hope this will be resolved. This feature is something I use on a constant basis, and I don't see a very easy work around for it.
Yes its happing here too.
Please fix it asap. We cant check every artwork for this....
Can confirm this happens under Windows 10 also. I don't know that I ever used a photoshop raster effect on anything with a spot color before, though, so I don't have any previous work to compare my test file to.
Art saved to PDF, output preview in Acrobat does not list any spot color channels (art in illustrator is single vector rectangle with a spot color fill and stroke, then Gaussian blur applied)
Justin Taylor commented
When applying a guassian blur in Illustrator 24.2 on our Macs spot colors are changing to CMYK, even with the preserve spot colors option turned on.