Jump to content

Recommended Posts

Sometimes I help companies with print ads. Today I received an ad and it had colour format CMYK/8, but when I exported it to PDF and send it to the newspaper I got the following error message: "RGB color is used for transparency group". The newspaper does not allow RGB at all, only CMYK, in ads.

I found the "problem", a transparent rectangle that I attach to this thread. I can not find how to change the transparency from RGB to CMYK for this vector i Affinity Designer. 

How do I change the transparency from RGB to CMYK?

 

test.afdesign

Share this post


Link to post
Share on other sites

Hi Samuel Designer,

Welcome to the forums :)

I've downloaded your file attached and it contains 2 objects, both of which have colour fills. I then added a transparent rectangle without a stroke to the design, exported to PDF using the 'For Print' preset and then opened this in Acrobat, below is the preflight analysis for 'Digital Printing (colour)' which shows no errors and the correct colour space.
image.png

Could you please provide a copy of the original .afdesign & PDF to the following link?

https://www.dropbox.com/request/AZ1xdahWYRQ8hWLTGHIL

Share this post


Link to post
Share on other sites

Hi Dan and thanks for looking in to my problem.

I can not send you the original ad because it is not mine. But I have done some testing and it is only the transparent white bar that is causing problems. I will attach a pdf I exported from the afdesign file and a screenshot from when I upload it to the newspaper and get an RGB warning.

A friend who use Adobe Creative software was able to export the PDF without a RGB warning. So I know that Adobe software is able to change RGB transparency to CMYK. Can Affinity Designer?

test.png

test2.pdf

Share this post


Link to post
Share on other sites
21 hours ago, Samuel Designer said:

But I have done some testing and it is only the transparent white bar that is causing problems.

I am a bit puzzled by what you mean by your reference to a "transparent white bar." I thought that in the CMYK color space, anywhere there is no ink is as close to transparent as you can get, so for printed output the color of the paper is all you see there, whatever color that might be.


Affinity Photo 1.7.1, Affinity Designer 1.7.1, Affinity Publisher 1.7.1; macOS High Sierra 10.13.6 iMac (27-inch, Late 2012); 2.9GHz i5 CPU; NVIDIA GeForce GTX 660M; 8GB RAM
Affinity Photo 1.7.1.143 & Affinity Designer 1.7.1.1 for iPad; 6th Generation iPad 32 GB; Apple Pencil; iOS 12.3.1

Share this post


Link to post
Share on other sites

Hi R C-R,

In the original ad there is a image behind the white transparent bar and then some black text above the bar. But right now it does not mater: Affinity Designer is not exporting everything as CMYK, some parts - like transparency - is still exported as RGB. This problems does not exist white Adobe Creative software because my friend who use that have no problems exporting the transparent bar as CMYK (no RGB!).

I need to find out how to save an ad in Affinity Designer without RGB transparency! 

 

Share this post


Link to post
Share on other sites
37 minutes ago, Samuel Designer said:

In the original ad there is a image behind the white transparent bar...

I still do not understand what you mean by "white transparent bar." If something is 100% transparent, it has no color at all. It is not white or any other color.

Also, in the CMYK printing process, there is no way to 'print' white because there are only four ink colors & no combination of them will produce white.


Affinity Photo 1.7.1, Affinity Designer 1.7.1, Affinity Publisher 1.7.1; macOS High Sierra 10.13.6 iMac (27-inch, Late 2012); 2.9GHz i5 CPU; NVIDIA GeForce GTX 660M; 8GB RAM
Affinity Photo 1.7.1.143 & Affinity Designer 1.7.1.1 for iPad; 6th Generation iPad 32 GB; Apple Pencil; iOS 12.3.1

Share this post


Link to post
Share on other sites
3 hours ago, R C-R said:

I am a bit puzzled by what you mean by your reference to a "transparent white bar." I thought that in the CMYK color space, anywhere there is no ink is as close to transparent as you can get, so for printed output the color of the paper is all you see there, whatever color that might be.

Download the test.pdf and open it in Acrobat and you'll know what is being talked about.

The "bar" is a rounded rectangle with transparency but it is not 100% transparent.

Here I am using Acrobat's Object inspector and you can see that the bar/rectangle itself is a CMYK construct, but its transparency space is RGB.

Capture_000078.png.2bc46a20ede7d7eac555b25bea62703e.png

The PDF itself is using an RGB blend space as can be seen in this screen shot as well.

Capture_000079.png.5af89063792301cbf7ef4cba291dde06.png


My computer is a nothing-special Toshiba laptop with unremarkable specs running Windows 10 64-bit.

Share this post


Link to post
Share on other sites
3 minutes ago, MikeW said:

Download the test.pdf and open it in Acrobat and you'll know what is being talked about.

I don't have Acrobat so I was just going by what @Dan C said he got with that app.


Affinity Photo 1.7.1, Affinity Designer 1.7.1, Affinity Publisher 1.7.1; macOS High Sierra 10.13.6 iMac (27-inch, Late 2012); 2.9GHz i5 CPU; NVIDIA GeForce GTX 660M; 8GB RAM
Affinity Photo 1.7.1.143 & Affinity Designer 1.7.1.1 for iPad; 6th Generation iPad 32 GB; Apple Pencil; iOS 12.3.1

Share this post


Link to post
Share on other sites

We usually use PDF X-1a to avoid transparency, that can cause havoc in printed documents if different profiles are used. It will flatten each part using transparency.
It shouldn't be a problem if your PDF is a the expected size (it won't be enlarged later).

Another quick solution if your document is as simple as your example (plain colours an not a lot of transparent area): you can fill the white and transparent object with the resulting mauve colour at 100%: no more transparency.

It would be interesting to know which PDF version using transparency keep on using RVB until we're able to specify a profile to transparency or know how to avoid it when exporting to CMYK.

Share this post


Link to post
Share on other sites
20 minutes ago, R C-R said:

I don't have Acrobat so I was just going by what @Dan C said he got with that app.

Dan ran a preflight that would not reveal the issue. 


My computer is a nothing-special Toshiba laptop with unremarkable specs running Windows 10 64-bit.

Share this post


Link to post
Share on other sites
2 hours ago, MikeW said:

Here I am using Acrobat's Object inspector and you can see that the bar/rectangle itself is a CMYK construct, but its transparency space is RGB.

Well thank you MikeW! Now we know what is wrong - the document is using "ICCBasedRBG, sRGB-IEC61966-2.1". Why is it doing this? I'am exporting the document as CMYK. Can the Affinity crew fix this in the software?

Share this post


Link to post
Share on other sites
2 hours ago, Wosven said:

We usually use PDF X-1a to avoid transparency, that can cause havoc in printed documents if different profiles are used. It will flatten each part using transparency.
It shouldn't be a problem if your PDF is a the expected size (it won't be enlarged later).

Another quick solution if your document is as simple as your example (plain colours an not a lot of transparent area): you can fill the white and transparent object with the resulting mauve colour at 100%: no more transparency.

It would be interesting to know which PDF version using transparency keep on using RVB until we're able to specify a profile to transparency or know how to avoid it when exporting to CMYK.

Hi Wosven! Thanks for your input :D

Exporting the ad to PDF/X-1a:2003 solved the problem!!! The X-1a file was approved (no RGB transparency warning) when uploading it to the newspaper, and it looked OK and had transparency.

Previously I had exported with "PDF (for print)" and "PDF (for export)", but it keeps RGB in the PDF.

Have a great day Wosven! 

Share this post


Link to post
Share on other sites
1 hour ago, Samuel Designer said:

...

Exporting the ad to PDF/X-1a:2003 solved the problem!!! ...

Because the rounded corner rectangle becomes flattened (i.e., a bitmap) there is no longer transparency and thereby having no transparency blend space at all.

PDF/X-4 will maintain the transparency, set the transparency blend space to CMYK and set the document output intent to your ISONewspaper26v4 profile. However, some print services do not like having the destination output intent embedded if they are complying to the more modern GHENT Working Group recommendations.


My computer is a nothing-special Toshiba laptop with unremarkable specs running Windows 10 64-bit.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

×