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Publisher - exporting PDF as prepared to 'press ready' doesn't transform pictures to CMYK


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Hi. Using new version of publisher2.

I was doing a project (1x1m 300dpi) which I wanted to send to printshop. 
I was really surprised, that people from printshop told me that it is not a CMYK project. I quickly checked working color in affinity project - it was CMYK fogra39. I imported project to corel- checked vectors - it was cmyk, but when I checked pictures - they were RGB. WTF? 

I exported it in pdf 1.4, 1.7 checking colour as CMYK - it didn't work. I needed to group up all the page, rasterize it to one layer and then exported it do pdf 1a.

Can someone check it, what is wrong with it? It is very dangerous- here in my case the prinshop was manual, because they gonna print it on plotter. But most of the designs I print in automatic printshops. So if I sent mix pictures and vectors, they will receive rgb pics and convert it automatically without any control... this is very wrong and need to be fixed.  

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In export, you can choose „convert images color spaces“. It is off by default even for press ready preset.

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