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Blend modes not displaying correctly

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Kurbitur:
Hello,

I have been working on creating a album cover using Scribus and in one section there I have black text above a light blue image with the blend mode on the text set to overlay. In Scribus this turns the color of the text into a light blueish hue in sync with the image. However I sent the exported pdf to the printing company and got a reply back that the text is just pure cyan and doesn't look anything like I intended. After some googling I read that blending modes react differently to CMYK colorspaces over RGB colorspaces. So I guess my question is what am I doing wrong? Or are blendmodes in Scribus still a work in progress? Or do I need to change the colorspace of my file somehow?

Here are some images of what is going wrong
How I wanted it

How the printer see's it


Also if this is not in the right place on this forum feel free to move it.

a.l.e:
hi kurbitur

does the pdf look good?
are the colors in the pdf rgb or pdf?
are the colors in the .sla file rgb or pdf?
have you enabled the color mananagement?
to which pdf version are you exporting your project?
which pdf version is the print shop expecting?
do they correctly support transparencies? (normally, i don't think that the transparencies are involved in the blending modes... but i'm not 100% sure of it...)

lot of questions... they might seem trivial to you... or already be too much... hard to say...

Kurbitur:
does the pdf look good?
That actually depends on the pdf viewer. In Okular it displays just like in Scribus and looks fine but when I open it in acrobat (which the printer is probably using) it looks not so good.

are the colors in the pdf rgb or pdf?
All the images are in CMYK and the pdf is exported for print so it should all be CMYK

are the colors in the .sla file rgb or pdf?
All colors are CMYK

have you enabled the color mananagement?
I tried enabling something there but didn't really understand it so I'm not so sure.

to which pdf version are you exporting your project?
I tried exporting in all version Scribus allows and the text was either completely black and ignoring the blend modes or it was exporting it weirdly

which pdf version is the print shop expecting?
They didn't specify anything but as I tried all versions Scribus allows it doesn't seem to matter at this point.

do they correctly support transparencies? (normally, i don't think that the transparencies are involved in the blending modes... but i'm not 100% sure of it...)
I noticed pdf 1.3 and some of the pdf x versions didn't support the blend modes/transparancies.

I got my brother to recreate this in InDesign to see if it was something with how blend modes behave and when he put a black text on top of the image and applied overlay blend mode the text turned white instead of dark blue like in Scribus so it might be that the blend mode in Scribus is working on some different math or something.

InDesign reference

jghali:
>> (normally, i don't think that the transparencies are involved in the blending modes... but i'm not 100% sure of it...)

That's not correct, transparencies are involved in blending modes calculations.

jghali:
>> I got my brother to recreate this in InDesign to see if it was something with how blend modes behave and when he put a black text on top of the image and applied overlay blend mode the text turned white instead of dark blue like in Scribus

Well the Indesign preview is in this case wrong due to Indesign display defaults. You have to turn overprint preview on and you will see that display will change. If you export to PDF, you will also see that text is not rendered white.

There might be also some confusion due to slight differences of translation. For eg overlay blend mode is translated in French to "superposer" in Scribus while it is called "Incrustation" in my version of Indesign. Same for screen blend mode : it is translated in French to "Ecran" in Scribus while it is called "Superposition" in Indesign.

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