Author Topic: How do I find the transparent element?  (Read 261 times)

MOsMemoir

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How do I find the transparent element?
« on: September 13, 2020, 03:47:49 pm »
I am doing the layout for my dad's memoir. I am hoping to get it printed with Lulu.com. Now that I upload the pdf, Lulu gives me this warning:

Transparency: We detected an element that may be transparent within your file. We strongly recommend flattening or removing any transparencies in your file.

What should I do now? How do I find out which "element" is causing this warning? How do I remove the transparency?

RodneyLee

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Re: How do I find the transparent element?
« Reply #1 on: September 13, 2020, 04:16:25 pm »
if it's just a warning it may be fine to keep, .png most likely 

utnik

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Re: How do I find the transparent element?
« Reply #2 on: September 13, 2020, 06:02:27 pm »
there is no .png in this file – and no transparency at all, as far as i can see.
if you export it as a .pdf1.3 and it still looks good, you're on the safe side.

utnik

a.l.e

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Re: How do I find the transparent element?
« Reply #3 on: September 14, 2020, 10:35:45 am »
euh, utnik, i'm not sure that exporting to pdf 1.3 and having a look at the output will really help.

if you export to pdf 1.3 you might get a warning that a specific element does contain a transparency, which indeed could help MOsMemoir track her issue.
but if you ignore the warning (or scribus does not detect the issue), as far as i know look at the pdf output will not help in any way...

or am i missing something?

utnik

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Re: How do I find the transparent element?
« Reply #4 on: September 14, 2020, 01:20:26 pm »
hi ale

in my experience scribus doesn't flatten transparencies in a sane way, but if you export to .pdf 1.3, real transparencies will be set to full opacity – and that should be visible in the .pdf-file.

utnik

a.l.e

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Re: How do I find the transparent element?
« Reply #5 on: September 14, 2020, 03:24:52 pm »
ok, i did a quick test:

- a shape with opacity < 100 % wills show up with 100% opacity
- a gradient with a transparent part will show up as full black (probably the other color)
- a png with transparent background will still be transparent.

... so you seem to be mostly right!

utnik

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Re: How do I find the transparent element?
« Reply #6 on: September 14, 2020, 07:00:45 pm »
â€Ĥa png with transparent background will still be transparent.

yes, but technically spoken, this isn't a transparency any more. the partly transparent areas of the .png file will be cut somewhere around 10% opacity (with a sharp edge between full opacity and full transparency) – the .pdf file will really be flat.

utnik

 

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