[Scribus] PDF export turns pictures pale

[Craig Bradney]

On Wednesday 02 February 2005 10:27, David Purton wrote:
> On Wed, Feb 02, 2005 at 08:24:48AM +0100, Eilert wrote:
> > The other day I exported some pages to PDF. There were 3 photos on the
> > pages, and as I wanted them to come out as good as possible, I turned
> > the choice to "maximum" quality.
> >
> > Much to my surprise, the photos became rather pale then, i. e. contrast
> > was week, no dark colours (gamma setting?). Choosing a poorer quality
> > let the pictures appear right again.
>
> By poorer quality, perhaps you mean selecting "screen/web" as opposed to
> "printer" when creating the PDF?
>
> Is this the case?
>
> Thinking the difference between screen/web and printer is in quality
> seems to be a common mistake people make. Perhaps Scribus should look at
> renaming these options?
>
> The difference between screen/web and printer, is not in quality, but in
> colour model. screen/web will produce an RGB colour based PDF, while
> printer will produce a CMYK colour based PDF.
>
> > Did I detect a bug, or is it a feature?
>
> Well, that depends...
>
> If you don't have colour management set up, then it is a feature.
>
> If you do have colour management set up, then it is a bug. Colour
> management in 1.2.1 for images is *completely* borked.
>
> (Yes, devs, I really can back this one up - The byte ordering of
> channels expected by little CMS is *NOT* the same as the byte ordering
> used by the QT QColor class. Look at the code and you will see that the
> colour transforms assume that they are the same. Remember ages ago when
> I said that I didn't understand why solid colours where proofed to
> screen differently to images? This is why. As I said before patches and
> bug reports are coming soon.)

Looking forward to them...

Craig
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