On Sun, Jun 16, 2013 at 7:45 PM, Tony Arnold
<[email protected]>wrote:
> > I've sent some pictures to print (3 different online shops), and they
> > resulted quite darker than what I see on screen. A lot of dark zones
> > detail is lost. All 3 with very similar results. Also, the exported jpgs
> > are darker that what I see on darktable, when I see them in the the
> > browser (Google Chrome). The profile I use when exporting is sRGB
> > perceptual.
>
> I think you need to calibrate your printer. Not sure if your calibration
> device has that capability, but if it does creating an ICC profile for
> your printer would be a good idea.
>
I don't own the printers, and they don't provide ICC profiles. They told me
to send the pictures with the sRGB profile.
> >
> > Now, playing with the Output Color Profile module... I see that the
> > screen profile is set to "system profile". If I change it to sRGB, the
> > image I see (darkroom) looks exactly the same as the exported JPGs. I'm
> > not sure what I'm changing here... Is the monitor ICC profile ignored if
> > I change this?
>
> Once you have a printer profile, you either need to use that when
> exporting jpeg in DT and ensure that your system does not use the
> profile when printing. Or, set the system to use you printer's profile
> then set the exported image to use sRGB (I'm not sure on this step, to
> be honest).
>
> Here is what I think happens. After demosaicing, the RAW file is
> converted to an internal colour space using the camera's ICC profile.
> The internal colours are converted using the screen's profile. When you
> export an image, the profile in the image is used to convert the pixel
> values in the image back to this internal form and then the printer's
> profile is used to convert this internal form back to pixel values for
> the printer.
>
> Every device has a gamut, which represents the limits of the colours
> that device can accurately display. Screen gamuts are much larger than
> printers, so the outputs may look different if on the screen you see
> colours the printer cannot reproduce.
>
> Having everything calibrated and the right profiles used everywhere
> should minimise the differences.
>
Given that I don't have the ICC profiles of the printers they use, what
would be the best method for getting better pictures? How does the color
conversion (when they print my sRGB images) work to mitigate the difference
in gammut?
Also, what's the point of choosing a different screen profile in the Color
Output Profile module? How does it affect the system ICC profile for the
monitor?
Thanks
Julian.
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