Black point compensation: Proofing versus print

[Tonka]

Hi all,

Here's the situation:

Epson SP 3800
PS CS6
Calibrated screen (Spyder3)
Printed on Olmec glossy or Epson semi-gloss papers
Matching paper profiles.
Relative Colormetric.

With soft proofing, BPC toggling makes on screen picture considerably lighter/brighter (on) and darker (off).
Print matches screen softproof with BPC turned off.

There's actually hardly any noticeable difference between printing with BPC on or off.

Why is that? And why does the BPC toggling in soft-proofing make such a big difference?

[digitaldog]

There's actually hardly any noticeable difference between printing with BPC on or off.

In a nutshell, keep it on all the time. It either aids in the conversion due to an issue mapping source to destination black (for some profiles) or doesn't do anything at all.

[Tonka]

In a nutshell, keep it on all the time. It either aids in the conversion due to an issue mapping source to destination black (for some profiles) or doesn't do anything at all.

Hi Digitaldog,

For printing, I agree.

But for proofing, I notice a huge difference on screen, when I toggle it on and off in the proofing profile. When turned "off", the screen to print match is the best.

What I'm wondering is why the big diff on screen, but not on print? And when both on, there's a mismatch.

[digitaldog]

Could be the preview portion of the output profile for one. Could be something going on within the display path. Hard to say.

[Tonka]

Ok. thanks for the reply.

Happens with Olmec and Epson profiles.

Anyway, the current setting works. I'll keep it that way.