Sean Anderson

Sean Anderson

CA

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  • Sean Anderson
    Sean Anderson
    Participant
    Posts: 9
    Why is there BPC but no WPC?
    on: September 24, 2022 at 9:13 am

    So BPC is a patch job then.

    patch-job

    Sean Anderson
    Sean Anderson
    Participant
    Posts: 9
    Re: Why is there BPC but no WPC?
    Reply #1 on: September 18, 2022 at 5:29 am

     

    My shrink tells me that all the time 🤪

    In your book on page 97 it states that checking the Simulate Black Ink box turns off Black Point Compensation. But the next paragraph states that selecting the Black Ink check box turns on Black Point Compensation. I’m confused (and dazed). Do you mean that when Simulate Paper Color and Simulate Black Ink are both check, then BPC is turned off; but when only Simulate Black Ink is selected, then BPC is turned on?  Please clarify. Thanks.

    BPC

    Sean Anderson
    Sean Anderson
    Participant
    Posts: 9
    Re: Breathing Color River Stone Satin Rag
    Reply #2 on: September 16, 2022 at 3:34 am

    I’m interested in trying this paper because it’s the only double-sided baryta on the market. But this video (link here) shows it has nasty gloss differential and speckled white spots. Can anyone confirm if this is a problem and if spraying with varnish fixes it?

     

    Sean Anderson
    Sean Anderson
    Participant
    Posts: 9
    Re: Why is there BPC but no WPC?
    Reply #3 on: September 16, 2022 at 1:57 am

    I thought I would link this white paper in case a reader might be interested. The math is over my head but it helped clarify a few things.

    https://www.color.org/WP40-Black_Point_Compensation_2010-07-27.pdf

    1. All rendering intents map the source black point to the destination black point. This is true whether Black Point Compensation (BPC) is turned on or off.

    2. All rendering intents map the source white point to the destination white point. So there is no need for a separate WPC button.

    3. BPC is a modification and improvement to the Relative intent formula. Without BPC, The Relative rendering intent causes too much shadow detail to be lost. This is why the BPC box should always be checked when using Relative.

    4. BPC has little to no effect on the Perceptual and Saturation intents. BPC does not work with Absolute nor should it.

    5. Now if Adobe had only built the BPC inside the Relative algorithm, there would be no need for a separate BPC button and life would be simpler. But I’m sure there’s a reason why they were separated. I just don’t know what that might be.

    Sean Anderson
    Sean Anderson
    Participant
    Posts: 9
    Re: Why is there BPC but no WPC?
    Reply #4 on: September 12, 2022 at 9:17 am

    I tried to link the photos, but it didn’t work. And somehow my post disappeared. I’ll take your answers and move on. Thank you for responding.