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January 14, 2009
Question

Assign- Convert - Proof Colors

  • January 14, 2009
  • 51 replies
  • 15476 views
In Photoshop, I can choose to assign or convert to profile. This seems straight forward, I think.

I was given images in ProPhoto RGB color space (8 bit). Just as a test, I did two things. I created a Proof setup that used Adobe RGB and Peceptual Rendering intent. Then, I also went to Assign Profile. Both cases the image was darker and lacked detail (given the smaller color space)...

My working space for RGB is Adobe RGB with perceptual rendering intent.

Next I turned the proof colors off and I converted the file to Adobe RGB. In this case, the color changed very little (was not dark at all).

I thought I understood that if you assign a profile, the appearance on screen will differ (and the numbers will stay the same), If I convert, the numbers actually change.

question: Why would the image look very dark when I was assigning the profile, but look the same as the original when converting?
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    51 replies

    January 21, 2009
    >I know, sorry I can't same the same about you.

    So sorry not to meet your provenly high standards.

    So, at the cost of interrupting the oh-so enlightening banter by repeating myself -- one assigns a profile, and, if it seems to fit, then it fits. If it doesn't, it doesn't.

    If you would deign to reply from the height of your lofty expertise, what is "false" about that?
    Was DYP
    Inspiring
    January 19, 2009
    >Oh, you are a color management pro? Nice.

    I know, sorry I can't same the same about you.
    Was DYP
    Inspiring
    January 19, 2009
    >I fully understand why the true pros in the field of color management resent Mr. Margulis, and righfully so.

    I don't. At least not as much as I do you.
    January 19, 2009
    >I don't. At least not as much as I do you.

    Oh, you are a color management pro? Nice.
    Ramón G Castañeda
    Inspiring
    January 19, 2009
    Marco,

    Your post #51 is dated earlier than my #50. Hope you can still read it.
    Ramón G Castañeda
    Inspiring
    January 19, 2009
    Marco.

    I, for one, have very much appreciated your comments and observations. Thank you.

    I don't read or even see all the messages in this thread, as I do have a plonk list, but I do know at least one frequent contributor who revels at turning any discussion into a personal attack in the Photoshop Macintosh and Photography forum, then tries to accuse his interlocutor of doing exactly that. Transparent psychological projection, I suppose.

    Since that contributor has the same first name you quote in #48, I guess that post may be directed at that person, who happens to idolize Margulis. (Yes, he's now plonked.)

    Let me stress that I have absolutely nothing personal against Dan Margulis. In fact, I have seen him at conferences and in no way do I dislike the man. He even reminds me of several very good friends I have in Russia.

    I do acknowledge that the man can be a magician at color correcting images for press printing, as I believe I have stated here too.

    My beef with his teachings stems from the considerable damage done to me personally by his Professional Photoshop book at a point in my life where every minute counts in term of life expectancy.

    Having strived to ameliorate that damage, I learned as much as I could about color management, so I fully understand why the true pros in the field of color management resent Mr. Margulis, and righfully so.
    January 19, 2009
    You started out having an intelligent discourse but when it took a left turn into the intelligence went right.
    January 19, 2009
    More diversion. Well done, Peter. You do that very well, and intelligently.
    January 19, 2009
    Sorry Marco, but to me it sounds like you just have some private vendetta against Margulis. Have you actually worked with some of his ideas or are you against them only because you don't like the man.

    Most of the complaint I've read against Dan simply aren't true, especially if you've actually read the books. His techniques are completely compatible with modern color management. If fact, using both together makes you a better, more effective imager, but you'd actually have to open your mind to enjoy those benefits.
    January 19, 2009
    Yes, it's all about me. Not about the substance of what I wrote.

    Good job, Peter. Never mind that I tried to have an intelligent discussion. What was I thinking...?
    Known Participant
    January 19, 2009
    Amen, Peter! Let's forget the origin and focus on techniques that work. Let's build up, not tear down. There are lots of ways to achieve high quality results. Nobody has all the answers.
    January 19, 2009
    >There are lots of ways to achieve high quality results. Nobody has all the answers.

    I view that as misplaced equanimity. There is such a thing as muddying up the water, after all, and spreading misleading notions like that of "false profiles".

    If nobody has all the answers, those who talk such nonsense surely don't even have a few.
    January 19, 2009
    Because often times assigning a profile other than the one that came attached to the image is not the one that will finally fit. It's a means to a different end. Indeed it is a false profile. There's nothing wrong with calling it by a name that seems to make a lot of sense - false profile. The big objection it seems, is not the name, but the person who started calling it that.

    DYP - I'm in your corner on this.
    January 19, 2009
    >The big objection it seems, is not the name, but the person who started calling it that.

    It's
    i both
    the person (one who, to put it charitably, claims to know more than he actually does)
    i and
    the name.

    How do you figure that the profile which makes the image look right is "false" and the one that a clueless operator ended up embedding, and makes the image look wrong, is "true" instead?
    Was DYP
    Inspiring
    January 19, 2009
    Ok then lets call it assigning none correct profile.

    I think you know exactly what I mean why nitpick about?
    January 19, 2009
    >I think you know exactly what I mean why nitpick about?

    "Nitpick"? You are the one who insists on using a terminology that no one else uses. And gives no good reasons for its use either.