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_junglebunk_
Participant
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

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    Ramón G Castañeda
    Ramón G Castañeda
    Inspiring
    January 19, 2009
    Well said, Marco.
    A
    Anonymous
    January 19, 2009
    >I was only pointing out uses for assigning a false profile (I don't know what better term to call it)

    How about just "assigning a profile"? Anything wrong with using the terminology that
    i everyone else
    uses?

    You assign a profile, and, if it seems to fit, then it fits. If it doesn't, it doesn't. What is "false" about that?

    If you are given a pair of shoes that are too small for your feet, are you going to look for "false shoes" that are the right size for your feet, or just the right shoes?
    Was DYP
    Was DYP
    Inspiring
    January 18, 2009
    Same for you.

    I was only pointing out uses for assigning a false profile (I don't know what better term to call it) that is sometimes real useful when wanting to achieve a certain look in a final converted to profile.

    Those that have used this know exactly what I am talking and those that haven't instead resort to name calling instead of even trying to understand it.

    That what I call narrow minded!
    Ramón G Castañeda
    Ramón G Castañeda
    Inspiring
    January 18, 2009
    There's a big difference between having an open mind and having a hole in your head, DYP.

    [Now editing my plonk list to include DYP on it.] Your comment has no place in these forums, DYP.
    Was DYP
    Was DYP
    Inspiring
    January 18, 2009
    >I think it is best to read the author(s) whose writing style(s) you enjoy and can learn from...

    If you want to be narrow minded and not learn anything new.

    Look at what has happened with the big hoax of the last 10 years for example. I spite of all the factual historical and current evidence to the contrary there are some very narrow minded people that still believe it and vote politicians in who will stop at nothing to take our money and our liberties away based on that hoax.

    I hate narrow minded people.
    A
    Anonymous
    January 19, 2009
    >If you want to be narrow minded and not learn anything new.

    I don't see how such condescending statements advance
    i any
    conversation. If you wish to be specific, be specific. Otherwise I would prefer to be spared the posturing and the stench of superiority.
    A
    Anonymous
    January 18, 2009
    I just skimmed this thread and it seems like the original question was never really answered. Forgive me if I missed it in there somewhere.

    The reason your ProPhotoRGB image gets darker when you assign AdobeRGB is that ProPhoto is gamma 1.8 while Adobe RGB is gamma 2.2. In this case it's the GAMMA mismatch, not the gamut mismatch.
    _
    _g_ballard_
    Participating Frequently
    January 18, 2009
    FALSE PROFILES, alternate profiles, other profiles, real profiles, true profiles

    I haven't read anything by Mr. Margulis, but would have to put "false profiles" wording under writing style (and without reading how he set that wording up, I can only speculate what he means by that).

    I think it is best to read the author(s) whose writing style(s) you enjoy and can learn from...
    L
    Lou Dina
    Known Participant
    January 18, 2009
    DYP,

    I agree...."false profiles" have their place and can be a useful tool. They have come in handy on many an occasion in my professional work experience, (whether you call them a false profiles, temporary profiles, non-standard profiles, or whatever). Dan has some positions I consider silly and he can very very controversial and stubborn, but he also has some good information. Good information is good information, wherever it comes from. It doesn't makes sense to throw out the baby with the bathwater, just because you don't like the source. I disagree with many of his positions, but take what is worthwhile and incorporate it into my arsenal.

    I sure would like to see the rhetoric on this unmonitored forum softened a little bit. The intent is to learn, share, and help others, not skewer people we don't like or pummel the uninformed.

    Peace.

    Lou
    Was DYP
    Was DYP
    Inspiring
    January 18, 2009
    Nobody said you had to grasp the concept. If don't want to consider the option it bring to the table, so be it.

    I am not defending anyone. I just know what can be achieved by doing this.
    Ramón G Castañeda
    Ramón G Castañeda
    Inspiring
    January 18, 2009
    On the contrary, DYP. We left the box behind a long time ago. Others haven't and are still stuck there.

    I don't even think about the box any more ordinarilyuntil someone brings the smelly, old, moldy box up.
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