• channels grayed out

    From eburton@daltonschool.kr@21:1/5 to All on Fri May 12 01:07:48 2017
    I have an image that is in RGB mode, but when I look at the channels tab, I am unable to individually select any of the channels or click the eye to affect their visibility, etc. None of the options at the bottom of the channels dialog are available --
    all are grayed out.

    I've been googling for solutions, but it's been really hard to filter out tons of irrelevant hits. I don't know the correct terminology for "clicking the eye" or whatever other functions might be performed in the channels dialog.

    Does this sound like a familiar problem to anyone?

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  • From Floyd L. Davidson@21:1/5 to eburton@daltonschool.kr on Fri May 12 03:27:37 2017
    eburton@daltonschool.kr wrote:
    I have an image that is in RGB mode, but when I look at
    the channels tab, I am unable to individually select any
    of the channels or click the eye to affect their
    visibility, etc. None of the options at the bottom of
    the channels dialog are available -- all are grayed out.

    I've been googling for solutions, but it's been really
    hard to filter out tons of irrelevant hits. I don't know
    the correct terminology for "clicking the eye" or
    whatever other functions might be performed in the
    channels dialog.

    Does this sound like a familiar problem to anyone?

    You not saved anything to a channel, so no options are
    available.

    First, use the Lasso tool or another method to make a
    selection over some part of your image. That will make
    it so you can see what is happening.

    Go to the Select menu, and towards the very bottom of
    the option list is "Save to Channel". Click on Save
    to Channel, and a new window in the channels dialog will
    show that channel. The display will be monochrome,
    where black is the "unselected" area and pure white is the
    "selected area". Shades of gray indicate feathering.

    Of course then you will get bit with the next similar
    problem... nothing you do to the image does anything
    anymore! That is because you are now editing, not the
    image, but that selected channel with the saved
    selection! So go to the Layers dialog box and click on
    a layer. That puts everything back to "normal".

    If you do that with the Channels dialog and the Layers dialog
    boxes right next to each other it will be very obvious what
    happens. Once you've done the above, you can edit the image
    and change the selection several times, but then get back to
    the one selected by using that dialog box to replace the
    current selection with the save selection (or add/subtract
    etc).

    This can be very useful when you are removing the
    background around a subject. Carefully make a selection
    as tightly as possible around the subject and save it as
    above. Then invert it to select the background, perhaps
    shink it a few pixels, feather it a few pixels, and then
    do whatever you want to it. For example you might do
    that once, and then shink it a large number of pixels
    and apply a huge amount of feathering before using
    gradient fill to wipe out what was there. When done,
    replace the selection with the saved one from a channel,
    and process the original subject in whatever way you
    want to without affecting the new background.

    --
    Floyd L. Davidson http://www.apaflo.com/
    Utqiagvik (Barrow, Alaska) floyd@apaflo.com

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  • From nap@21:1/5 to Floyd L. Davidson on Fri May 12 11:33:57 2017
    Are you talking about the same thing?

    I thought eburton was wondering why he couldn't work with
    the RGB channels; not the selection channels.

    eburton, would you clarify?

    In article <874lwqpb6e.fld@barrow.com>,
    Floyd L. Davidson <floyd@apaflo.com> wrote:
    eburton@daltonschool.kr wrote:
    I have an image that is in RGB mode, but when I look at
    the channels tab, I am unable to individually select any
    of the channels or click the eye to affect their
    visibility, etc. None of the options at the bottom of
    the channels dialog are available -- all are grayed out.

    I've been googling for solutions, but it's been really
    hard to filter out tons of irrelevant hits. I don't know
    the correct terminology for "clicking the eye" or
    whatever other functions might be performed in the
    channels dialog.

    Does this sound like a familiar problem to anyone?

    You not saved anything to a channel, so no options are
    available.

    First, use the Lasso tool or another method to make a
    selection over some part of your image. That will make
    it so you can see what is happening.

    Go to the Select menu, and towards the very bottom of
    the option list is "Save to Channel". Click on Save
    to Channel, and a new window in the channels dialog will
    show that channel. The display will be monochrome,
    where black is the "unselected" area and pure white is the
    "selected area". Shades of gray indicate feathering.

    Of course then you will get bit with the next similar
    problem... nothing you do to the image does anything
    anymore! That is because you are now editing, not the
    image, but that selected channel with the saved
    selection! So go to the Layers dialog box and click on
    a layer. That puts everything back to "normal".

    If you do that with the Channels dialog and the Layers dialog
    boxes right next to each other it will be very obvious what
    happens. Once you've done the above, you can edit the image
    and change the selection several times, but then get back to
    the one selected by using that dialog box to replace the
    current selection with the save selection (or add/subtract
    etc).

    This can be very useful when you are removing the
    background around a subject. Carefully make a selection
    as tightly as possible around the subject and save it as
    above. Then invert it to select the background, perhaps
    shink it a few pixels, feather it a few pixels, and then
    do whatever you want to it. For example you might do
    that once, and then shink it a large number of pixels
    and apply a huge amount of feathering before using
    gradient fill to wipe out what was there. When done,
    replace the selection with the saved one from a channel,
    and process the original subject in whatever way you
    want to without affecting the new background.

    --
    Floyd L. Davidson http://www.apaflo.com/
    Utqiagvik (Barrow, Alaska) floyd@apaflo.com

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