What exactly is being selected with a luminosity mask or channel mask?

Discussion in 'Photoshop Tutorials' started by dglaser, Jan 24, 2005.

  1. dglaser

    dglaser Guest

    When you command/Ctrl click on a channel or the composite channel, or
    Command-Option-~ or Command-Option-2 - 4, etc. on a layer, a selection
    happens. But what IS this a selection of? It seems to related to the
    channels, because you can get the same selections by Command-clicking a
    channel.

    But what is being selected?

    A luminosity mask or selection happens when you Command-Option-~. This
    is supposed to be a selection of the highlights, which can be inverted
    to make a selection of the shadows. Are the midtones NOT being selected
    in either of these?

    It seems like the selection is composed of all the pixels from 50% -
    100% brightness value (RGB). Is that what is happening?
    Thanks for any help. Dale
     
    dglaser, Jan 24, 2005
    #1
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  2. dglaser

    Tacit Guest

    A luminosity mask or selection happens when you Command-Option-~. This
    The midtones are being partly selected.

    The brighter a part of the image is, the more selected it is. The darker it is,
    the less selected it is. Areas of 50% luminosity are 50% selected.
     
    Tacit, Jan 24, 2005
    #2
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