Fill opacity influence on blendmodes?

Discussion in 'Photoshop' started by Trickster, May 5, 2005.

  1. Trickster

    Trickster Guest

    I've been trying to find information on how fill opacity controls the
    different blendmodes, but all relevant topics seems to stop where it
    gets interesting :-S (note: I'm not asking about the general purpose of
    the Fill opacity.. I understand how it works with layer fx)

    As you may or may not have discovered, the fill opacity slider have a
    different influence than the normal opacity slider.

    But this seems only to be true for some blendmodes.
    Color Burn/Dodge
    Linear Burn/Dodge
    Vivid Light
    Linear Light
    Hard Mix
    Difference

    In the rest of the blendmodes it seems that Fill Opacity and normal
    Opacity controls is similar.

    So the mysterious question is: why is there differences in the way Fill
    Opacity controls the blendmode?
    Moreover, what I'm really interested in, is wether there's a general
    pattern or system behind this behaviour?

    It doesn't seem to follow the blendmode categorizations or technical
    properties (is the mode symmetrical, assymmetrical etc. see
    http://www.pegtop.net/delphi/blendmodes/)

    Is there anyone out there who knows the whats going on with blendmodes
    and fillopacity?
     
    Trickster, May 5, 2005
    #1
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  2. Trickster

    neon Guest

    it's my understanding based on experience and the ps manual & help that
    fill opacity affects pixels painted or shapes drawn on a layer. to
    quote: "Fill opacity affects pixels painted in a layer or shapes drawn
    on a layer without affecting the opacity of any layer effects that have
    been applied to the layer". in other words: fill opacity affects only
    pixels painted or drawn on a layer. seems pretty straightforward to me.
    or am i not understanding the question?
     
    neon, May 5, 2005
    #2
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  3. Trickster

    Trickster Guest

    Yeah well thats exactly what I didn't ask ;) ... its straightforward as
    you say... try the following, then you'll understand what I mean:

    Create an image with two layers (two different photographies or
    something with good color variance and difference btwn the layers).
    *Don't* put any layerstyles on any of the layers.

    Set the foreground blendmode to one of the modes I mention (e.g.
    hardmix or difference),
    now first check how the normal opacity slider affects the blending (it
    just lowers the opacity), then set it back to 100% and try the fill
    opacity in the same manner
    now you'll see that the lowering of opacity is quite different!

    follow?
     
    Trickster, May 5, 2005
    #3
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