Adobe InDesign CC 2015 - Manual (Page 517)

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Transparency
Last updated 6/6/2015
Luminosity Creates a color with the hue and saturation of the base color and the luminance of the blend color. This
mode creates an inverse effect from that of the Color mode.
Note: Avoid applying the Difference, Exclusion, Hue, Saturation, Color, and Luminosity blending modes to objects with
spot colors; doing so can add unwanted colors to a document. For more information, see
Best practices when creating
transparency
Isolate blending modes
When you apply a blending mode to an object, its colors blend with all objects beneath it. If you want to limit the
blending to specific objects, you can group those objects and then apply the Isolate Blending option to the group. The
Isolate Blending option confines the blending to within the group, preventing objects beneath the group from being
affected. (It is useful for objects that have a blending mode other than Normal applied to them.)
It is important to understand that you apply the blending modes to the individual objects, but apply the Isolate Blending
option to the group. The option isolates blending interactions within the group. It doesn’t affect blending modes applied
directly to the group itself.
1 Apply the blending modes and opacity settings to the individual objects whose blending you want to isolate.
2 Using the Selection tool, select the objects you want to isolate.
3 Choose Object > Group.
4 In the Effects panel, select Isolate Blending. (If the option is not visible, select Show Options in the Effects panel
menu.)
You can isolate the blending of objects in a PDF file that contains blending modes. First, place the PDF file with the
Transparent Background option selected in the Place PDF dialog box. Then apply the Isolate Blending option.
Knock out objects within a group
You use the Knockout Group option in the Effects panel to make the opacity and blending attributes of every object in
the selected group knock out—that is, visually block out—underlying objects in the group. Only objects within the
selected group are knocked out. Objects beneath the selected group are still affected by the blending or opacity that you
apply to objects within the group.
It is important to understand that you apply the blending modes and opacity to the individual objects, but apply the
Knockout Group option to the group.