c# - Is it possible to set a border to overlay (like in photoshop) -


i having quite exotic question: working on "borderless" wpf application. removed standard windows window controls , added own. wanted add border programm. don't want border have specifc color, want in kind of overlay mode when set layer in photoshop overlay. can see mean in example:

photoshop mookup

i want on left. unfortunately have no idea how. overlay takes background color , makes bit darker. have suggestions do?

edit: here better picture of effect

photoshop mookup2 http://img.xrmb2.net/images/243147.png

edit2 : so, short explanation because may not clear have hoped: not talking semi-transparency. know how that. right box in both images uses that. has black-semitransparent look. while on left set border "overlay" mode. can see gets darker bit stronger in color.

how using transparent brush?:

<border borderbrush="transparent" borderthickness="5">     ... </border>

update >>>

oh, hold on... see want... try instead semi opaque `brush:

<border borderbrush="3f000000" borderthickness="5">     ... </border>

you can adjust darkness of border, changing first 2 hexadecimal characters: 3f.

update >>>

i believe is correct solution. said last:

you can adjust darkness of border, changing first 2 hexadecimal characters

so try different values until right balance of opacity. start hardly visible black , increase opacity until right:

<border borderbrush="08000000" borderthickness="5">     ... </border> ... <border borderbrush="0f000000" borderthickness="5">     ... </border> ... <border borderbrush="1f000000" borderthickness="5">     ... </border> ... <border borderbrush="2f000000" borderthickness="5">     ... </border>

if none of these values quite right still, use semi-opaque white instead:

<border borderbrush="2fffffff" borderthickness="5">     ... </border>

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