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I would like to allow adjacent apps in my interface glow, overlaying each other with white, but the apps have a 0.25pt black border which I want to avoid diminishing. Is there a blend mode which allows me to apply white to everything except for colors near black?

enter image description here

By the way I'm working with CSS, so the blend modes available are limited:

Not every blend mode has been translated from PhotoShop into CSS: as of this writing, we have access to multiply, screen, overlay, darken, lighten, color-dodge, color-burn, hard-light, soft-light, difference and exclusion,

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    I don't follow your question. What do you mean by "Apply white to everything but black?" What part do you want to glow? – Ryan Aug 12 '15 at 15:35
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Below you can see an example of a blue box with a black stroke, on the right there's a white overlay. You can see that this does not effect the black.

Box with overlay

Therefore, overlay should be the effect you are looking for.

Hope this helps! :)

PS.for future reference on colours, click here.

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    I tested this is InDesign, where Im working on the design mockup, but to no avail. I suspect the CYMK color space may be the problem. – J.Todd Aug 12 '15 at 15:57
  • That's exactly the problem, change to RGB (which is additive) and the overlay will then work :) also, CMYK is for print. You likely don't need this for your app! – Jenna Aug 12 '15 at 16:08
  • Well Yep InDesign is for print so it uses CYMK but I find it useful for making fast web page mockups! – J.Todd Aug 12 '15 at 17:44
  • @ColorQuestor it is indeed for print but has many other uses, e.g online brochures, or even layout and mock ups like you're doing. There's a question here that states how to change the color space :) – Jenna Aug 13 '15 at 19:03
  • Oh great, I didn't know about that, very neat thank you! – J.Todd Aug 13 '15 at 21:13

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