Bicubic scaling layer mask leaves 1-pixel border

when resizing layer layer mask , using bicubic method, layer maks scales 1 pixel differently other layers. normal due component of bicubic interpolation or bug?

 

try following:

create new image in photoshop @ 800 px x 800 px

leave locked bg layer , create new layer

fill new layer green (or favorite color)

add layer mask green layer , fill mask black (via fill foreground color or alt+del) remove visible green document

now use image-> image size (opt+cmd+i) resize document using bicubic scaling method. resize 600 px 600 px.

 

now zoom in on document's edge @ pixel level. white should be?

in case, no. however, if use 'nearest neighbor' interpolation method when scaling, solid white edge. more strange, if fill layer mask black inverting rather filling problem not happen.

 

any ideas?

well, normal photoshop , has been mentioned several times, example:

 

http://forums.adobe.com/message/4556367#4556367

 

you'll see 1-pixel border of layer have become transparent (or more transparent if semi-transparent).

 

i can give action make border of layer opaque if you're interested.

 

even more strange, if fill layer mask black inverting rather filling problem not happen.

 

i didn't realize that; don't think i've ever used fill make mask 1 solid shade. pointing out. extremely strange!

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