Portrait Image change to Landscape image with black edges

first not want crop image down

i change portrait image landscape image in 4:3 ratio black edges whole portrait image still being used in landscape style.

i have digital picture frame display these pics on , stupid thing displays portrait images fluro blue down sides not complement pics @

i happy try lightroom or photoshop, suggestions?

i doing in photoshop.

open new 'document' 4:3 (eg. 1920x1440pixels) black background. (save ps 'preset' or black 4x3 photo in lr)

open 'portrait' image in ps (from lightroom- ctrl+e) , drag "move tool" onto black 4:3 document.

use transform [ctrl+t] resize , fit on 4:3 document. (hint: see transform frame press [ctrl+zero]. )

save jpg digital screen.

if black 4x3 background in lr, select both background , image , [open layers in photoshop]

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