Instagram , edit and save for 640 x 960 iPhone wallpapers ? Possible ?

hi..
love instagram effects. open photos in instagram , apply filter , save iphone photo gallery , too, should size of source image, without having resize or move picture.

possible ?

also, dont want instagram publish photos publicly, without asking me, can apply filter, save iphone photo gallery , cancel operation.

let me know, if possible .

 

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