-- Export an existing three-cell pose strip without changing its native pixels.
local source=app.open(app.params.source)
local strip=Image(source.cels[1].image)
app.command.SpriteSize{ui=false,width=source.width*3,height=source.height*3,method='nearest-neighbor'}
source:saveAs(app.params.sheet)
source:close()
local gif=Sprite(48,64,ColorMode.RGB)
local order={0,1,2,1,0}
local durations={0.65,0.12,1.0,0.12,0.3}
for i,col in ipairs(order) do
 if i>1 then gif:newFrame() end
 local frame=Image(48,64,ColorMode.RGB)
 frame:drawImage(strip,Point(-col*48,0))
 gif.cels[i].image=frame
 gif.frames[i].duration=durations[i]
end
app.command.SpriteSize{ui=false,width=144,height=192,method='nearest-neighbor'}
gif:saveAs(app.params.preview)
gif:close()