How to transparent section?

It would be pretty simple to modify the (any) filter to do that, but the blending isn't gonna work out unless you literally have a straight flat landscape that you want to put fake clouds above, or you have already removed the background and it's all white where the fake clouds/sky should go.

Otherwise you'd have to do it in Photoshop or Gimp or Corel ? Using whatever technique works to do partial layering or masking and layering like that. Could be as easy as using the magic wand (in Photoshop) to select the 'top half' of your picture, then run the cloud filter on just that area.

jffe

Mock Up Filter

^ Grab that, and ins ert it into the clouds filter (or any that you want to use) and just plug everything fr om that (clouds or whatever) filter, in to the Profile Gradient (color 2) wh ere the Blocks module is now (and then delete it, it's just a placeholder to illustrate). Then plug that into the "Result" module and then close/save the filter, and you should see clouds (or whatever) up top. You can alter the height with the threshold slider, from 75% sky to 25% sky.

To clarify, copy everything but the "Result" module and paste it in to the clouds filter, that's what I mean by *insert* it, just right click and draw a lasso-box around it all then right click *copy* and open the clouds filter to paste it in.

jffe

Best of luck. I'd suggest opening/editing some filters you like, see how "it's done", and go from there.

jffe