Advice please

[B19YBT]

Hi guys, im currently using photoshop cs2, ive been out at the weekend at a car show and been shooting some shots. I have good skies in the shots but want the clouds to look darker,more moodier,but without darkening the whole picture. And maybe make the blues darker, Could anyone give me some advice or help on how to do this in photoshop, baring in mind im quite new at this lol :lol:

http://i472.photobucket.com/albums/rr85/B19YBT/IMG_1134.jpg

Also been reading a few threads on here and seen ' vignette ' mentioned, what does this mean ?

Cheers :)

[PhotosGuy]

Adjustment Layers are one answer:
Airport runway shoot (http://photography-on-the.net/forum/showthread.php?t=117950)

Masks & Blend Modes are another:
For those needing help making selections in Photoshop (http://photography-on-the.net/forum/showthread.php?t=701268)

'vignette' means darkening the outside edges.

[rikaro]

If you're just starting to use PS. I wouldn't get too technical. Just use the burn brush tool and darken the sky :P

Not the best way but it does the job right.