riddle - The Gnosis questions(3)

This is the third question of the series: The Gnosis questions

"Link a phrase which means being depressed,
A phrase which means propitious future,
Something utilizing the phenomenon which results when film is exposed for a long time,
And the scientific process by which liquids(or gases) turn to solids.

"
Who am I?

Edit: It was not grasses, but gases. Apologies...

Note: Who am I ?

Hint:

1. He is or rather 'was' a famous personality in his field of work.
2. All these four lines fetch one(or two) word each, and are his famous work.

Answer

I think I've got it this time.

You are

Pablo Picasso

a phrase which means being depressed

feeling blue: Picasso's blue period

A phrase which means propitious future,

looking rosy: his Rose period

Something utilizing the phenomenon which results when film is exposed for a long time,

the only thing i can think of here is Light Painting, a technique which uses long exposure photography, and of course picasso was a painter

And the scientific process by which liquids(or gases) turn to solids.

crystallization: his Crystal period