How to created a 'pixelated gradient'?

I've got very similar question (noob) : want to create a mosaic pattern with three colors gradient from solid bottom to white top with mostly white from the middle on - also something like a stock photo I saw but with red gray and white - have already worked out how to do a total mosaic using two colors from http://robertsproductions.net/photoshop-mosaic-pattern/http:// but got stuck with (1) how to combine a gray and red version together and (2) how to apply a gradient to get them to fade out from mid screen ... any sugestions most appreciated!

I have a similar project. I want to create a gradient of pixels exploding outwards. Sort of what Monika did, but actually using squares instead of a path. I just want to apply a radial gradient with mosaic look to this:

I would do this differently,

is this something what u trying to do?

If it is:

1.    draw a square: 10mm x 10mm (for the purpose of this explanation)

2.    Fill it with a 1(+1) colour gradient ( and a tint of that colour) you dont have to but end results better.

3.    Then drag it into the symbols panel. (graphic when asked)

4.    select the square on the art board (which is now a symbol)

5.    then effect>distort and transform>transform

6.    change the reference point to top left

7.    copies 25, move horizontal 10mm, click ok

8.    then effect>distort and transform>transform again and yes to apply new effect

9.    change the reference point to top left

9.    copies 25, move vertical 10mm, click ok

10.    Then: object>expand appearence

11.    Right click on object and ungroup TWICE

12.    then select the symbol screen (or stainer) tool (play around with then and settings till u happy)

13.    drag over the object.

G

Create a gradient structure in Photoshop or a gradient mesh or a gradient.

Convert to pixel (rasterize) if necessary

Object > Create Object mosaic, enter desired number of pieces

to convert to 2 colors, use Edit > Edit colors > Recolor art

People call it "dithering" and once you look up the term on teh web, it becomes clear that it's just a matter of defining patterns to mimic optical density. Ergo, the process would involve using fill patterns, pattern brushes or similar to quickly create such structures in AI as well. If that's not possible because the designs exist in some fixed form as a multitude of small squares already, then indeed filling them individually is pretty much all you can do. In part it may also be possible to use combinations of live trace and the convert to mosaic function, though...

Mylenium