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Photo-Based Art Emulating natural-media painting techniques

Posterizing, Posterization thoughts and ideas

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  #1  
Old 06-04-2002, 12:56 AM
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Posterizing, Posterization thoughts and ideas

I've been fiddling with a few ideas of my own, and it seems to me that many from-scratch art techniques would need to start with some sort of posterization.

I'm wondering if there isn't some technique where you can not only posterize an image, but each posterization level would be put on its own layer. This would be a good starting point for many possible art techniques.
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Old 06-04-2002, 01:55 AM
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Re: Posterizing

it seems to me that many from-scratch art techniques would need to start with some sort of posterization.

By "from-scratch" - do you mean in the tradtional sense or starting form a photo?

I'm wondering if there isn't some technique where you can not only posterize an image, but each posterization level would be put on its own layer. This would be a good starting point for many possible art techniques.

What do you mean by "each posterization level"? (Not knowing THAT much about posterization, I'm already lost. )

I think I agree that it's a good starting point for art techniques. In fact, the palette knife creates posterization to some effect - esp. if you use a large brush size and little detail - which is why I find myself starting with that filter quite often.

Jeanie
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Old 06-04-2002, 02:57 AM
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Posterization is taking a continuous tone image and breaking it down into X tones (you specify X).

It seems that if you had your image simplified to X tones, you could then alter those tones to fit the color pallette you had in mind, and if each of those tones were on separate layers they could be treated, in effect, as paints, and had various things done with them to seem brushlike.

As an experiment take a photo and posterize it to 3 or 4 tones (it will look really bad this simple, but this is an experiment). Now select each tone using magic wand on non-contiguous and paste it to a new layer. Turn off your original image. Things should look roughly as they did before you did the selections (although even at this point some creative effects are possible). Now fiddle with the hue/sat of each layer and try some filters (I was playing with 'crystalize' and 'motion blur', but many others would be interesting).

I was thinking you could control the amount of overlap, leaving white spaces between some sections and having others on top of each other. Many other controls are available once you've deconstructed a photo to this point.

I'm sure many paint filters do very sophisticated versions of this, along with a lot of other things, but would not offer this level of control and personalization.
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Old 06-04-2002, 03:58 PM
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Good - I THOUGHT that's what you were saying, but wasn't sure. I do think having each color on a separate layer would allow for a LOT of control over the final image - even deciding if you want some colors to overlap others. Very interesting thought, but my experiments will have to wait until my next allotted "play time."

Jeanie
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Old 06-04-2002, 04:17 PM
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I think you've got something there Doug. I haven't really tried much in the way of "art", but like you, I think posterization would make things much simpler.

Ed
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Old 06-04-2002, 06:45 PM
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You could vectorize the image using a program like Corel Trace. Then just select the shapes of the same color, group them together and export back out as a bitmap. Repeat for each color and then pull the seperate files into photoshop as it's own layer.

Of course, this would take a great deal of time and probably would not achieve a very good result...but it works in theory!
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Old 06-04-2002, 07:49 PM
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Greg:

That was actually the thinking that led me to the experiment that in turn led to this post. I thought that if individual poster tones could be vectorized, then all sorts of possibilities would surface. But then I actually tried it, and I crashed and burned real fast

My problem is the tracing routines disregard the subject, which the artist cannot. I had visions of millions of tiny vectored brushstrokes, each of which could be rotated, skewed, etc., to emulate individual brush strokes. But all I ended up with was mush.
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Old 06-04-2002, 11:34 PM
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Not so automatic action

This concept piqued my interest so I took a stab at buiding an .ATN.

In a nutshell the grayscale tone or color of interest is selected using the Eyedropper tool... then the action invokes the SELECT/COLOR RANGE function to create a selection, which is used against the base posterized layer to create a new layer.

It's a "select 1 color/tone at-a-time" process, but once you get on a roll it goes pretty fast. The number of individual layers needed to recreate an original color posterized layer is a function of how liberal one is with the Select/Color Fuzziness slider. Fewer iterations were needed for grayscale images.

Seems to work OK on color or grayscale images. To me grayscale seemed to generate better results because there are fewer tone variations. (I started with a posterization of 5 levels. Your mileage will vary.)

It's non-destructive and operates against the active (posterized) layer.

Here's the action if anyone wants to try it.

The unmowed lawn will wait another day. Thanks for the inspiration (again), Doug...

~DannyR~
Attached Files
File Type: zip isolate posterized layers.zip (1.2 KB, 100 views)
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Old 06-05-2002, 11:23 PM
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Danny - Just in case you're wondering, I downloaded your action last night, I just haven't had a chance to actually DO anything with it yet! I'm anxious to try it though...
Jeanie
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Old 06-05-2002, 11:27 PM
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I guess I'll save my idea about using posterization as a start for sculpture for another day (got to let Danny get his lawn done )
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