I'm looking for a computer software that can transform  a person's
drawing into a particular art style. For instance if I drew a fish and
I want to see how Picasso would have done it in a Cubist style, the
software will use my drawing as a base and then metamorphose it into a
Cubist drawing. Can anybody tell me whether such software exists? And
if it does, how or where can I purchase it from?

Dear Goyle

The answer to this question is not simple. If you want to do serious
work with computer-generated graphics, there is a lifetime of study
and work ahead. The best software is very costly, and the same goes
for the hardware you need. And the software takes very, very long to
master. That said, I will try my best to point you in the right
directions.


<<
I'm looking for a computer software that can transform a person's
drawing into a particular art style. For instance if I drew a fish and
I want to see how Picasso would have done it in a Cubist style, the
software will use my drawing as a base and then metamorphose it into a
Cubist drawing. Can anybody tell me whether such software exists?
>>

As Pepitodevilboy comments, art is not all about colors and textures.
All the software mentioned in the comments are software that will take
a drawing, shift the pixels slightly, maybe smudge them, add textures
etc. An example: If you scan a drawing you have made of a house, and
import that into a graphics package, then there is no software in the
world that can show what the back side of that house looks like.

But if you just want to soften the colors, tone them, wash them, or
maybe add textures of paper, or canvas, wood etc, then most any
Graphics Package will do the job. Personally I use Photoshop for such
work. Open photoshop, import (or scan) you graphics, and then look
under Filter --> Artistic -->
There you will find several filters that can simulate Watercolors,
Fresco etc.

(Photoshop is available from
http://www.adobe.com
- or most any software store in the world.)

But this software can only simulate, not create. If you want to create
images and work with perspectives like an artist would, then you need
a 3D package. There are many 3D programs, some simple, some complex,
and some of them very expensive. If you are a student, you will get
student discounts for the professional ones, like Maya and 3D Studio
Max.

Here are their respective homepages:
http://www.aliaswavefront.com
http://www.discreet.com

If you are serious about this question, and you plan to use both time
and resources on it, then one of the most rewarding aspects of working
with computers is 3D graphics. (You have to remember that this
software is the same stuff they use to make Hollywood blockbusters
like Jurrasic Park, Monsters Inc. etc.) There have been developed
techniques like Toon Shading, which techniques that are very close to
your question: how to recreate artistic styles, working with textures,
watercolor filters - and since it is 3D, it includes working with
perspectives.

Good luck!

Have you looked at Painter 7.0? I haven't seen a working version of
this software since version 4, but it had some of the features you're
looking for.
You have to put up with a Flash module on the website but it is:

http://www.procreate.com/product/painter7/

Good luck and hope that helps.

I'm not quite sure if you know what cubism really is, cubism is
showing an object from multiple perspectives, it's not simply drawing
everything as a cubes, but if what you want is a program that will
make something you drew into cubes there is a program called "the
gimp" its a free open-source program, you can download it at
www.gimp.org

Art Ideas
http://www.greece.k12.ny.us/taylor/topics/artideas.htm
"Use a program like Print Shop or Paint Shop to enhance scanned
student-work. Drawings and paintings in the student's own style can be
transformed into Impressionist, Pointillist or Cubist works. Some
programs simulate a variety of media - crayon, watercolor, oils, etc."

You can download free trial/demo versions of such image-manipulation
software at the following sites:

Paint Shop Pro (PC)
http://www.jasc.com/download_4.asp

Print Shop Deluxe 6.0  (PC)
http://www.pcworld.com/downloads/file_description/0,fid,5323,00.asp

See also -- Adobe, including Photoshop  (PC and Mac)
http://www.adobe.com/products/tryadobe/main.jhtml#product=39

Another such program is CorelDRAW's "Art Strokes Effects" which "turn
your images into drawings, paintings, watercolors, etc. Some of the
effects include Charcoal, Crayon, Cubist and much more."  Corel makes
the  Painter 7.0 program (mentioned by vir-ga) so no doubt the effects
would be similar. Here's a tutorial on Applying the Cubist Effect, to
give you an idea of how it might work:
http://howto.lycos.com/lycos/step/1,,10+57+36407+36573+36578,00.html 
I've not had much luck with a free trial download for Corel products
except for patches and updates, however.

Finally, here's a shareware program for transforming photographs (not
artwork) that might interest you:
Professor Franklin's Instant Photo Artist 1.04
http://tucows.com/mmedia/preview/282436.html
Evaluation: 30 days  
($29.95 to keep) 
"This amazing and innovative program lets you take ordinary photos and
turn them into works
of art. Whether you prefer Impressionist paintings, charcoal sketches
or watercolors,
this software can help.  Just select a photo, choose your style and
painting implement and
drag your mouse over the outline of your photo.  You determine the
size, direction, style and
pressure of your mouse-strokes. Select from a gallery of painting
styles or choose a tool and
brush shape to create your own."