Software for image analysis

[yrana2002]

I am looking for some softwares that could be used for image analysis..
for eg: it could identify how much area of the image may be filled with a particular colour (etc..)

I basically have its need for geographical maps containing various colours that signify different attributes (pop. density, land price, etc.)

[Amitava83]

Photoshop CS3 will do fine.....