How do I use ImageMagick to create one color pictures?

[Petty]

Hi all,

i would like to create pictures with a few colors in command shell. Actually i am going to build a Website with some personal pictures.But i dont want to put the pictures with full colors. i need one or two colors.
For examp. like my avatar.

Thanks

[anthony]

See IM Examples, Color Reducion and dithering.
http://www.imagemagick.org/Usage/quantize/

[Petty]

i coundn't make it
Can u guys give an Example?Please, It so complicated.

Thanks.

[anthony]

More information would be nice...
What type of image? real world? Cartoon like? Shaded? greyscale?
Do you have an example image? What sort of colors do you want? How many?

what have you tried? Have Tried something like...

Code: Select all

convert image.png   +dither -colors 4 image_4.png

And no color reduction is typically not easy, as you have lots of techniques and options.
The IM examples page refered to however has lots of simple examples.
Try them, or explain exactly what you are wanting more clearly.

[Petty]

Sorry for my poor English
I going to try to describe more deeply.
I have normaly (suitable for a documents) taking photos with digital camera. it has full colors. Now i want to change this photos as same as my avatar.(all colors fade and blue color light dominant)
I did made this photo with photoshop, but i have to many (round 300) photos and i dont want to waste my time doing that each one.

Thanks alot.

[anthony]

I see. First resize your photo. See IM Examples, Thumbnails
http://www.imagemagick.org/Usage/thumbnails/

Then I would try a number of methods to find a good way to tint it blue. I would like to see what findings are for this, so an example and commands you tryed may be nice. Right it up for IM examples
Some methods I can think of off hand include...

• make image greyscale then
  • try various histogram adjustments (linear, mathematical equasions, curves)
    http://www.imagemagick.org/Usage/color/#linear
  • use -tint with a blue -fill
  • -flatten it with a a blue -background
• use -sepia-tone, then
  • change the color hue using -modulate
  • greyscale and try the previous greyscale tinting options
• Just try to directly tint the image

Again, write up what you fine, I'll include it into IM Examples, Color Modifications, for others to use.