How to replace colors in BufferedImage in JAVA

Question

I\'m wondering if there is a more efficient method for replacing colors in a BufferedImage. At the moment I use the following method:

I fill an array with colors to

Answer 1

Instead of changing the value of the image pixels you can modify the underlying ColorModel. Much faster that way and no need to iterate over the whole image so it scales well.

Answer 2

It looks like the idiomatic way to do this is to implement a LookupOp and then apply this operation to create a new target BufferedImage. There is a great answer here.

Answer 3

Use a HashMap<Color,Color>. The key should be the original color, and the value the replacement. If the get returns null, do nothing.

Answer 4

Have a look at BufferedImageFilter/BufferedImageOp to filter your image in the producer/consumer/observer paradigm.