Hexadecimal number string to colour pallette

Question

I have a massive string of hexadecimal numbers. I want to make an image out of this string where each pixel's colour value is defined by (the first, second, third ...) 6-letter strings from this massive string. I'm hoping the image will look something like this: https://i.stack.imgur.com/8jKGx.jpg. Although there will be many more pixels.

I'm a noob when it comes to coding so any help/pointers would be massively appreciated! I've done some tests by entering the hexadecimal values manually into illustrator but it takes far too long.

Input, output, your attempt ... otherwise your post will be closed. — ROMANIA_engineer, Jan 07 '16 at 23:12

score 0 · Answer 1 · edited May 23 '17 at 12:23

0

You should loop through the string, counting by 6, to pull out each individual color. I recommend using python, because you can also use a library to create the image once you have all the values.

Take a look at this question for tips on looping: Iterate over a string 2 (or n) characters at a time in Python

edited May 23 '17 at 12:23

Community

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answered Jan 07 '16 at 23:16

John G

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score 0 · Answer 2 · answered Jan 07 '16 at 23:16

This should work. This will create a BufferedImage with a defined height and width from the string hexString. You can then draw it to a JPanel or save it to a file.

BufferedImage bi = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Graphics2D g = (Graphics2D) bi.getGraphics();
for(int i = 0; i < hexString.length(); i += 6){
    int x = i % width;
    int y = (int) Math.floor(i / width);
    Color hexColor = new Color(Integer.parseInt(hexString.substring(i, i + 6), 16);
    g.drawRect(x, y, 1, 1);
}

Hexadecimal number string to colour pallette

2 Answers2