How to Batch Convert Filenames from Decimal to Hex Color Codes?

Question

I asked this question first over on Graphic Design... Since then I was able to learn; and to utilize the fact that a program I was unfamiliar with (ImageMagick) has the capability to output RGB values to the filename using the following:

magick *.png -set colorspace RGB -set filename:f "%[pixel:p]" %[filename:f].png

So I took that step and it worked. Fast forward to the asking of this question here. I have a folder full of image files made up of a single color. I was able to use ImageMagick as shown above to change the filenames to correspond with the colors contained in the respective images. Here is a screenshot from inside the folder:

My only question is: How can I convert the filenames from decimal form to hex?

So, for example, I would like the names of the files to be changed from "rgb(13,12,12).png" to the corresponding hex color code: "0D0C0C.png"

This is turning out to be more difficult than I had hoped... A Windows cmd script or a BAT I could run would be ideal. Can anyone here possibly help me to pull this off?

• I am on Windows 10 and I have installed GOW (GNU On Windows) which affords me the following *nix tool listed here.
  Editor's note: The list includes the following programs that (IMO) might be useful: sed, bash, bc, dc, expr, printf (and, of course, mv) — but, notably, not awk.

Answer 1

With Powershell, you could:

• use "rgb(13,12,12).png" -replace "rgb(","" to strip the first four
• use "13,12,12).png" -replace ").png","" to strip the closing
• use "13,12,12" -split "," to separate the pieces
• use "{0:x}" -f 13 to convert 13 to hex

This should get you started.

If you get stuck on a particular part of this, you can update your question.

Answer 2

Your question doesn't specify what kind of script you want to do this with. You can use python:

import os

for filename in os.listdir('<your-directory>'):
    if filename.endswith('png'):
        rgb = filename.strip('rgb(').strip(').png').split(',')
        hex = [format(int(c), '02x') for c in rgb]
        new_filename = ''.join(hex) + '.png'
        os.rename(filename, new_filename)

This assumes that all the png files in that directory are in the format you specified.