imagergbmogrify

How to convert BMPs to RBG JPEGs

I have a directory of BMP images. All the images are represented in the RGB color space, though some only actually contain black and white.

I need to convert the BMP to JPG images. All the JPG images also have to be in the RGB color space.

I ran

mogrify -format jpg *.bmp

This creates JPG images for each of my BMPs. However, the BMPs that contain just two colors end up as grayscale JPGs instead of RGB. I also tried

mogrify -format jpg *.bmp -colorspace RGB

and got the same thing.

How do covert a set of BMPs to JPGs and force the RGB color space?

macOS 10.15.7

Solution

  • Nevermind. It's easy with Pillow.

    #!/usr/bin/env python

from PIL import Image
from pathlib import Path

import sys

for filename in Path(sys.argv[1]).glob("*.bmp"):
    Image.open(filename).save(filename.with_suffix(".jpg"))