Question

Can’t figure out why the document profile is being changed on a crop, scale and save with PIL. Have tested with an image that had sRGB as color profile, and after it has untagged RGB.

def scale(self, image):
    images = []

    image.seek(0)

    try:
        im = PIL.open(image)
    except IOError, e:
        logger.error(unicode(e), exc_info=True)

    images.append({"file": image, "url": self.url, "size": "original"})

    for size in IMAGE_WEB_SIZES:
        d = cStringIO.StringIO()
        try:
            im = crop(image, size["width"], size["height"])
            im.save(d, "JPEG")
            images.append({"file": d, "url": self.scale_url(size["name"]), "size": size})
        except IOError, e:
            logger.error(unicode(e), exc_info=True)
            pass

    return images

I am trying to get PIL to save the scaled version with the same colour profile that the original image has.

EDIT: According to this it should be possible http://comments.gmane.org/gmane.comp.python.image/3215, but still not working for me using PIL 1.1.7

Answer 1

PIL has a function to read the icc_profile and also a way to save with icc_profile. So what I did was to open the file to get the icc_profile:

try:
    im1 = PIL.open(image)
    icc_profile = im1.info.get("icc_profile")

And the add it to the file again on save:

im.save(d, "JPEG", icc_profile=icc_profile)

And the full code:

def scale(self, image):
    images = []

    image.seek(0)

    try:
        im1 = PIL.open(image)
        icc_profile = im1.info.get("icc_profile")
    except IOError, e:
        logger.error(unicode(e), exc_info=True)

    images.append({"file": image, "url": self.url, "size": "original"})

    for size in IMAGE_WEB_SIZES:
        d = cStringIO.StringIO()
        try:
            im = crop(image, size["width"], size["height"])

            im.save(d, "JPEG", icc_profile=icc_profile)
            images.append({"file": d, "url": self.scale_url(size["name"]), "size": size})
        except IOError, e:
            logger.error(unicode(e), exc_info=True)
            pass

    return images

I have tested with both tagged (with icc profile) and untagged jpeg images.