Heic to jpg conversion - jpg looks too dark

[Torashin]

I've spent too many hours trying to get a heic to jpg conversion script working, and pillow-heif has so far been the only package that seems to actually work on Windows. However, the resultant files don't look the same as the original heics - it's like the gamma is lower. Possibly a HDR to SDR conversion issue. The original files are from an iPhone.

I get the same results with the following:

def convert_heic_to_jpeg_old(file_path, QUALITY=90):
register_heif_opener()
with Image.open(file_path) as img:
jpeg_path = os.path.splitext(file_path)[0] + '.jpg'
#img = ImageOps.exif_transpose(img)
icc_profile = img.info.get('icc_profile')
img.save(jpeg_path, 'JPEG', quality=QUALITY, icc_profile=icc_profile)

and

def convert_heic_to_jpeg(file_path):
jpeg_path = os.path.splitext(file_path)[0] + '.jpg'
heif_file = pillow_heif.open_heif(file_path, convert_hdr_to_8bit=False, bgr_mode=True)
np_array = np.asarray(heif_file)
cv2.imwrite(jpeg_path, np_array).

Can someone please halp?

Here's a screenshot of an example image pair (it won't upload heic files). Source files have a bit depth of 32.

[Torashin]

Actually, it looks like its just the windows image viewer being shit. They look the same on Mac.