def create_image_instance(data: str, is_local=True) -> Union[None, Image]:
try:
# Read images and get dominant colors
cv_image = get_cv_image_from_b64str(data)
cv_image = scale_cv_image_to_max_dim(cv_image, MAX_DIM)
dominant_colors_bgr = get_n_dominant_cv_image_colors(cv_image, DOMINANT_COLORS)
dominant_colors_hsv = [ bgr_to_hsv(color[0], color[1], color[2]) for color in dominant_colors_bgr ]
# Detect white-black-gray colors. If they are not the only dominant, then just set that
# hue to some unreachable value, so they are never reached when querying the database.
# If they are the only colors though, then we just skip adding this image
only_boring = True
hues = []
for i in range(len(dominant_colors_hsv)):
r = dominant_colors_bgr[i][2]
g = dominant_colors_bgr[i][1]
b = dominant_colors_bgr[i][0]
if is_boring_rgb(r,g,b, BORING_MARGIN):
hues.append(10000)
else:
only_boring = False
hues.append(dominant_colors_hsv[i][0])
if only_boring:
return None
# Compress jpeg bytes
byte_array = get_cv_image_as_jpeg_bytes(cv_image)
compressed_bytes = compress_bytes(byte_array)
# And finally save it in the database, while doing some Django trickery for saving in-memory binary data
image = Image(is_local=is_local)
image.file = ContentFile(compressed_bytes)
image.file.name = str(uuid.uuid4()).replace('-', '') + '.lzma'
for i in range(len(hues)):
setattr(image, f'hue{i+1}', hues[i])
return image
except:
pass
return None
