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Support for Including Metadata in images converted to base64 #54

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Support for Including Metadata in images converted to base64 #54

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41 changes: 33 additions & 8 deletions sdkit/utils/image_utils.py
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Original file line number Diff line number Diff line change
@@ -1,22 +1,47 @@
import base64
import re
import json
import piexif
import piexif.helper
from io import BytesIO
from PIL.PngImagePlugin import PngInfo


# https://stackoverflow.com/a/61114178
def img_to_base64_str(img, output_format="PNG", output_quality=75, output_lossless=False):
buffered = img_to_buffer(img, output_format, output_quality=output_quality, output_lossless=output_lossless)
def img_to_base64_str(img, output_format="PNG", output_quality=75, output_lossless=False, metadata=None):
buffered = img_to_buffer(img, output_format, output_quality=output_quality, output_lossless=output_lossless, metadata=metadata)
return buffer_to_base64_str(buffered, output_format)


def img_to_buffer(img, output_format="PNG", output_quality=75, output_lossless=False):
def img_to_buffer(img, output_format="PNG", output_quality=75, output_lossless=False, metadata=None):
buffered = BytesIO()
if output_format.upper() == "PNG":
img.save(buffered, format=output_format)
elif output_format.upper() == "WEBP":
img.save(buffered, format=output_format, quality=output_quality, lossless=output_lossless)
if metadata:
if output_format.upper() == "PNG":
embedded_metadata = PngInfo()
for key, val in metadata.items():
embedded_metadata.add_text(key, str(val))
img.save(buffered, format=output_format, pnginfo=embedded_metadata)
else:
user_comment = json.dumps(metadata)
exif_dict = {
"Exif": {
piexif.ExifIFD.UserComment: piexif.helper.UserComment.dump(user_comment, encoding="unicode")
}
}
exif_bytes = piexif.dump(exif_dict)
if output_format.upper() == "WEBP":
img.save(buffered, format=output_format, quality=output_quality, lossless=output_lossless, exif=exif_bytes)
else:
img.save(buffered, format=output_format, quality=output_quality, exif=exif_bytes)
else:
img.save(buffered, format=output_format, quality=output_quality)
if output_format.upper() == "PNG":
img.save(buffered, format=output_format)
elif output_format.upper() == "WEBP":
img.save(buffered, format=output_format, quality=output_quality, lossless=output_lossless)
else:
img.save(buffered, format=output_format, quality=output_quality)


buffered.seek(0)
return buffered

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