background-replacement / image_utils.py
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import math
from PIL import Image
from upscaler import upscale
UPSCALE_PIXEL_THRESHOLD = 1
DOWNSCALE_PIXEL_THRESHOLD = 1
def maybe_upscale(original, megapixels=1.0):
original_width, original_height = original.size
original_pixels = original_width * original_height
target_pixels = megapixels * 1024 * 1024
if (original_pixels < target_pixels):
scale_by = math.sqrt(target_pixels / original_pixels)
target_width = original_width * scale_by
target_height = original_height * scale_by
if (target_width - original_width >= 1 or target_height - original_height >= UPSCALE_PIXEL_THRESHOLD):
print("Upscaling...")
upscaled = upscale(original)
print("Upscaled size:", upscaled.size)
return upscaled
print("Not upscaling")
return original
def maybe_downscale(original, megapixels=1.0):
original_width, original_height = original.size
original_pixels = original_width * original_height
target_pixels = megapixels * 1024 * 1024
if (original_pixels > target_pixels):
scale_by = math.sqrt(target_pixels / original_pixels)
target_width = original_width * scale_by
target_height = original_height * scale_by
if (original_width - target_width >= 1 or original_height - target_height >= DOWNSCALE_PIXEL_THRESHOLD):
print("Downscaling...")
target_width = round(target_width)
target_height = round(target_height)
downscaled = original.resize(
(target_width, target_height), Image.LANCZOS)
print("Downscaled size:", downscaled.size)
return downscaled
print("Not downscaling")
return original
def ensure_resolution(original, megapixels=1.0):
return maybe_downscale(maybe_upscale(original, megapixels), megapixels)
def crop_centered(image, target_size):
original_width, original_height = image.size
target_width, target_height = target_size
left = (original_width - target_width) / 2
top = (original_height - target_height) / 2
right = (original_width + target_width) / 2
bottom = (original_height + target_height) / 2
return image.crop((left, top, right, bottom))