62 lines
1.8 KiB
Python
62 lines
1.8 KiB
Python
import math
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from PIL import Image
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from .upscaler import upscale
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UPSCALE_PIXEL_THRESHOLD = 1
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DOWNSCALE_PIXEL_THRESHOLD = 1
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def maybe_upscale(original, megapixels=1.0):
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original_width, original_height = original.size
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original_pixels = original_width * original_height
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target_pixels = megapixels * 1024 * 1024
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if (original_pixels < target_pixels):
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scale_by = math.sqrt(target_pixels / original_pixels)
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target_width = original_width * scale_by
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target_height = original_height * scale_by
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if (target_width - original_width >= 1 or target_height - original_height >= UPSCALE_PIXEL_THRESHOLD):
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print("Upscaling...")
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upscaled = upscale(original)
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print("Upscaled size:", upscaled.size)
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return upscaled
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print("Not upscaling")
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return original
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def maybe_downscale(original, megapixels=1.0):
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original_width, original_height = original.size
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original_pixels = original_width * original_height
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target_pixels = megapixels * 1024 * 1024
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if (original_pixels > target_pixels):
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scale_by = math.sqrt(target_pixels / original_pixels)
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target_width = original_width * scale_by
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target_height = original_height * scale_by
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if (original_width - target_width >= 1 or original_height - target_height >= DOWNSCALE_PIXEL_THRESHOLD):
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print("Downscaling...")
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target_width = round(target_width)
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target_height = round(target_height)
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downscaled = original.resize(
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(target_width, target_height), Image.LANCZOS)
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print("Downscaled size:", downscaled.size)
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return downscaled
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print("Not downscaling")
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return original
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def ensure_resolution(original, megapixels=1.0):
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return maybe_downscale(maybe_upscale(original, megapixels), megapixels)
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