31 lines
1.1 KiB
Python
31 lines
1.1 KiB
Python
from PIL import Image
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def shrink_and_paste_on_blank(current_image, mask_width, mask_height, opacity=1):
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"""
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Decreases size of current_image by mask_width pixels from each side,
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then adds a mask_width width transparent frame,
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so that the image the function returns is the same size as the input.
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:param current_image: input image to transform
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:param mask_width: width in pixels to shrink from each side
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:param mask_height: height in pixels to shrink from each side
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"""
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# calculate new dimensions
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width, height = current_image.size
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new_width = width - 2 * mask_width
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new_height = height - 2 * mask_height
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# resize and paste onto blank image
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prev_image = current_image.resize((max(8,new_width), max(8,new_height)))
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blank_image = Image.new("RGBA", (width, height), (0, 0, 0, 1))
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if (1 == opacity ):
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blank_image.paste(prev_image, (mask_width, mask_height))
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else:
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blank_image.putalpha(round(255*opacity))
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blank_image.paste(prev_image, (mask_width, mask_height))
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return blank_image
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