src/front_card_frame.py

from PIL import Image, ImageDraw
from io import BytesIO

# Pixel position information for each area of the card image

# Card
CARD_SIZE = (868, 1213)

# Picture
PICTURE_WHITE_LT_XY = (65, 188)
PICTURE_WHITE_RB_XY = (802, 925)

# Title
TITLE_BLEND_WHITE_LT_XY = (34, 29) 
TITLE_BLEND_WHITE_RB_XY = (833, 149)

# Main Body of Description
DESCRIPTION_BLEND_WHITELT_XY = (34, 961)
DESCRIPTION_BLEND_WHITERB_XY = (833, 1185)

def average_with_white(img, area):

    # Change alpha value
    x1, y1, x2, y2 = area
    for x in range(x1, x2):
        for y in range(y1, y2):
            r, g, b = img.getpixel((x, y))
            img.putpixel((x, y), ((r + 255) // 2, (g + 255) // 2, (b + 255) // 2))

    return img

def create_card_frame(img_bytearray):
    card_img = Image.open(img_bytearray).convert('RGB')
    card_img = card_img.resize(CARD_SIZE)
    card_imgdraw = ImageDraw.Draw(card_img)

    # Paint White to the Picture Area
    card_img.paste((255, 255, 255), PICTURE_WHITE_LT_XY + PICTURE_WHITE_RB_XY)
    
    # Make translucent to the Title Area
    card_img = average_with_white(card_img, TITLE_BLEND_WHITE_LT_XY + TITLE_BLEND_WHITE_RB_XY)
    # Draw black rectangle frame to the Title Area
    card_imgdraw.rectangle(TITLE_BLEND_WHITE_LT_XY + TITLE_BLEND_WHITE_RB_XY, outline=(0, 0, 0), width=5)
    
    # Make translucent to the Description Area
    card_img = average_with_white(card_img, DESCRIPTION_BLEND_WHITELT_XY + DESCRIPTION_BLEND_WHITERB_XY)
    # Draw rectangle frame to the Description Area
    card_imgdraw.rectangle(DESCRIPTION_BLEND_WHITELT_XY + DESCRIPTION_BLEND_WHITERB_XY, outline=(0, 0, 0), width=5)
    
    # Outputting Binary Data
    output_img_bytearray = BytesIO()
    card_img.save(output_img_bytearray, "PNG", quality=95)
    output_img_bytearray.seek(0) # Seek to the beginning of the image, otherwise it results in empty data

    return output_img_bytearray

if __name__ == '__main__':
    with open('data/cards/back/cats.png', 'rb') as f:
        card_frame_bytearray = BytesIO(f.read())
    
    card_frame_bytearray = create_card_frame(card_frame_bytearray)
    
    with open('test.jpeg', 'wb') as f:
        f.write(card_frame_bytearray.read())