Python 如何根据背景图像规范添加水印对角限制高度和宽度而不损失logo质量

Question summary:我的预期结果是，无论背景图像的宽度和高度如何，水印都能以对角线为框架，始终符合限制条件，并且尺寸能保持徽标的质量.

为了不丢失我用作水印的图像的质量，我不得不从我要粘贴它的图像的宽度重新调整它的大小，但正如你在我将在代码下面发布的图像中所看到的，当图像的高度太小时，水印超出了图像的限制.

如果我需要根据另一幅图像的宽度来调整水印以保持质量，我应该如何调整高度和宽度，以便水印完全适合另一幅图像，而不管其高度或宽度如何？

from PIL import Image

def watermark_with_transparency(input_image_path,
                                output_image_path,
                                watermark_image_path):
    
    TRANSPARENCY = 20
    angle = 30

    base_image = Image.open(input_image_path)
    w_img, h_img = base_image.size
    
    basewidth = w_img
    watermark = Image.open(watermark_image_path)
    wpercent = (basewidth/float(watermark.size[0]))
    hsize = int((float(watermark.size[1])*float(wpercent)))
    watermark = watermark.resize((basewidth,hsize), Image.ANTIALIAS)
    watermark = watermark.rotate( angle, expand=1 )
    w_logo, h_logo = watermark.size

    center_y = int(h_img / 2)
    center_x = int(w_img / 2)
    top_y = center_y - int(h_logo / 2)
    left_x = center_x - int(w_logo / 2)

    if watermark.mode!='RGBA':
        alpha = Image.new('L', (w_img, h_img), 255)
        watermark.putalpha(alpha)

    paste_mask = watermark.split()[3].point(lambda i: i * TRANSPARENCY / 100.)
    base_image.paste(watermark, (left_x,top_y), mask=paste_mask)
    base_image.show()
    base_image.save(output_image_path)

if __name__ == '__main__':
    watermark_with_transparency(
        'jogos_de_hoje_na_tv.png',
        'watermark_create.png',
        'logo_com_transparencia.png'
        )

Current result:

我试着添加这样的宽度:

    basehight = h_img
    hpercent = (basehight/float(watermark.size[0]))
    wsize = int((float(watermark.size[0])*float(hpercent)))

    watermark = watermark.resize((wsize,hsize), Image.ANTIALIAS)

但结果是一个高度很大的水印，在尺寸调整上没有任何质量.