如何调整代码，使透明的python图像在另一个图像上（使用新的着色颜色）呈现高质量？

Question

所以我有两张照片。一个png皮卡丘和一个黑色背景

用我目前的代码，我成功地合并了两个图像在一起，并着色透明皮卡丘，但正如你所看到的结果是不好的。我尝试了多张透明图片，结果都是一样的

以下是我的代码当前的外观：

def image_tint(src, tint='#ffffff'):
if Image.isStringType(src):  # file path?
    src = Image.open(src)
    src = src.convert('RGB') 
if src.mode not in ['RGB', 'RGBA']:
    raise TypeError('Unsupported source image mode: {}'.format(src.mode))
src.load()

tr, tg, tb = getrgb(tint)
tl = getcolor(tint, "L")  # tint color's overall luminosity
if not tl: tl = 1  # avoid division by zero
tl = float(tl)  # compute luminosity preserving tint factors
sr, sg, sb = map(lambda tv: tv/tl, (tr, tg, tb))  # per component
                                                  # adjustments
# create look-up tables to map luminosity to adjusted tint
# (using floating-point math only to compute table)
luts = (tuple(map(lambda lr: int(lr*sr + 0.5), range(256))) +
        tuple(map(lambda lg: int(lg*sg + 0.5), range(256))) +
        tuple(map(lambda lb: int(lb*sb + 0.5), range(256))))
l = grayscale(src)  # 8-bit luminosity version of whole image
if Image.getmodebands(src.mode) < 4:
    merge_args = (src.mode, (l, l, l))  # for RGB verion of grayscale
else:  # include copy of src image's alpha layer
    a = Image.new("L", src.size)
    a.putdata(src.getdata(3))
    merge_args = (src.mode, (l, l, l, a))  # for RGBA verion of grayscale
    luts += tuple(range(256))  # for 1:1 mapping of copied alpha values

return Image.merge(*merge_args).point(luts)

当我使用它时：

transparent_files = 'Images/transparentImageFolder' 
static_files = 'Images/staticImageFolder' 

for pathtransparent, dirs, filetransparent in os.walk(transparent_files):
    for pathstatic, dirs, filesstatic in os.walk(static_files): 
        for transparentfile in filetransparent:
            input_image_path = pathtransparent + "/" + transparentfile
            print('tinting "{}"'.format(input_image_path))
            result = image_tint(input_image_path, '#444222') 
            result.save(input_image_path)

            for staticfile in filesstatic:
                staticImage= Image.open(pathstatic + "/" + staticfile, 'r').convert("RGBA")

                transparentImage =  Image.open(pathtransparent + "/" + transparentfile, 'r').convert("RGBA")    
                text_img = Image.new('RGBA', (staticImage.width, staticImage.height), (0, 0, 0, 0))
                text_img.paste(staticImage, ((text_img.width - staticImage.width) // 2, (text_img.height - staticImage.height) // 2))
                text_img.paste(transparentImage, ((text_img.width - transparentImage.width) // 2, (text_img.height - transparentImage.height) 
                text_img.save(pathtransparent + "/" + transparentfile)

为什么质量这么差

Answer 1

你的第四行src = src.convert('RGB')是拿走src并扔掉alpha通道。尝试删除该行，或者改为执行src = src.convert('RGBA')，结果应该会有所改善