python在内存中拼接图片，并且进行改变图片尺寸，并且压缩图片大小

野性酷女 2022-02-24 11:28 379阅读 0赞

#写爬取的图片到redis
    r = response.body
    base64_data = base64.b64encode(r)  # 读取图片转换的二进制文件，并给赋值
    self.rds.set(img_name, base64_data)
    
    #取得redis中的图片二进制文件在内存中进行拼接
    total_width = 8 * 512
    total_height = 4 * 512
    new_image = Image.new('RGB', (total_width, total_height))
    x_offset = 0
    y_offset = 0
    count = 1
    listkeys.sort(key=lambda x: tuple(int(i) for i in re.findall('\d+', str(x))[-3:]))
    images = map(Image.open, [BytesIO(base64.b64decode(data)) for data in spider.rds.mget(listkeys)])          
       for subitem in images:
            new_image.paste(subitem, (x_offset, y_offset))
            x_offset += subitem.size[0]
            if count % 8 == 0:
                x_offset = 0
                y_offset += subitem.size[0]
                count = 1
            else:
                count += 1
        new_image.resize((3328, 1664), Image.ANTIALIAS)
        imgByteArr = BytesIO()
        new_image.save(imgByteArr, format='JPEG')  # quality
        # new_image.save(settings["PIC_PATH"] + "\\" + item[0] + '.jpg', quality=75)
        imgByteArr = imgByteArr.getvalue()
        
        #接下来处理方式有：
        #方式一：接下来可以将imgByteArr保存到sqlite里面(对应sqlite里面的字段哪位BLOB字段)
        item_point["resultbyte"] = sqlite3.Binary(imgByteArr)
        #方式二：
        with open('./fgq.jpg','wb')as f:
        	f.write(imgByteArr)
        ......