利用Python与Flet写一个图片无损放大软件

一、前言：

将上传的图片无损放大2倍、4倍、8倍

二、利用Flet写个前端页面：

 

 三、前端页面代码：

page.title = "图片无所放大"
    page.vertical_alignment = "center"
    page.window_width = 500  # window's width is 200 px
    page.window_height = 700  # window's height is 200 px
    page.window_resizable = False  # window is not resizable
    page.window_center()
    page.update()

    t = flet.Text(value="图片无损放大软件", color="red", size=27, width=300, height=50,
                  weight=flet.FontWeight.W_500, text_align="center")
    image = flet.Image(src="https://pic.imgdb.cn/item/65af57e8871b83018affa6db.jpg", width=270, height=270,
                       fit=flet.ImageFit.CONTAIN)

    def radiogroup_changed(e):
        t1.value = f"你选择的放大倍数是:  {e.control.value}"
        enlarge_number.value = 0
        if "2" in e.control.value:
            enlarge_number.value = 2
        elif "4" in e.control.value:
            enlarge_number.value = 4
        elif "8" in e.control.value:
            enlarge_number.value = 8
        page.update()

    def get_directory_result1(e: FilePickerResultEvent):
        directory_path1.value = e.files[0].path if e.files else "Cancelled!"
        image.src = directory_path1.value if directory_path1.value else " "
        # directory_path1.value = e.path if e.path else "Cancelled!"
        directory_path1.update()
        page.update()

    get_directory_dialog1 = FilePicker(on_result=get_directory_result1)

    # # Open directory dialog
    # def get_directory_result2(e: FilePickerResultEvent):
    #     directory_path2.value = e.path if e.path else "Cancelled!"
    #     directory_path2.update()
    #
    # get_directory_dialog2 = FilePicker(on_result=get_directory_result2)
    # directory_path2 = Text()

    # Open directory dialog
    def get_directory_result3(e: FilePickerResultEvent):
        directory_path3.value = e.path if e.path else "Cancelled!"
        directory_path3.update()

    get_directory_dialog3 = FilePicker(on_result=get_directory_result3)
    directory_path3 = Text()

    # hide all dialogs in overlay
    page.overlay.extend([get_directory_dialog1, get_directory_dialog3])

    def button_clicked(e):
        if directory_path1.value:
            save_path = os.path.dirname(directory_path1.value) + "\save." + directory_path1.value.split(".")[-1]
            b.disabled = True
            try:
                enlarge_image(directory_path1.value, enlarge_number, save_path)
                # get_img_txt_ret(directory_path1.value, joint_path, directory_path3.value, t1, page, True)
                t1.value = "图片无所放大已完成。。。。"
            except Exception as e:
                t1.value = f"有点问题：{e}"
                print(e)

        else:
            t1.value = "请选择上传与保存文件路径。。。"
        page.update()

    t1 = Text()
    directory_path1 = Text()
    directory_path3 = Text()
    enlarge_number = Text()
    b = flet.ElevatedButton(text="确认提交", on_click=button_clicked, width=100, height=30)

    page.add(
        Row([t], alignment="center"),
        Row(
            [
                FilledTonalButton(
                    "上传图片",
                    icon=icons.FOLDER_OPEN,
                    on_click=lambda _: get_directory_dialog1.pick_files(allow_multiple=True),
                    disabled=page.web,
                    width=180, height=40
                ),
                directory_path1,
            ],
            alignment="center"
        ),
        Row(
            [image],
            alignment="center"
        ),
        Row(
            [
                flet.ElevatedButton(text='放大倍数'),
                flet.RadioGroup(content=flet.Row([flet.Radio(value="2倍", label="2倍"),
                                                  flet.Radio(value="4倍", label="4倍"),
                                                  flet.Radio(value="8倍", label="8倍")]), on_change=radiogroup_changed)
            ],
            alignment="center"
        ),
        Row(
            [
                FilledTonalButton(
                    "选择保存图片路径",
                    icon=icons.FOLDER_OPEN,
                    on_click=lambda _: get_directory_dialog3.get_directory_path(),
                    disabled=page.web,
                    width=200, height=40
                ),
                directory_path3,
            ],
            alignment="center"
        ),
        Row([b], alignment="center"),
        Row([t1], alignment="center"),
    )

四、Python处理后端图片代码：

"""放大图片"""
    img = Image.open(image_path)

    # JPEG格式图片转换为RGB格式
    if "png" or "PNG" not in image_path:
        img = img.convert("RGB")

    # 获取图片尺寸
    image_h, image_w = img.height, img.width
    print(image_h, image_w)
    num = int(enlarge_number.value)

    # 进行无损放大
    new_size = (image_h * num, image_w * num)
    resized_img = img.resize(new_size, resample=Image.BICUBIC)

    # 保存图片
    resized_img.save(save_path)

五、利用auto-py-to-exe制作exe软件

具体教程参考：

python打包exe实用工具auto-py-to-exe的操作方法

六、页面示例：

七、下载地址：

蓝奏云：https://wwbs.lanpv.com/iTilS1m09wbg