Python Kivy拍摄背景清晰的屏幕截图

我正在开发一个Kivy应用程序，它可以让用户在模板上定位图像和文本标签。完成后，生成的图像将被裁剪以适合模板

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我需要在图像中的所有空白是清晰的，因为我将打印图像，不想浪费墨水。然而，Kivy用黑色填充了所有的空白。Kivy的export_to_png（）函数有没有办法使用透明背景而不是黑色背景？

我可能错了，但看起来透明颜色是硬编码的

看一下屏幕，似乎

ClearColor

硬编码为黑色

def export_to_png(self, filename, *args):
        '''Saves an image of the widget and its children in png format at the
        specified filename. Works by removing the widget canvas from its
        parent, rendering to an :class:`~kivy.graphics.fbo.Fbo`, and calling
        :meth:`~kivy.graphics.texture.Texture.save`.

        .. note::

            The image includes only this widget and its children. If you want
            to include widgets elsewhere in the tree, you must call
            :meth:`~Widget.export_to_png` from their common parent, or use
            :meth:`~kivy.core.window.WindowBase.screenshot` to capture the whole
            window.

        .. note::

            The image will be saved in png format, you should include the
            extension in your filename.

        .. versionadded:: 1.9.0
        '''

        if self.parent is not None:
            canvas_parent_index = self.parent.canvas.indexof(self.canvas)
            self.parent.canvas.remove(self.canvas)

        fbo = Fbo(size=self.size, with_stencilbuffer=True)

        with fbo:
            ClearColor(0, 0, 0, 1)
            ClearBuffers()
            Scale(1, -1, 1)
            Translate(-self.x, -self.y - self.height, 0)

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我想您可以尝试更新小部件模块代码，以接受一个参数来设置

ClearColor

我修改了函数，将Window.ClearColor用于ClearColor。这将在嵌入式应用程序中使用，所以我不太担心跨平台兼容性。是的，很有魅力。将透明颜色alpha设置为0，黑色背景消失！