FilterQuality

Quality levels for image sampling in Image and DecorationImage objects.

Inherits: Enum

Properties

• HIGH –

  Best possible quality when scaling up images by scale factors larger than 5-10x.

• LOW –

  Better quality than none, faster than medium.

• MEDIUM –

  The best all around filtering method that is only worse than high at extremely large scale factors.

• NONE –

  The fastest filtering method, albeit also the lowest quality.

Examples

Showcase

import flet as ft

IMAGE_URL = "https://picsum.photos/id/1025/64/64"


def showcase_card(quality: ft.FilterQuality) -> ft.Container:
    return ft.Container(
        width=300,
        padding=12,
        border=ft.Border.all(1, ft.Colors.RED),
        border_radius=10,
        bgcolor=ft.Colors.SURFACE_CONTAINER_LOW,
        content=ft.Column(
            spacing=8,
            controls=[
                ft.Text(quality.name, weight=ft.FontWeight.BOLD),
                ft.Container(
                    width=240,
                    height=120,
                    border=ft.Border.all(1, ft.Colors.OUTLINE),
                    border_radius=8,
                    clip_behavior=ft.ClipBehavior.HARD_EDGE,
                    bgcolor=ft.Colors.SURFACE,
                    content=ft.Image(
                        src=IMAGE_URL,
                        width=240,
                        height=120,
                        fit=ft.BoxFit.FILL,
                        filter_quality=quality,
                    ),
                ),
            ],
        ),
    )


def main(page: ft.Page):
    page.horizontal_alignment = ft.CrossAxisAlignment.CENTER

    page.appbar = ft.AppBar(title="FilterQuality Showcase")
    page.add(
        ft.SafeArea(
            content=ft.Column(
                controls=[
                    ft.Text(
                        "Compare image sampling quality while scaling the "
                        "same source image."
                    ),
                    ft.Row(
                        wrap=True,
                        spacing=12,
                        expand=True,
                        scroll=ft.ScrollMode.AUTO,
                        alignment=ft.MainAxisAlignment.CENTER,
                        controls=[
                            showcase_card(quality) for quality in ft.FilterQuality
                        ],
                    ),
                ],
            ),
        )
    )


if __name__ == "__main__":
    ft.run(main)

Properties

HIGH = 'high' class-attribute instance-attribute

Best possible quality when scaling up images by scale factors larger than 5-10x. When images are scaled down, this can be worse than medium for scales smaller than 0.5x, or when animating the scale factor. This option is also the slowest.

LOW = 'low' class-attribute instance-attribute

Better quality than none, faster than medium.

MEDIUM = 'medium' class-attribute instance-attribute

The best all around filtering method that is only worse than high at extremely large scale factors.

NONE = 'none' class-attribute instance-attribute

The fastest filtering method, albeit also the lowest quality.