134 lines
3.4 KiB
Python
134 lines
3.4 KiB
Python
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import colorsys
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from dataclasses import dataclass
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from typing import Self
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import numpy as np
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from PIL import Image, ImageDraw, ImageFont
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@dataclass(slots=True, frozen=True)
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class AdventImage:
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img: Image.Image
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@classmethod
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async def from_img(cls, img: Image.Image) -> Self:
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"""
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Einen quadratischen Ausschnitt aus der Mitte des Bilds nehmen
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"""
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# Farbmodell festlegen
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img = img.convert(mode="RGB")
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# Größen bestimmen
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width, height = img.size
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square = min(width, height)
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# zuschneiden
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img = img.crop(
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box=(
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int((width - square) / 2),
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int((height - square) / 2),
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int((width + square) / 2),
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int((height + square) / 2),
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)
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)
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# skalieren
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return cls(
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img.resize(
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size=(500, 500),
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resample=Image.LANCZOS,
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)
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)
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async def get_text_box(
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self,
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xy: tuple[float, float],
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text: str | bytes,
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font: "ImageFont._Font",
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anchor: str | None = "mm",
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**text_kwargs,
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) -> Image._Box | None:
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"""
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Koordinaten (links, oben, rechts, unten) des betroffenen
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Rechtecks bestimmen, wenn das Bild mit einem Text
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versehen wird
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"""
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# Neues 1-Bit Bild, gleiche Größe
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mask = Image.new(mode="1", size=self.img.size, color=0)
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# Text auf Maske auftragen
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ImageDraw.Draw(mask).text(
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xy=xy,
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text=text,
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font=font,
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anchor=anchor,
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fill=1,
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**text_kwargs,
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)
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# betroffenen Pixelbereich bestimmen
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return mask.getbbox()
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async def get_average_color(
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self,
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box: Image._Box,
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) -> tuple[int, int, int]:
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"""
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Durchschnittsfarbe eines rechteckigen Ausschnitts in
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einem Bild berechnen
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"""
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pixel_data = self.img.crop(box).getdata()
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mean_color: np.ndarray = np.mean(a=pixel_data, axis=0)
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return tuple(mean_color.astype(int)[:3])
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async def hide_text(
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self,
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xy: tuple[float, float],
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text: str | bytes,
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font: "ImageFont._Font",
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anchor: str | None = "mm",
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**text_kwargs,
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) -> None:
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"""
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Text `text` in Bild an Position `xy` verstecken.
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Weitere Parameter wie bei `ImageDraw.text()`.
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"""
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# betroffenen Bildbereich bestimmen
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text_box = await self.get_text_box(
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xy=xy, text=text, font=font, anchor=anchor, **text_kwargs
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)
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if text_box is not None:
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# Durchschnittsfarbe bestimmen
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text_color = await self.get_average_color(
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box=text_box,
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)
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# etwas heller/dunkler machen
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tc_h, tc_s, tc_v = colorsys.rgb_to_hsv(*text_color)
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tc_v = int((tc_v - 127) * 0.97) + 127
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if tc_v < 127:
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tc_v += 3
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else:
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tc_v -= 3
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text_color = colorsys.hsv_to_rgb(tc_h, tc_s, tc_v)
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text_color = tuple(int(val) for val in text_color)
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# Buchstaben verstecken
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ImageDraw.Draw(self.img).text(
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xy=xy,
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text=text,
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font=font,
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fill=text_color,
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anchor=anchor,
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**text_kwargs,
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)
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