python调整图片色相，对应ps的色相值

ps的色相值调整是相对原图的基础左右调整的，这里最后的效果是对应ps色相调整的效果，ps的ctrl+u弹出调节色相窗口

def change_color():
    image: PngImageFile = Image.open("img/entrance1.png")

    hue_offest = (180.0) / 360.0

    bg : PngImageFile = Image.new("RGBA", (image.size[0], image.size[1]))

    for i in range(image.size[0]):
        for j in range(image.size[1]):
            try:
                r, g, b, alpha = image.getpixel((i, j))

                h, s, v = colorsys.rgb_to_hsv(r, g, b)

                if hue_offest > 0.0:
                    h = h + hue_offest
                else:
                    h = h - hue_offest

                if h <= 0.0:
                    h = -h
                elif h > 1.0:
                    h = h - 1.0

                r, g, b = colorsys.hsv_to_rgb(h, s, v)

                # 防止精度损失
                r += 0.0000000001
                g += 0.0000000001
                b += 0.0000000001

                r = int(r)
                g = int(g)
                b = int(b)

                bg.putpixel((i, j), (r, g, b, alpha)) # 值必需要int类型，不然没效果
            except Exception as e:
                continue

    # bg.save("output/save.png")
    bg.show()
    pass