Question

我正在使用numpy在python中创建所有图像转换的简单图像编辑器。我遇到了亮度更改的问题-当我将亮度更改为-255或255时，我（显然）丢失了所有信息，并且将亮度更改回0并没有给我原始图像。我了解这种行为，但是如果我想获取原始图像怎么办？

我的解决方案是使用默认亮度保留图像的副本，但是这有点无效，因为现在我要更改两个图像-image_data和image_data_no_brightness进行除亮度更改（旋转（旋转）之外的其他所有变换），镜像，否定等）。

有没有更有效的解决方案？

import numpy as np
from matplotlib.pyplot import imshow, imsave, imread
from PIL import Image

MIRROR_VERTICAL = 0
MIRROR_HORIZONTAL = 1


class ImageEditor:

def __init__(self):
    self.image_data = None
    self.image_data_og = None
    self.image_data_no_brightness = None

def load_data(self, image_path):
    # todo fix imread and imwrite to be compatible with png images
    self.image_data = np.asarray(Image.open(image_path).convert('RGB'))
    self.image_data.setflags(write=True)
    self.image_data_og = self.image_data.copy()
    self.image_data_no_brightness = self.image_data.copy()

def get_data(self):
    return self.image_data

def save_image(self, image_path):
    imsave(image_path, self.image_data)

def show(self):
    imshow(self.image_data, cmap='gray')

def reset(self):
    self.image_data = self.image_data_og.copy()
    self.image_data_no_brightness = self.image_data_og.copy()

def rotate(self, angle):
    assert angle % 90 == 0  # GUI shouldn't let this happen
    self.image_data = np.rot90(self.image_data, k=angle / 90)
    self.image_data_no_brightness = np.rot90(self.image_data_no_brightness, k=angle / 90)

def mirror(self, axis=MIRROR_HORIZONTAL):
    self.image_data = np.flip(self.image_data, axis=axis)
    self.image_data_no_brightness = np.flip(self.image_data_no_brightness, axis=axis)

def negative(self):
    self.image_data = 255 - self.image_data
    self.image_data_no_brightness = 255 - self.image_data_no_brightness

def brightness(self, change):
    # convert to int16 as uint8 values could overflow
    self.image_data = np.clip(np.int16(self.image_data_no_brightness) + change, 0, 255)
    # convert back to uint8
    self.image_data = np.uint8(self.image_data)

改变图像亮度而不丢失信息的有效方法

0 个答案: