我看到了 QImage.bits()
函数和 QImage.constBits()
,但两者都返回 voidptr
并且我'我不确定在 python 中你能用它做什么。我熟悉 C++ 语法,但不熟悉 python。
至于数据类型,我的意思是:
黑白像素等于 [[0,0,0],[255,255,255]]
,其中 QImage
为 Format.RGB888
最佳答案
我希望我了解您的需求,这里我整理了一个应用程序。这会将 QImage 转换为四元组 RGBA 值列表,我希望它至少能帮助您弄清楚如何做到这一点,您可以根据您的需要实现不同的方法,您可以使用矩阵/矩阵操作库。喜欢NumPy或任何其他矩阵操作库。
但是,在这种情况下,我没有创建任何依赖项,因为我认为保持简单更好,如果您需要更复杂的东西,您可以深入研究...
您需要一张图像,为了简单起见,我将提供 3 张图像,每张图像都有不同的大小和像素颜色图像 1:
图2:
图3:
您还可以check my website to see the code
这是代码:
from PyQt4.QtCore import *
from PyQt4.QtGui import *
import sys
class main_window(QDialog):
def __init__(self):
QDialog.__init__(self)
# Create a QTextBrowser
qtb_rgba = QTextBrowser(self)
# Create an empty list
li_pixels = list()
#!! QImage to list of pixels !! >>> RGB format
image = QImage()
load_image = image.load("test_img_3x3", ".jpg")
# Make sure you got an image named "test_img_3x3" .jpg extension , it needs to sit on your HDD,
# in the root from where you run the script
# create it with the size of 3x3 , do it in Paint, or any other 2d image manipulation software
# An assert error will occur if fails to open your image
assert load_image == True
# Find more data about our image
# In our case is obvios that we create with our hand an image .jpg with a size of 3x3
# Even so, the functions bellow will may help us sometimes
# Obtain image size
image_width = image.width()
image_height = image.height()
print("Your image size is:\nWidth: " + str(image_width) + " Height: " + str(image_height) + "\n" + str(image_width) + "x" + str(image_height))
# Get QRGB values
qrgb = image.pixel(0, 0)
print("QRGB Values: " + str(qrgb))
# Convert it to QColor
qrgb_to_QCol = QColor(qrgb)
# Once you got it converted in QColor you got a lot of freedom to choose from,
# you can convert it to some of the most popular formats like:
# CMYK, HSL, RGB, RGBA, magenta, or even individual chanels R , G , B + a lot of other formats, even Floats...
# Convert it to RGBA
rgba = qrgb_to_QCol.getRgb()
print("RGBA Values: " + str(rgba))
# In order to achieve our goal: list of pixels for the entire image
# we got many ways to achieve it, depending of your needs you may implelent it different
# I will continue by producing a list of quadruplets values,
# from left to right - top to bottom
# The Quadruplets value for the list will be, which mean that 0 will hold value 0 on list , 1 hold 1 and so on...
# y _ _
#x|0 1 2
#|3 4 5
#|6 7 8
# And the position will be:
# y _ _
#x|0.0 1.0 2.0
#|0.1 1.1 2.1
#|0.2 1.2 2.2
# So let`s do it
# Generate a list of numbers for width
li_num_width = []
for i in range(image_width):
li_num_width.append(i)
# Generate a list of numbers for height
li_num_height = []
for i in range(image_height):
li_num_height.append(i)
# List for x num
x = [li_num_width for i in range(len(li_num_height))]
print("\nX list is:\n" + str(x))
# List for y num
for i in range(len(li_num_height)):
y = [[i]*len(li_num_width) for i in range(len(li_num_height))]
print("\nY list is:\n" + str(y))
row_el_li = []
row_el_li_y = []
# Obtain list numbers for x
for i in range(len(li_num_height)):
row = x[i]
for i in range(len(li_num_width)):
row_el = row[i]
#print(row_el)
row_el_li.append(row_el)
print("\nRow Elements list x: \n" + str(row_el_li))
# Obtain list numbers for y
for i in range(len(li_num_height)):
row_y = y[i]
for i in range(len(li_num_width)):
row_el_y = row_y[i]
#print(row_el_y)
row_el_li_y.append(row_el_y)
print("\nRow Elements list y: \n" + str(row_el_li_y))
# Create a list, which eventualy will hold qrgb values, which is our goal
qrgb_li = []
# How many values will the list hold? or How many pixels in the image do we have?
num_pixels = len(li_num_width) * len(li_num_height)
print("\nNumber of Pixels:" + str(num_pixels))
for i in range(num_pixels):
ordered_qrgb = image.pixel(row_el_li[i], row_el_li_y[i])
qrgb_li.append(ordered_qrgb)
# One more step lets convert from QRGB list to RGBA list, which will lead us to the end of this tutorial
rgba_li = []
for i in range(len(qrgb_li)):
qrgb_li_to_QCol = QColor(qrgb_li[i])
rgba_set = qrgb_li_to_QCol.getRgb()
rgba_li.append(rgba_set)
print("\nList of Quadruplets RGBA Value: \n" + str(rgba_li))
#!! QImage to list of pixels End !!
qtb_rgba.setText(str(rgba_li))
#.......
self.setFixedSize(250, 300)
self.setWindowTitle("QImage to list of pixels")
#.......3D Sasu Catalin
app = QApplication(sys.argv)
dialog = main_window()
dialog.show()
sys.exit(app.exec_())
我希望对您有所帮助,如果您需要有关此主题的更多详细信息,您可以访问 my website时不时...
关于python - 在 PyQt 中,如何将 QImage 转换为像素列表?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/32059309/