blocks|key|1740503|text|最好使用Python+Image+Library来做这件事，我担心这是一个单独的下载。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1740504|做你想做的事情最简单的方法是通过load()+method+on+the+Image+object，它返回一个像素访问对象，你可以像操作数组一样操作它：|1740505|from+PIL+import+Image

im+=+Image.open('dead_parrot.jpg')+#+Can+be+many+different+formats.
pix+=+im.load()
print+im.size++#+Get+the+width+and+hight+of+the+image+for+iterating+over
print+pix[x,y]++#+Get+the+RGBA+Value+of+the+a+pixel+of+an+image
pix[x,y]+=+value++#+Set+the+RGBA+Value+of+the+image+(tuple)
im.save('alive_parrot.png')++#+Save+the+modified+pixels+as+.png|code-block|syntax|javascript|1740506|或者，看看ImageDraw，它提供了更丰富的应用程序接口来创建图像。|1740507|entityMap|0|LINK|mutability|MUTABLE|url|http://www.pythonware.com/products/pil/|1|http://effbot.org/imagingbook/image.htm|2|http://effbot.org/imagingbook/imagedraw.htm^0|4|K|0|0|G|X|1|0|0|5|9|2|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@$A|Z|B|10|1|11]]|C|$]]|$1|D|3|E|5|6|7|12|8|@]|9|@$A|13|B|14|1|15]]|C|$]]|$1|F|3|G|5|H|7|16|8|@]|9|@]|C|$I|J]]|$1|K|3|L|5|6|7|17|8|@]|9|@$A|18|B|19|1|1A]]|C|$]]|$1|M|3|-4|5|6|7|1B|8|@]|9|@]|C|$]]]|N|$O|$5|P|Q|R|C|$S|T]]|U|$5|P|Q|R|C|$S|V]]|W|$5|P|Q|R|C|$S|X]]]]

It's probably best to use the <a href="http://www.pythonware.com/products/pil/" rel="noreferrer">Python Image Library</a> to do this which I'm afraid is a separate download.

The easiest way to do what you want is via the <a href="http://effbot.org/imagingbook/image.htm" rel="noreferrer">load() method on the Image object</a> which returns a pixel access object which you can manipulate like an array:

<pre><code>from PIL import Image

im = Image.open('dead_parrot.jpg') # Can be many different formats.
pix = im.load()
print im.size # Get the width and hight of the image for iterating over
print pix[x,y] # Get the RGBA Value of the a pixel of an image
pix[x,y] = value # Set the RGBA Value of the image (tuple)
im.save('alive_parrot.png') # Save the modified pixels as .png
</code></pre>

Alternatively, look at <a href="http://effbot.org/imagingbook/imagedraw.htm" rel="noreferrer">ImageDraw</a> which gives a much richer API for creating images.

blocks|key|1740650|text|在wiki.wxpython.org上有一篇非常好的文章，题目是Working+With+Images。文章提到了使用wxWidgets+(wxImage)、PIL或PythonMagick的可能性。就我个人而言，我使用过PIL和wxWidgets，它们都使得图像操作变得相当简单。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1740651|entityMap|0|LINK|mutability|MUTABLE|url|http://wiki.wxpython.org/index.cgi/WorkingWithImages^0|W|J|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

There's a really good article on wiki.wxpython.org entitled <a href="http://wiki.wxpython.org/index.cgi/WorkingWithImages" rel="nofollow noreferrer">Working With Images</a>. The article mentions the possiblity of using wxWidgets (wxImage), PIL or PythonMagick. Personally, I've used PIL and wxWidgets and both make image manipulation fairly easy.

blocks|key|1740740|text|你可以使用pygame的surfarray模块。这个模块有一个叫做pixels3d(表面)的3d像素数组返回方法。我已经展示了下面的用法：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1740741|from+pygame+import+surfarray,+image,+display
import+pygame
import+numpy+#important+to+import

pygame.init()
image+=+image.load("myimagefile.jpg")+#surface+to+render
resolution+=+(image.get_width(),image.get_height())
screen+=+display.set_mode(resolution)+#create+space+for+display
screen.blit(image,+(0,0))+#superpose+image+on+screen
display.flip()
surfarray.use_arraytype("numpy")+#important!
screenpix+=+surfarray.pixels3d(image)+#pixels+in+3d+array:
#[x][y][rgb]
for+y+in+range(resolution[1]):
++++for+x+in+range(resolution[0]):
++++++++for+color+in+range(3):
++++++++++++screenpix[x][y][color]+%2B=+128
++++++++++++#reverting+colors
screen.blit(surfarray.make_surface(screenpix),+(0,0))+#superpose+on+screen
display.flip()+#update+display
while+1:
++++print+finished|code-block|syntax|javascript|1740742|我希望能对你有所帮助。最后一句话:+screen在screenpix的生命周期内被锁定。|1740743|entityMap|0|LINK|mutability|MUTABLE|url|http://www.pygame.org/^0|5|6|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@$A|T|B|U|1|V]]|C|$]]|$1|D|3|E|5|F|7|W|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|X|8|@]|9|@]|C|$]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|C|$]]]|L|$M|$5|N|O|P|C|$Q|R]]]]

You can use <a href="http://www.pygame.org" rel="nofollow noreferrer">pygame</a>'s surfarray module. This module has a 3d pixel array returning method called pixels3d(surface). I've shown usage below:

<pre><code>from pygame import surfarray, image, display
import pygame
import numpy #important to import

pygame.init()
image = image.load("myimagefile.jpg") #surface to render
resolution = (image.get_width(),image.get_height())
screen = display.set_mode(resolution) #create space for display
screen.blit(image, (0,0)) #superpose image on screen
display.flip()
surfarray.use_arraytype("numpy") #important!
screenpix = surfarray.pixels3d(image) #pixels in 3d array:
#[x][y][rgb]
for y in range(resolution[1]):
 for x in range(resolution[0]):
 for color in range(3):
 screenpix[x][y][color] += 128
 #reverting colors
screen.blit(surfarray.make_surface(screenpix), (0,0)) #superpose on screen
display.flip() #update display
while 1:
 print finished
</code></pre>

I hope been helpful. Last word: screen is locked for lifetime of screenpix.

blocks|key|1525781|text|使用命令"sudo+apt-get+install+python-imaging“安装PIL并运行以下程序。它将打印图像的RGB值。如果图像很大，请使用'>‘将输出重定向到文件，然后打开该文件查看RGB值|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1525782|import+PIL
import+Image
FILENAME='fn.gif'+#image+can+be+in+gif+jpeg+or+png+format+
im=Image.open(FILENAME).convert('RGB')
pix=im.load()
w=im.size[0]
h=im.size[1]
for+i+in+range(w):
++for+j+in+range(h):
++++print+pix[i,j]|code-block|syntax|javascript|1525783|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

install PIL using the command "sudo apt-get install python-imaging" and run the following program. It will print RGB values of the image. If the image is large redirect the output to a file using '>' later open the file to see RGB values

<pre><code>import PIL
import Image
FILENAME='fn.gif' #image can be in gif jpeg or png format 
im=Image.open(FILENAME).convert('RGB')
pix=im.load()
w=im.size[0]
h=im.size[1]
for i in range(w):
 for j in range(h):
 print pix[i,j]
</code></pre>

blocks|key|1525880|text|您可以使用Tkinter模块，它是Tk工具包的标准Python接口，不需要额外下载。参见https://docs.python.org/2/library/tkinter.html。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1525881|(对于Python+3，Tkinter重命名为tkinter)|1525882|以下是如何设置RGB值：|1525883|#from+http://tkinter.unpythonic.net/wiki/PhotoImage
from+Tkinter+import+*

root+=+Tk()

def+pixel(image,+pos,+color):
++++"""Place+pixel+at+pos=(x,y)+on+image,+with+color=(r,g,b)."""
++++r,g,b+=+color
++++x,y+=+pos
++++image.put("#%2502x%2502x%2502x"+%25+(r,g,b),+(y,+x))

photo+=+PhotoImage(width=32,+height=32)

pixel(photo,+(16,16),+(255,0,0))++#+One+lone+pixel+in+the+middle...

label+=+Label(root,+image=photo)
label.grid()
root.mainloop()|code-block|syntax|javascript|1525884|并获取RGB：|1525885|#from+http://www.kosbie.net/cmu/spring-14/15-112/handouts/steganographyEncoder.py
def+getRGB(image,+x,+y):
++++value+=+image.get(x,+y)
++++return+tuple(map(int,+value.split("+")))|1525886|entityMap|0|LINK|mutability|MUTABLE|url|https://docs.python.org/2/library/tkinter.html^0|18|1A|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@$A|Z|B|10|1|11]]|C|$]]|$1|D|3|E|5|6|7|12|8|@]|9|@]|C|$]]|$1|F|3|G|5|6|7|13|8|@]|9|@]|C|$]]|$1|H|3|I|5|J|7|14|8|@]|9|@]|C|$K|L]]|$1|M|3|N|5|6|7|15|8|@]|9|@]|C|$]]|$1|O|3|P|5|J|7|16|8|@]|9|@]|C|$K|L]]|$1|Q|3|-4|5|6|7|17|8|@]|9|@]|C|$]]]|R|$S|$5|T|U|V|C|$W|X]]]]

You could use the Tkinter module, which is the standard Python interface to the Tk GUI toolkit and you don't need extra download. See <a href="https://docs.python.org/2/library/tkinter.html" rel="nofollow">https://docs.python.org/2/library/tkinter.html</a>.

(For Python 3, Tkinter is renamed to tkinter)

Here is how to set RGB values:

<pre><code>#from http://tkinter.unpythonic.net/wiki/PhotoImage
from Tkinter import *

root = Tk()

def pixel(image, pos, color):
 """Place pixel at pos=(x,y) on image, with color=(r,g,b)."""
 r,g,b = color
 x,y = pos
 image.put("#%02x%02x%02x" % (r,g,b), (y, x))

photo = PhotoImage(width=32, height=32)

pixel(photo, (16,16), (255,0,0)) # One lone pixel in the middle...

label = Label(root, image=photo)
label.grid()
root.mainloop()
</code></pre>

And get RGB:

<pre><code>#from http://www.kosbie.net/cmu/spring-14/15-112/handouts/steganographyEncoder.py
def getRGB(image, x, y):
 value = image.get(x, y)
 return tuple(map(int, value.split(" ")))
</code></pre>

blocks|key|1525906|text|photo+=+Image.open('IN.jpg')+#your+image
photo+=+photo.convert('RGB')

width+=+photo.size[0]+#define+W+and+H
height+=+photo.size[1]

for+y+in+range(0,+height):+#each+pixel+has+coordinates
++++row+=+""
++++for+x+in+range(0,+width):

++++++++RGB+=+photo.getpixel((x,y))
++++++++R,G,B+=+RGB++#now+you+can+use+the+RGB+value|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1525907|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>photo = Image.open('IN.jpg') #your image
photo = photo.convert('RGB')

width = photo.size[0] #define W and H
height = photo.size[1]

for y in range(0, height): #each pixel has coordinates
 row = ""
 for x in range(0, width):

 RGB = photo.getpixel((x,y))
 R,G,B = RGB #now you can use the RGB value
</code></pre>

blocks|key|1740984|text|import+matplotlib.pyplot+as+plt
import+matplotlib.image+as+mpimg

img=mpimg.imread('Cricket_ACT_official_logo.png')
imgplot+=+plt.imshow(img)|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1740985|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>import matplotlib.pyplot as plt
import matplotlib.image as mpimg

img=mpimg.imread('Cricket_ACT_official_logo.png')
imgplot = plt.imshow(img)
</code></pre>

blocks|key|1525995|text|如果您希望以RGB颜色代码的形式获得三位数，则以下代码应该可以做到这一点。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1525996|i+=+Image.open(path)
pixels+=+i.load()+#+this+is+not+a+list,+nor+is+it+list()'able
width,+height+=+i.size

all_pixels+=+[]
for+x+in+range(width):
++++for+y+in+range(height):
++++++++cpixel+=+pixels[x,+y]
++++++++all_pixels.append(cpixel)|code-block|syntax|javascript|1525997|这可能对你有用。|1525998|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

If you are looking to have three digits in the form of an RGB colour code, the following code should do just that.

<pre><code>i = Image.open(path)
pixels = i.load() # this is not a list, nor is it list()'able
width, height = i.size

all_pixels = []
for x in range(width):
 for y in range(height):
 cpixel = pixels[x, y]
 all_pixels.append(cpixel)
</code></pre>

This may work for you.

If I open an image with <code>open("image.jpg")</code>, how can I get the RGB values of a pixel assuming I have the coordinates of the pixel?

Then, how can I do the reverse of this? Starting with a blank graphic, 'write' a pixel with a certain RGB value?

I would prefer if I didn't have to download any additional libraries.

How to read the RGB value of a given pixel in Python?

如果我用open("image.jpg")打开一个图像，假设我知道像素的坐标，我如何获得该像素的RGB值？那么，我该如何反其道而行之呢？从一个空白图形开始，“写”一个具有某个RGB值的像素？如果我不需要下载任何额外的库，我会更喜欢。

问如何在Python中读取给定像素的RGB值？
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