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plurals

PO
primarykey
Id
20471251
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
4
CommunityOwnedDate
CreationDate
2013-12-09T12:57:28.457
FavoriteCount
0
LastActivityDate
2013-12-09T21:14:02.383
LastEditDate
2017-05-23T12:17:44.467
LastEditorUserId
-1
OwnerUserId
588071
ParentId
20368413
PostTypeId
2
Score
17
ViewCount
0
LastEditorDisplayName
text
Body
You will need the python imaging library (PIL) installed. (See here <a href="https://pypi.python.org/pypi/PIL" rel="nofollow noreferrer">https://pypi.python.org/pypi/PIL</a>). See these answers for examples of ways to install PIL: <a href="https://stackoverflow.com/questions/9070074/how-to-install-pil-on-mac-os-x-10-7-2-lion">answer 1</a>, <a href="https://stackoverflow.com/questions/8863917/importerror-no-module-named-pil">answer 2</a> Right, with that installed, the following code should do what you ask for: <pre><code>import matplotlib.pyplot as plt import matplotlib.ticker as plticker try: from PIL import Image except ImportError: import Image # Open image file image = Image.open('myImage.tiff') my_dpi=300. # Set up figure fig=plt.figure(figsize=(float(image.size[0])/my_dpi,float(image.size[1])/my_dpi),dpi=my_dpi) ax=fig.add_subplot(111) # Remove whitespace from around the image fig.subplots_adjust(left=0,right=1,bottom=0,top=1) # Set the gridding interval: here we use the major tick interval myInterval=100. loc = plticker.MultipleLocator(base=myInterval) ax.xaxis.set_major_locator(loc) ax.yaxis.set_major_locator(loc) # Add the grid ax.grid(which='major', axis='both', linestyle='-') # Add the image ax.imshow(image) # Find number of gridsquares in x and y direction nx=abs(int(float(ax.get_xlim()[1]-ax.get_xlim()[0])/float(myInterval))) ny=abs(int(float(ax.get_ylim()[1]-ax.get_ylim()[0])/float(myInterval))) # Add some labels to the gridsquares for j in range(ny): y=myInterval/2+j*myInterval for i in range(nx): x=myInterval/2.+float(i)*myInterval ax.text(x,y,'{:d}'.format(i+j*nx),color='w',ha='center',va='center') # Save the figure fig.savefig('myImageGrid.tiff',dpi=my_dpi) </code></pre> Which, if used on the <code>grace_hopper.png</code> example file, produces the following output: <img src="https://i.stack.imgur.com/9jY9C.png" alt="Image with numbered grid">
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