StackOverflow2013

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plurals

PO
primarykey
Id
9204506
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
3
CommunityOwnedDate
CreationDate
2012-02-09T02:10:52.130
FavoriteCount
0
LastActivityDate
2016-02-09T01:28:10.907
LastEditDate
2016-02-09T01:28:10.907
LastEditorUserId
214686
OwnerUserId
214686
ParentId
9193603
PostTypeId
2
Score
21
ViewCount
0
LastEditorDisplayName
text
Body
Here's a code snippet that shows how to use <a href="http://scikit-image.org" rel="noreferrer">scikit-image</a> to overlay colors on a grey-level image. The idea is to convert both images to the HSV color space, and then to replace the hue and saturation values of the grey-level image with those of the color mask. <pre><code>from skimage import data, color, io, img_as_float import numpy as np import matplotlib.pyplot as plt alpha = 0.6 img = img_as_float(data.camera()) rows, cols = img.shape # Construct a colour image to superimpose color_mask = np.zeros((rows, cols, 3)) color_mask[30:140, 30:140] = [1, 0, 0] # Red block color_mask[170:270, 40:120] = [0, 1, 0] # Green block color_mask[200:350, 200:350] = [0, 0, 1] # Blue block # Construct RGB version of grey-level image img_color = np.dstack((img, img, img)) # Convert the input image and color mask to Hue Saturation Value (HSV) # colorspace img_hsv = color.rgb2hsv(img_color) color_mask_hsv = color.rgb2hsv(color_mask) # Replace the hue and saturation of the original image # with that of the color mask img_hsv[..., 0] = color_mask_hsv[..., 0] img_hsv[..., 1] = color_mask_hsv[..., 1] * alpha img_masked = color.hsv2rgb(img_hsv) # Display the output f, (ax0, ax1, ax2) = plt.subplots(1, 3, subplot_kw={'xticks': [], 'yticks': []}) ax0.imshow(img, cmap=plt.cm.gray) ax1.imshow(color_mask) ax2.imshow(img_masked) plt.show() </code></pre> Here's the output: <img src="https://i.stack.imgur.com/9d1Qd.png" alt="enter image description here">
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Title
singulars
PostAcceptedAnswerId
1. This table or related slice is empty.
PostParentId
1. POApplying a coloured overlay to an image in either PIL or Imagemagik
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 PTQuestion
PostTypePostTypeId
1. PTAnswer
UserLastEditorUserId
1. USStefan van der Walt
UserOwnerUserId
1. USStefan van der Walt
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1. This table or related slice is empty.
PostsAcceptedAnswerId
1. POApplying a coloured overlay to an image in either PIL or Imagemagik
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1. This table or related slice is empty.
VotesPostIdCreationDate
1. VO
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2. VO
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3. VO
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CommentsPostId
1. COThanks Stefan, that was very useful.
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 USCtrlspc

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