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How can I measure the similarity between two images? [closed]
...al number of sections (say a 10x10 grid) and then computing a histogram of RGB values inside of each cell and compare corresponding histograms. This type of algorithm is preferred because of both its simplicity and it's invariance to scaling and (small!) translation.
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Set transparent background using ImageMagick and commandline prompt
...tched to PNG it did exactly what I wanted - just had to change "white" to "rgb($r,$g,$b)".
– Roger Dueck
Feb 9 '16 at 22:41
3
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Add Text on Image using PIL
...hapes and text.
from PIL import Image, ImageDraw
blank_image = Image.new('RGBA', (400, 300), 'white')
img_draw = ImageDraw.Draw(blank_image)
img_draw.rectangle((70, 50, 270, 200), outline='red', fill='blue')
img_draw.text((70, 250), 'Hello World', fill='green')
blank_image.save('drawn_image.jpg')
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pdftk compression option
... ./base/gsicc_manage.c:1050: gsicc_open_search(): Could not find default_rgb.ic
| ./base/gsicc_manage.c:1651: gsicc_set_device_profile(): cannot find device profile
74.8MB-->32.2MB
badly pixellated
bookmarks TOC are gone
qpdf --linearize:
very fast, a few seconds
no size change
bookmark...
Achieving bright, vivid colors for an iOS 7 translucent UINavigationBar
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Instead of creating your UIColor object in the RGB format, use HSB and increase the saturation parameter. (Credits to Sam Soffes who describes this method here)
navigationBar.barTintColor = [UIColor colorWithHue:0.555f saturation:1.f brightness:0.855f alpha:1.f];
Note:...
I do not want to inherit the child opacity from the parent in CSS
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Instead of using opacity, set a background-color with rgba, where 'a' is the level of transparency.
So instead of:
background-color: rgb(0,0,255); opacity: 0.5;
use
background-color: rgba(0,0,255,0.5);
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Convert PDF to image with high resolution
...1.702 Bytes (1.85 MByte).
Its resolution is 3060x3960 pixels, using 16-bit RGB color space.
The better, sharp image on the left has a file size of 337.879 Bytes (330 kByte).
Its resolution is 758x996 pixels, using 8-bit Gray color space.
So, no need to resize; add the -density flag. The density va...
Scatterplot with too many points
... y, col="#00000033"))
The first six numbers after the # are the color in RGB hex and the last two are the opacity, again in hex, so 33 ~ 3/16th opaque.
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C-like structures in Python
...hings where you would use a struct in C (something like x,y coordinates or RGB colors for example).
For everything else you can use dictionary, or a utility class like this one:
>>> class Bunch:
... def __init__(self, **kwds):
... self.__dict__.update(kwds)
...
>>> my...
How to check if a file is a valid image file?
... not recognized image file type. List of currently recognized image types: rgb, gif, pbm, pgm, ppm, tiff, rast, xbm, jpeg, bmp, png, webp, exr.
– patryk.beza
Apr 6 '16 at 15:29
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