大约有 345 项符合查询结果（耗时：0.0134秒） [XML]
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')
...
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
...
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
...
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);
...
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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Normalize data in pandas
...eated as a 7 effectively) with a midpoint of 2, but shrink it to fit a 256 RGB colormap:
#In[1]
NormData([-5,2,10],low=-7,center=1,hi=7,shrinkfactor=2./256)
#Out[1]
[0.1279296875, 0.5826822916666667, 0.99609375]
It can also turn your data inside out... this may seem odd, but I found it useful for...