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python-cheatsheet
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Jure Šorn 5 years ago
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  1. 22
      README.md
  2. 25
      index.html

22
README.md
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@ -2562,14 +2562,15 @@ Image
from PIL import Image
```
### Examples
#### Creates a PNG image of a rainbow gradient:
```python
width = 100
height = 100
size = width * height
pixels = [255 * i/size for i in range(size)]
WIDTH = 100
HEIGHT = 100
SIZE = WIDTH * HEIGHT
pixels = [255 * i/SIZE for i in range(SIZE)]
img = Image.new('HSV', (width, height))
img = Image.new('HSV', (WIDTH, HEIGHT))
img.putdata([(int(a), 255, 255) for a in pixels])
img.convert(mode='RGB').save('test.png')
```
@ -2591,18 +2592,17 @@ img.convert(mode='RGB').save('test.png')
* **`'HSV'` - 3x8-bit pixels, Hue, Saturation, Value color space.**
### Animation
#### Creates a GIF of a bouncing ball:
```python
from PIL import Image, ImageDraw
import imageio
height, r = 126, 10
HEIGHT, R = 126, 10
frames = []
for velocity in range(1, 16):
y = sum(range(velocity))
frame = Image.new('L', (height, height))
for velocity in range(15):
y = sum(range(velocity+1))
frame = Image.new('L', (HEIGHT, HEIGHT))
draw = ImageDraw.Draw(frame)
draw.ellipse((height/2-r, y, height/2+r, y+2*r), fill='white')
draw.ellipse((HEIGHT/2-R, y, HEIGHT/2+R, y+2*R), fill='white')
frames.append(frame)
frames += reversed(frames[1:-1])
imageio.mimsave('test.gif', frames, duration=0.03)

25
index.html
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@ -2181,15 +2181,16 @@ right = [[<span class="hljs-number">0.1</span>, <span class="hljs-number">0.6</s
<span class="hljs-keyword">from</span> PIL <span class="hljs-keyword">import</span> Image
</code></pre></div>
<div><h4 id="createsapngimageofarainbowgradient">Creates a PNG image of a rainbow gradient:</h4><pre><code class="python language-python hljs">width = <span class="hljs-number">100</span>
height = <span class="hljs-number">100</span>
size = width * height
pixels = [<span class="hljs-number">255</span> * i/size <span class="hljs-keyword">for</span> i <span class="hljs-keyword">in</span> range(size)]
<div><h3 id="examples">Examples</h3><div><h4 id="createsapngimageofarainbowgradient">Creates a PNG image of a rainbow gradient:</h4><pre><code class="python language-python hljs">WIDTH = <span class="hljs-number">100</span>
HEIGHT = <span class="hljs-number">100</span>
SIZE = WIDTH * HEIGHT
pixels = [<span class="hljs-number">255</span> * i/SIZE <span class="hljs-keyword">for</span> i <span class="hljs-keyword">in</span> range(SIZE)]
img = Image.new(<span class="hljs-string">'HSV'</span>, (width, height))
img = Image.new(<span class="hljs-string">'HSV'</span>, (WIDTH, HEIGHT))
img.putdata([(int(a), <span class="hljs-number">255</span>, <span class="hljs-number">255</span>) <span class="hljs-keyword">for</span> a <span class="hljs-keyword">in</span> pixels])
img.convert(mode=<span class="hljs-string">'RGB'</span>).save(<span class="hljs-string">'test.png'</span>)
</code></pre></div>
</code></pre></div></div>
<div><h4 id="addsnoisetoapngimage">Adds noise to a PNG image:</h4><pre><code class="python language-python hljs"><span class="hljs-keyword">from</span> random <span class="hljs-keyword">import</span> randint
add_noise = <span class="hljs-keyword">lambda</span> value: max(<span class="hljs-number">0</span>, min(<span class="hljs-number">255</span>, value + randint(<span class="hljs-number">-20</span>, <span class="hljs-number">20</span>)))
@ -2206,13 +2207,13 @@ img.convert(mode=<span class="hljs-string">'RGB'</span>).save(<span class="hljs-
<li><strong><code class="python hljs"><span class="hljs-string">'HSV'</span></code> - 3x8-bit pixels, Hue, Saturation, Value color space.</strong></li>
</ul><div><h3 id="animation">Animation</h3><div><h4 id="createsagifofabouncingball">Creates a GIF of a bouncing ball:</h4><pre><code class="python language-python hljs"><span class="hljs-keyword">from</span> PIL <span class="hljs-keyword">import</span> Image, ImageDraw
<span class="hljs-keyword">import</span> imageio
height, r = <span class="hljs-number">126</span>, <span class="hljs-number">10</span>
HEIGHT, R = <span class="hljs-number">126</span>, <span class="hljs-number">10</span>
frames = []
<span class="hljs-keyword">for</span> velocity <span class="hljs-keyword">in</span> range(<span class="hljs-number">1</span>, <span class="hljs-number">16</span>):
y = sum(range(velocity))
frame = Image.new(<span class="hljs-string">'L'</span>, (height, height))
<span class="hljs-keyword">for</span> velocity <span class="hljs-keyword">in</span> range(<span class="hljs-number">15</span>):
y = sum(range(velocity+<span class="hljs-number">1</span>))
frame = Image.new(<span class="hljs-string">'L'</span>, (HEIGHT, HEIGHT))
draw = ImageDraw.Draw(frame)
draw.ellipse((height/<span class="hljs-number">2</span>-r, y, height/<span class="hljs-number">2</span>+r, y+<span class="hljs-number">2</span>*r), fill=<span class="hljs-string">'white'</span>)
draw.ellipse((HEIGHT/<span class="hljs-number">2</span>-R, y, HEIGHT/<span class="hljs-number">2</span>+R, y+<span class="hljs-number">2</span>*R), fill=<span class="hljs-string">'white'</span>)
frames.append(frame)
frames += reversed(frames[<span class="hljs-number">1</span>:<span class="hljs-number">-1</span>])
imageio.mimsave(<span class="hljs-string">'test.gif'</span>, frames, duration=<span class="hljs-number">0.03</span>)
@ -2240,7 +2241,7 @@ imageio.mimsave(<span class="hljs-string">'test.gif'</span>, frames, duration=<s
wf.writeframes(<span class="hljs-string">b''</span>.join(frames_short))
</code></pre></div>
<div><h3 id="examples">Examples</h3><div><h4 id="savesasinewavetoamonowavfile">Saves a sine wave to a mono WAV file:</h4><pre><code class="python language-python hljs"><span class="hljs-keyword">from</span> math <span class="hljs-keyword">import</span> pi, sin
<div><h3 id="examples-1">Examples</h3><div><h4 id="savesasinewavetoamonowavfile">Saves a sine wave to a mono WAV file:</h4><pre><code class="python language-python hljs"><span class="hljs-keyword">from</span> math <span class="hljs-keyword">import</span> pi, sin
frames_f = (sin(i * <span class="hljs-number">2</span> * pi * <span class="hljs-number">440</span> / <span class="hljs-number">44100</span>) <span class="hljs-keyword">for</span> i <span class="hljs-keyword">in</span> range(<span class="hljs-number">100000</span>))
frames_i = (int(a * <span class="hljs-number">30000</span>) <span class="hljs-keyword">for</span> a <span class="hljs-keyword">in</span> frames_f)
write_to_wav_file(<span class="hljs-string">'test.wav'</span>, frames_i)

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