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python-cheatsheet
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Image, Audio, Pygame

pull/116/merge
Jure Šorn 1 week ago
parent
9d321c6719
commit
37ab035370
3 changed files with 7 additions and 7 deletions
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  1. 6
      README.md
  2. 6
      index.html
  3. 2
      parse.js

6
README.md
View File

@ -2799,7 +2799,7 @@ from PIL import Image
### Modes
* **`'L'` - Lightness (greyscale image). Each pixel is an int between 0 and 255.**
* **`'RGB'` - Red, green, blue (true color image). Each pixel is a tuple of three ints.**
* **`'RGBA'` - RGB with alpha. Low alpha (i.e. forth int) makes pixels more transparent.**
* **`'RGBA'` - RGB with alpha. Low alpha (i.e. forth int) makes pixel more transparent.**
* **`'HSV'` - Hue, saturation, value. Three ints representing color in HSV color space.**
@ -2874,7 +2874,7 @@ import wave
<int> = <Wave>.getnchannels() # Returns number of samples per frame.
<int> = <Wave>.getsampwidth() # Returns number of bytes per sample.
<tuple> = <Wave>.getparams() # Returns namedtuple of all parameters.
<bytes> = <Wave>.readframes(nframes) # Returns next n frames (-1 returns all).
<bytes> = <Wave>.readframes(nframes) # Returns all frames if -1 is passed.
```
```python
@ -2919,7 +2919,7 @@ def read_wav_file(filename):
def write_to_wav_file(filename, samples_f, p=None, nchannels=1, sampwidth=2, framerate=44100):
def get_bytes(a_float):
a_float = max(-1, min(1 - 2e-16, a_float))
a_float += p.sampwidth == 1
a_float += (p.sampwidth == 1)
a_float *= pow(2, (p.sampwidth * 8) - 1)
return int(a_float).to_bytes(p.sampwidth, 'little', signed=(p.sampwidth != 1))
if p is None:

6
index.html
View File

@ -2290,7 +2290,7 @@ right = np.array([[<span class="hljs-number">0.1</span>, <span class="hljs-numb
<div><h3 id="modes-1">Modes</h3><ul>
<li><strong><code class="python hljs"><span class="hljs-string">'L'</span></code> - Lightness (greyscale image). Each pixel is an int between 0 and 255.</strong></li>
<li><strong><code class="python hljs"><span class="hljs-string">'RGB'</span></code> - Red, green, blue (true color image). Each pixel is a tuple of three ints.</strong></li>
<li><strong><code class="python hljs"><span class="hljs-string">'RGBA'</span></code> - RGB with alpha. Low alpha (i.e. forth int) makes pixels more transparent.</strong></li>
<li><strong><code class="python hljs"><span class="hljs-string">'RGBA'</span></code> - RGB with alpha. Low alpha (i.e. forth int) makes pixel more transparent.</strong></li>
<li><strong><code class="python hljs"><span class="hljs-string">'HSV'</span></code> - Hue, saturation, value. Three ints representing color in HSV color space.</strong></li>
</ul><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, HEIGHT = <span class="hljs-number">100</span>, <span class="hljs-number">100</span>
n_pixels = WIDTH * HEIGHT
@ -2352,7 +2352,7 @@ imageio.mimsave(<span class="hljs-string">'test.gif'</span>, frames, duration=<s
&lt;int&gt; = &lt;Wave&gt;.getnchannels() <span class="hljs-comment"># Returns number of samples per frame.</span>
&lt;int&gt; = &lt;Wave&gt;.getsampwidth() <span class="hljs-comment"># Returns number of bytes per sample.</span>
&lt;tuple&gt; = &lt;Wave&gt;.getparams() <span class="hljs-comment"># Returns namedtuple of all parameters.</span>
&lt;bytes&gt; = &lt;Wave&gt;.readframes(nframes) <span class="hljs-comment"># Returns next n frames (-1 returns all).</span>
&lt;bytes&gt; = &lt;Wave&gt;.readframes(nframes) <span class="hljs-comment"># Returns all frames if -1 is passed.</span>
</code></pre>
<pre><code class="python language-python hljs">&lt;Wave&gt; = wave.open(<span class="hljs-string">'&lt;path&gt;'</span>, <span class="hljs-string">'wb'</span>) <span class="hljs-comment"># Creates/truncates a file for writing.</span>
&lt;Wave&gt;.setframerate(&lt;int&gt;) <span class="hljs-comment"># Pass 44100 for CD, 48000 for video.</span>
@ -2390,7 +2390,7 @@ imageio.mimsave(<span class="hljs-string">'test.gif'</span>, frames, duration=<s
<div><h3 id="writefloatsamplestowavfile">Write Float Samples to WAV File</h3><pre><code class="python language-python hljs"><span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">write_to_wav_file</span><span class="hljs-params">(filename, samples_f, p=<span class="hljs-keyword">None</span>, nchannels=<span class="hljs-number">1</span>, sampwidth=<span class="hljs-number">2</span>, framerate=<span class="hljs-number">44100</span>)</span>:</span>
<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">get_bytes</span><span class="hljs-params">(a_float)</span>:</span>
a_float = max(<span class="hljs-number">-1</span>, min(<span class="hljs-number">1</span> - <span class="hljs-number">2e-16</span>, a_float))
a_float += p.sampwidth == <span class="hljs-number">1</span>
a_float += (p.sampwidth == <span class="hljs-number">1</span>)
a_float *= pow(<span class="hljs-number">2</span>, (p.sampwidth * <span class="hljs-number">8</span>) - <span class="hljs-number">1</span>)
<span class="hljs-keyword">return</span> int(a_float).to_bytes(p.sampwidth, <span class="hljs-string">'little'</span>, signed=(p.sampwidth != <span class="hljs-number">1</span>))
<span class="hljs-keyword">if</span> p <span class="hljs-keyword">is</span> <span class="hljs-keyword">None</span>:

2
parse.js
View File

@ -215,7 +215,7 @@ const AUDIO_1 =
'<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">write_to_wav_file</span><span class="hljs-params">(filename, samples_f, p=<span class="hljs-keyword">None</span>, nchannels=<span class="hljs-number">1</span>, sampwidth=<span class="hljs-number">2</span>, framerate=<span class="hljs-number">44100</span>)</span>:</span>\n' +
' <span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">get_bytes</span><span class="hljs-params">(a_float)</span>:</span>\n' +
' a_float = max(<span class="hljs-number">-1</span>, min(<span class="hljs-number">1</span> - <span class="hljs-number">2e-16</span>, a_float))\n' +
' a_float += p.sampwidth == <span class="hljs-number">1</span>\n' +
' a_float += (p.sampwidth == <span class="hljs-number">1</span>)\n' +
' a_float *= pow(<span class="hljs-number">2</span>, (p.sampwidth * <span class="hljs-number">8</span>) - <span class="hljs-number">1</span>)\n' +
' <span class="hljs-keyword">return</span> int(a_float).to_bytes(p.sampwidth, <span class="hljs-string">\'little\'</span>, signed=(p.sampwidth != <span class="hljs-number">1</span>))\n' +
' <span class="hljs-keyword">if</span> p <span class="hljs-keyword">is</span> <span class="hljs-keyword">None</span>:\n' +

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