Show each denoise method in the manual as a close-up

The manual's AI denoise section names the four methods and their measured
times, and shows the lamp and railing of the ISO 8000 frame at 1:1 by each
in place of the film and the before/after pair. The scene clicks each
method and waits for that network's result: the repair now logs its own
"learned denoise:" line first, so the wait matches the result's.

docs/manual/index.html

@@ -292,19 +292,35 @@ the sensor recorded.</p>
 <p>How every raw is developed. <code>AI Denoise</code>, at the top of the Adjust panel,
 replaces how the camera's raw data is turned into colour: a network trained
 on this library's own photographs removes the noise and the blotches of
-colour that come with it, while keeping the fine detail. It is on for every
-raw unless you switch it off with <code>Apply</code>. Look at it at 1:1, where noise
-lives.</p>
+colour that come with it, while keeping the fine detail. Look at it at
+1:1, where noise lives.</p>
+<p><code>Method</code> chooses how:</p>
+<ul>
+<li><code>Best</code>, the default: two networks, one for smooth areas and one for
+edges, blended where each is better. The cleanest skies and the sharpest
+lettering, and the slowest.</li>
+<li><code>Medium</code>: one network taught by <code>Best</code>. Nearly as clean in smooth areas,
+a little softer on hard edges, in about a third of the time.</li>
+<li><code>Fast</code>: a smaller one, taught the same way. Visibly noisier at very high
+ISO than the other two, but still far cleaner than none, and quick.</li>
+<li><code>Bilinear</code>: the camera's ordinary conversion, noise and all.</li>
+</ul>
 <p>The photograph shows the camera's ordinary conversion while the network
 works, with its progress in the bar at the top, and changes when it is
-done — a few seconds on a computer with a graphics card, about
-fifteen on its processor alone, longer on the tablet. The result is kept,
-so a photograph opened again, or exported, does not wait a second time.
+done — on a laptop's graphics card, about two and a half seconds for a
+20-megapixel photograph with <code>Best</code> and under one with the other two;
+longer on a processor alone or on the tablet. The first photograph after
+installing waits a few minutes more while the graphics card prepares each
+network, once. The result is kept, so a photograph opened again,
+or exported, does not wait a second time, and switching back to a method
+already used is quick.
 <code>Strength</code> eases it off: below 100 % it puts back some of what was removed,
 as grain without colour, for a picture that does not look too smooth.</p>
-<figure><img loading="lazy" src="media/develop-denoise.gif" alt="An ISO 8000 night frame at 1:1, AI Denoise switched on, then some grain kept"><figcaption>An ISO 8000 night frame at 1:1, AI Denoise switched on, then some grain kept</figcaption></figure>
-<table><thead><tr><th>Before</th><th>After</th></tr></thead><tbody>
-<tr><td><img src="media/develop-denoise-before.png" alt="The railing and the lamp at ISO 8000, as the camera recorded them" /></td><td><img src="media/develop-denoise-after.png" alt="The same, with AI Denoise" /></td></tr>
+<p>The lamp and railing of a night frame at ISO 8000, at 1:1, by each method:</p>
+<table><thead><tr><th>Bilinear</th><th>Fast</th></tr></thead><tbody>
+<tr><td><img src="media/develop-denoise-bilinear.png" alt="The railing and the lamp at ISO 8000, as the camera recorded them" /></td><td><img src="media/develop-denoise-fast.png" alt="The same, with the Fast network" /></td></tr>
+<tr><td><strong>Medium</strong></td><td><strong>Best</strong></td></tr>
+<tr><td><img src="media/develop-denoise-medium.png" alt="The same, with the Medium network" /></td><td><img src="media/develop-denoise-best.png" alt="The same, with the Best network" /></td></tr>
 </tbody></table>
 <p>It works on raw files from any camera with the usual colour pattern of
 red, green and blue squares — not on JPEGs, and not yet on Fujifilm's
@@ -312,7 +328,7 @@ X-Trans. How noisy the camera is at each ISO was measured for the Canon
 EOS 6D; for other cameras it is read from a DNG's own figures or
 estimated from the photograph, and the finished job in the activity list
 says which. An export uses
-it whenever the photograph has it switched on.</p>
+the method the photograph has.</p>
 <h3 id="moving-between-photographs">Moving between photographs</h3>
 <p>The roll along the foot of the canvas holds the photographs the grid was
 showing; click one to open it. The right arrow, <code>D</code> or space opens the next,