Update book1 images, plus fixed diffuse

This is copied from PR #182, targeting the development branch. Original commentary: Ran the PNGs through pngquant+Zopfli to reduce file sizes, but as expected they are a bit larger. All the images add ~180 kilobytes to previous book size. Also the fix for "incorrect" diffuse (#181) is reflected in the screenshots. Resulting AO effect is slightly less intense than before, but more correct. Also in one place fixed source to compile and the color in the source to match the color of the sphere in the screenshot. Images in Book 2 and 3 are "not too bad"; they are larger and JPG artifacts aren't as visible there. Also they are much slower to render, and I'm lazy... :)
RayTracing · Oct 21, 2019 · 0926a57 · 0926a57
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diff --git a/books/RayTracingInOneWeekend.html b/books/RayTracingInOneWeekend.html
@@ -108,7 +108,7 @@
 Opening the output file (in ToyViewer on my mac, but try it in your favorite viewer and google “ppm
 viewer” if your viewer doesn’t support it) shows:
 
-  ![Image 2-2](../images/img-1-02-2.jpg)
+  ![Image 2-2](../images/img-1-02-2.png)
 
 </div>
 
@@ -400,7 +400,7 @@
 
 with $t$ going from zero to one. In our case this produces:
 
-  ![Image 4-1](../images/img-1-04-1.jpg)
+  ![Image 4-1](../images/img-1-04-1.png)
 
 </div>
 
@@ -494,7 +494,7 @@
 <div class='together'>
 What we get is this:
 
-  ![Image 5-1](../images/img-1-05-1.jpg)
+  ![Image 5-1](../images/img-1-05-1.png)
 
 </div>
 
@@ -565,7 +565,7 @@
 <div class='together'>
 And that yields this picture:
 
-  ![Image 6-1](../images/img-1-06-1.jpg)
+  ![Image 6-1](../images/img-1-06-1.png)
 
 </div>
 
@@ -787,7 +787,7 @@
 This yields a picture that is really just a visualization of where the spheres are along with their
 surface normal. This is often a great way to look at your model for flaws and characteristics.
 
-  ![Image 6-2](../images/img-1-06-2.jpg)
+  ![Image 6-2](../images/img-1-06-2.png)
 
 </div>
 
@@ -960,7 +960,7 @@
 Zooming into the image that is produced, the big change is in edge pixels that are part background
 and part foreground:
 
-  ![Image 7-1](../images/img-1-07-1.jpg)
+  ![Image 7-1](../images/img-1-07-1.png)
 
 </div>
 
@@ -1040,7 +1040,7 @@
 <div class='together'>
 This gives us:
 
-  ![Image 8-1](../images/img-1-08-1.jpg)
+  ![Image 8-1](../images/img-1-08-1.png)
 
 </div>
 
@@ -1077,7 +1077,7 @@
 <div class='together'>
 That yields light grey, as we desire:
 
-  ![Image 8-2](../images/img-1-08-2.jpg)
+  ![Image 8-2](../images/img-1-08-2.png)
 
 </div>
 
@@ -1308,7 +1308,7 @@
 
     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ C++ highlight
         hittable *list[4];
-        list[0] = new sphere(vec3(0,0,-1), 0.5, new lambertian(vec3(0.8, 0.3, 0.3)));
+        list[0] = new sphere(vec3(0,0,-1), 0.5, new lambertian(vec3(0.7, 0.3, 0.3)));
         list[1] = new sphere(vec3(0,-100.5,-1), 100, new lambertian(vec3(0.8, 0.8, 0.0)));
         list[2] = new sphere(vec3(1,0,-1), 0.5, new metal(vec3(0.8, 0.6, 0.2)));
         list[3] = new sphere(vec3(-1,0,-1), 0.5, new metal(vec3(0.8, 0.8, 0.8)));
@@ -1335,7 +1335,7 @@
 <div class='together'>
 Which gives:
 
-  ![Image 9-1](../images/img-1-09-1.jpg)
+  ![Image 9-1](../images/img-1-09-1.png)
 
 </div>
 
@@ -1396,7 +1396,7 @@
 <div class='together'>
 We can try that out by adding fuzziness 0.3 and 1.0 to the metals:
 
-  ![Image 9-2](../images/img-1-09-2.jpg)
+  ![Image 9-2](../images/img-1-09-2.png)
 
 </div>
 
@@ -1414,7 +1414,7 @@
 there is a refraction ray at all. For this project, I tried to put two glass balls in our scene, and
 I got this (I have not told you how to do this right or wrong yet, but soon!):
 
-  ![Image 10-1](../images/img-1-10-1.jpg)
+  ![Image 10-1](../images/img-1-10-1.png)
 
 </div>
 
@@ -1513,7 +1513,7 @@
 
 We get:
 
-  ![Image 10-2](../images/img-1-10-2.jpg)
+  ![Image 10-2](../images/img-1-10-2.png)
 
 </div>
 
@@ -1616,7 +1616,7 @@
 <div class='together'>
 This gives:
 
-  ![Image 10-3](../images/img-1-10-3.jpg)
+  ![Image 10-3](../images/img-1-10-3.png)
 
 </div>
 
@@ -1687,7 +1687,7 @@
 
 gives:
 
-  ![Image 11-1](../images/img-1-11-1.jpg)
+  ![Image 11-1](../images/img-1-11-1.png)
 
 </div>
 
@@ -1763,11 +1763,11 @@
 
 to get:
 
-  ![Image 11-2](../images/img-1-11-2.jpg)
+  ![Image 11-2](../images/img-1-11-2.png)
 
 And we can change field of view to get:
 
-  ![Image 11-3](../images/img-1-11-3.jpg)
+  ![Image 11-3](../images/img-1-11-3.png)
 
 </div>
 
@@ -1883,7 +1883,7 @@
 
 We get:
 
-  ![Image 12-1](../images/img-1-12-1.jpg)
+  ![Image 12-1](../images/img-1-12-1.png)
 
 </div>
 

diff --git a/images/img-1-02-2.jpg b/images/img-1-02-2.jpg
diff --git a/images/img-1-02-2.png b/images/img-1-02-2.png
diff --git a/images/img-1-04-1.jpg b/images/img-1-04-1.jpg
diff --git a/images/img-1-04-1.png b/images/img-1-04-1.png
diff --git a/images/img-1-05-1.jpg b/images/img-1-05-1.jpg
diff --git a/images/img-1-05-1.png b/images/img-1-05-1.png
diff --git a/images/img-1-06-1.jpg b/images/img-1-06-1.jpg
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diff --git a/images/img-1-06-2.png b/images/img-1-06-2.png
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diff --git a/images/img-1-10-1.png b/images/img-1-10-1.png
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diff --git a/images/img-1-10-2.png b/images/img-1-10-2.png
diff --git a/images/img-1-10-3.jpg b/images/img-1-10-3.jpg
diff --git a/images/img-1-10-3.png b/images/img-1-10-3.png
diff --git a/images/img-1-11-1.jpg b/images/img-1-11-1.jpg
diff --git a/images/img-1-11-1.png b/images/img-1-11-1.png
diff --git a/images/img-1-11-2.jpg b/images/img-1-11-2.jpg
diff --git a/images/img-1-11-2.png b/images/img-1-11-2.png
diff --git a/images/img-1-11-3.jpg b/images/img-1-11-3.jpg
diff --git a/images/img-1-11-3.png b/images/img-1-11-3.png
diff --git a/images/img-1-12-1.jpg b/images/img-1-12-1.jpg
diff --git a/images/img-1-12-1.png b/images/img-1-12-1.png
diff --git a/images/img-1-13-1.jpg b/images/img-1-13-1.jpg