added smoke

_subsections/chapter05.org

@@ -61,6 +61,7 @@
  - multiply darkens
  - ignores white
  - multiplies dark onto image
+ - keeps the black and hides the white
 
 *** technique 1
 - duplicate an image
@@ -76,3 +77,17 @@
 - find an adjustment layer that changes nothing by default
 - set it to multiple
 - it effectively acts as a duplicate image
+
+** screen blend mode
+- opposite of multiply
+- brightens
+  - black hides, white stays
+
+*** using screen for brightening
+1. create a levels adjustment layer
+2. change the adjustment layer to screen
+3. if the sky for example is too bright
+   1. open blending
+   2. go to underlying layer section
+   3.  move the right slider to the left
+      - split it apart using the OPT key