Update README.md with image links.

calculator/README.md

@@ -3,7 +3,7 @@
 A simple calculator application implemented in Python using PyQt. The UI was designed in Qt Designer and the 
 calculator operations are implemented using simple stack-based logic.
 
-!(Calculon)[screenshot-calculator.png]
+![Calculon](screenshot-calculator.jpg)
 
 > If you think this example app is neat and want to learn more about
 PyQt in general, [take a look at my ebook & online course

currency/README.md

@@ -3,12 +3,12 @@
 This is a simple currency exchange rate tracker implemented in PyQt, using the [fixer.io](http://fixer.io) API
 for data. The default setup shows currency data for the preceding 180 days.
 
-![Doughnut](screenshot-currency1.png)
+![Doughnut](screenshot-currency1.jpg)
 
 Data is loaded progressively, with increasing resolution. Currency rates for a given date are shown in the right
 hand panel and updated to follow the position of the mouse.
 
-![Doughnut](screenshot-currency2.png)
+![Doughnut](screenshot-currency2.jpg)
 
 > If you think this example app is neat and want to learn more about
 PyQt in general, [take a look at my ebook & online course

mediaplayer/README.md

@@ -8,7 +8,7 @@ The main interface offers a playlist window in which you can drag-drop
 media files to be played. Standard media controls are provided, along
 with a timeline scrub widget and a volume control.
 
-![Mediaplayer](screenshot-mediaplayer1.png)
+![Mediaplayer](screenshot-mediaplayer1.jpg)
 
 For video playback you can pop out an external video viewer window
 which floats on top.

minesweeper/README.md

@@ -7,7 +7,7 @@ explore the area around your landed space rocket, without coming too close to th
 deadly B'ug aliens. Your trusty tricounter will tell you the number of B'ugs in the
 vicinity.
 
-![Moonsweeper](screenshot-minesweeper1.png)
+![Moonsweeper](screenshot-minesweeper1.jpg)
 
 This a simple single-player exploration game modelled on _Minesweeper_
 where you must reveal all the tiles without hitting hidden mines.
@@ -16,7 +16,7 @@ individually hold their state as mines, status and the
 adjacent count of mines. In this version, the mines are replaced with
 alien bugs (B'ug) but they could just as easily be anything else.
 
-![Moonsweeper](screenshot-minesweeper2.png)
+![Moonsweeper](screenshot-minesweeper2.jpg)
 
 > If you think this example app is neat and want to learn more about
 PyQt in general, [take a look at my ebook & online course

notepad/README.md

@@ -3,7 +3,7 @@
 A very simple notepad clone using the QTextEdit widget to handle more or less
 everything. Supports file loading, saving and printing.
 
-![No2Pads](screenshot-notepad.png)
+![No2Pads](screenshot-notepad.jpg)
 
 > If you think this example app is neat and want to learn more about
 PyQt in general, [take a look at my ebook & online course

notes/README.md

@@ -3,7 +3,7 @@
 Take temporary notes on your desktop, with this floating-note app. Notes
 are stored locally in a SQLite database.
 
-![Brown note](screenshot-notes.png)
+![Brown note](screenshot-notes.jpg)
 
 This app is very simple, but demonstrates creation of decoration-less windows in PyQt. Removing the window
 decorations removes the means to drag windows around, so we must re-implement this behaviour ourselves.

paint/README.md

@@ -8,14 +8,14 @@ few additions (and subtractions). The programme features standard
 tools including pen, brush, fill, spray can, eraser, text and a number of
 shapes. 
 
-![Piecasso](screenshot-paint1.png)
+![Piecasso](screenshot-paint1.jpg)
 
 You can copy from the image, with a custom shape,
 although pasting + floating is not supported. The canvas is a fixed size
 and loaded images are adjusted to fit. A stamp tool is also included
 which is pre-loaded with pictures of delicious pie.
 
-![Piecasso](screenshot-paint2.png)
+![Piecasso](screenshot-paint2.jpg)
 
 > If you think this example app is neat and want to learn more about
 PyQt in general, [take a look at my ebook & online course

solitaire/README.md

@@ -5,13 +5,13 @@ The classic card Solitaire (Klondike) game with a North Korean /
  offering the same options. Built with PyQt, it uses QGraphicsScene
  to handle the play area.
 
-![Ronery](screenshot-solitaire1.png)
+![Ronery](screenshot-solitaire1.jpg)
 
 The classic Solitaire win-screen is also implemented, although since
 the play canvas is not a bitmap it doesn't "fill up". It's still
 sufficiently satisfying. 
 
-![Ronery](screenshot-solitaire2.png)
+![Ronery](screenshot-solitaire2.jpg)
 
 The configuration options allow for 3-draw and 1 draw styles, with 3, 5
 or infinite rounds.