As Scherzo alters its layout to suit whatever screen you’re using, you need to be aware of a few things when it comes to images:
Alignment (centring and floating)
Scherzo aligns images in posts in the usual way (i.e. no alignment, float left, float right and centre).
Size
Normally, Scherzo will limit the width of an image to the width of its containing element. So if you place an image in a post which is wider than the width of the post, Scherzo will resize the image to the width of the the post, and scale the height accordingly.
Scherzo scales images across devices. If you’re viewing Scherzo on a mobile phone, images should scale to the width of the phone’s screen:

Scherzo at 280 pixels wide. The images have automatically scaled from over 800 pixels wide to fit on the screen.
This means you don’t really have to worry about the width of your images (although bigger images normally make for bigger file sizes).
Making wider images
Sometimes you may want to make an image as wide as possible. Scherzo allows you to make images span both the post width and the sidebar by adding a wide class to the image. Like so:

A wide image. Note the short sidebar.
You can add a wide class to an image by selecting the image in the post editor and accessing the Advanced Settings -> Class menu:

Add a class to an image.
Warning
Wide images encroach into the sidebar. If you have a long sidebar it’s more than likely that your wide image will make your page look odd.
Header images
Scerzo allows you to add a background image to the site header. On wide screens this is always 816 pixels wide and 144 high.
If you’re viewing Scherzo on a narrow screen then it will attempt to scale the background image. Because Scherzo limits the height of the header on narrow screens this may mean that some of your header background image is truncated.
Warning
If your header background image is largely decorative it’s unlikely this will cause any problems.
However, if you’re using the background image to replace the site title and tag line you should test to see whether it scales properly.
If you don’t have a narrow screen device to hand (such as a mobile phone that can view web pages), simply shrink your browser window until Scherzo only displays one column.
If your header background image doesn’t display satisfactorily you’ll need to change it.
Images that link to something
WordPress allows you to make images link to another web page, or another file (perhaps a larger version of the image).
By default, Scherzo will place a line underneath any image that links to something:

Sometimes you may want to remove this line.
If you want to remove this line you’ll need to head to the image’s Advanced Settings again.
This time you’ll need to add a class to the Advanced Link Settings section. In the CSS class box add the word imglink and save. This will make any line disappear.

The imglink class gets rid of underlines.