Standalone Image Background and Transparency

Configurations

To change image background settings, right click on the page.

Change background color

To change background color, select Change Background Color on context menu
to open color setting dialog.

Please note that the color picker requires JavaScript to be enabled. However,
you can still change background color by entering any valid color value.

If you have NoScript extension, color picker will work if you allow the site
from NoScript menu.

Toggle checkerboard background

To toggle checkerboard background, check/uncheck Use Checkerboard Background on context menu.

Toggle image transparency

To toggle image transparency, check/uncheck Show Image Transparency on context menu.

Limitations

URL schemes

By default, this script will not run on image on local disk. To enable it:

• Greasemonkey:
  1. Type about:config?filter=fileIsGreaseable in Location Bar and press Enter.
  2. Change extensions.greasemonkey.fileIsGreaseable value to true.
  
  
• Scriptish:
  1. Open Scriptish options.
  2. On Sciptish options dialog, select Advanced tab.
  3. Turn on file protocol (Local files) in Additional protocols.

The script will not run on about: and chrome: schemes (e.g. about:logo, chrome://greasemonkey/skin/icon32.png) with Greasemonkey (see Greaseable schemes). But with Scriptish, you can enable it by repeating step 1 and 2 above, then turn on about protocol and chrome protocol in Additional protocols option.

SVG images

Context menu to configure background color doesn't work on SVG images.