The full-screen viewer supports a numerous set of options. One of the more
important is the High Quality scaling which is enabled by default. It makes
the viewing of image slightly slower but dramatically improves display quality.
Check this sample to get an idea: this image is slightly bigger than my display.
To display it full-screen it therefore has to be scaled down a bit. On the
left is a crop without the HQ scaling. On the right is the same crop with the
HQ option on... See for yourself!
Other options include zooming, automatic fitting to the screen and much more.
Zooming is done with the + and - keys. Once you have zoomed to a point where
the image is larger than your display then you can move the image with the
arrow keys or by dragging the image.
The default options should be okay for most users. If you want to change them
you probably know what you are doing... One remark: it is not recommended to
enable auto-fitting and enlarge as this will display any image (even very small
images) full-screen which could lead to a very poor display.
You can also display file information over the image. There are different levels
of information you can display. You can toggle the display by pressing the I
(as in 'I am') key. You can change the foreground color and the background mode
in the Options dialog. If the color chosen is not readable for a particular
image you can try to cycle thru different colors with the C key.
Lastly, if you want to inspect the color of a particular pixel, select the "Toggle
Pixel-Under-Cursor Display" option in the contextual menu. The color of
the pixel under the cursor will be displayed in the lower left corner of the
screen. Move the cursor over the image to inspect other pixels.