Keys | Result
Space bar | Toggle between selecting and deselecting the highlighted image or images.
Arrow keys | Move which image is selected in the direction of the arrow key.
SHIFT + left-click | Select all the images between the starting image and the last image you click on.
SHIFT + arrow keys | Select a continuous sequence of images in the direction of the arrow key.
CTRL + left-click | Select all the images you click on.
CTRL + arrow keys | Move the image selection highlight in the direction of the arrow key.
CTRL + SHIFT + arrow keys | Highlight a continuous sequence of images in the direction of the arrow key.
CTRL + A | Select all images.