Image Picker
The image picker control lets you select an image or, if no image is selected, a solid color.
The text on the left describes what function the selected image will have once you select it. If an image is selected, the box on the right displays a miniature version of the image. If a solid color is selected, the box is filled with the selected color. In the example above, solid white is currently selected.
Image Menu
Clicking the box brings up an image menu you can use to select an image or color:
Choosing the first menu item, Select Solid Color, brings up a color picker so you can select a solid color.
Choosing the second menu item, Load..., lets you open a file as a new top-level image and then selects that file.
Starting at the third menu item is a list of images that can be selected. Downstream images are always excluded from the image menu since selecting one of them would create a circular reference.
Image menus are sorted in descending order of image number. This places the most recently created images at the top.
Image menus highlight in red the names of any images currently selected as inputs for the current transformation.
The image menu only contains images that are upstream from the current image. Selecting a downstream image would create a circular reference and is therefore not allowed. Depending on the context in which it is being used, the image list may also be restricted to images of certain types or of a certain size in pixels.
Tips:
As an alternative to selecting images by clicking on the image menu, you can also click on an image thumbnail in the image browser while the image menu is open. If you click on an image not listed in the menu, the selection is ignored.
If you press the Esc key, or if you don't move the cursor over the image menu for 4 seconds, it closes automatically.
The image menu has scroll bars if there are more images in the list than can be displayed at once. You can use the Home, End, Up or Down arrow keys to scroll the list up or down.