The Image guide is very different form the previously seen guides, but it will be one of the most helpful ones.

Thanks to the Library, in which you would have previously stored images, you will be able to display your image references in your workspace, and even outside !
Indeed, you will be able to use the gray area around your working area to visualize drawings, roughs, backgrouns, etc, without the need to use another software.
Thanks to this display, you will have all sorts of references, litterally right under your hand ! It will be possible to draw your character's face by having his model beside, or even under !

This function is only a guide. You cannot copy, paste or select a part of the Image acting as the guide. It is once again a virtual image, not to be confused with an imported image.
The Image guide will not appear when exporting your project. However it will be very useful to pick colors with the picker.
If you close an Image guide, it will be lost and you will need to create a new one. However, if you do not close the guide, it will be present when opening your project after saving it.

By adding an Image guide, your project's Library will open instantly.

Double-click on any of these present images. The selected image appears in your working area, surrounded by a blue frame. You can move it anywhere you want with a left-click.

You then have access to all of its options in the Guidelines panel.

As for the the other guides, the first options (Eye, Opacity) have the same utility and parameters.

Opacity's adjacent parameter is at 100% by default. It does not apply to the modification frame but to the Image guide itself. You can modify this value to change your image's opacity, if you want to use the Image guide as a tracing.

The Snap and Assist functions don't exist for the Image guide.

The Center button allows you to center your Image guide on your workspace.

The Position X, Position Y, Rotation and Size parameters inform you about the position and dimensions of your Image guide. These parameters are modifiable by the mini-elevators on the right or the numeric fields.

You can also use the Edit button to have access once again to the blue frame to manually modify the Image guide.

If multiple guides have been created, you can use the icon to lock them in place while you’re editing the guide you want to modify. Note that you can only lock Line, Segment, Circle, Ellipse, and Vanishing Points guides.

This frame looks like the frame in the Transform tool or that we will see for the Camera tool : a small square at each corner to proportionally shrink or extend the image, another central square for positioning, and a circle on the right side to change the rotation.

The Path parameter inform you about the name and format of your image.
Clicking on the three adjecent little dots will open once again the Library.
If you choose another image, it will replace the original one.

A left-click on None next to the Invert option will open a sub-menu that will allow you to choose how your image is displayed : Horizontally, Vertically, or on Both axes.

Here is an example of several Image guides moved outside the working area.