Learn Phoduit

3.1.2 Canvas

The Canvas is a view into the work done by the Graph. It’s displayed underneath the Graph so your eyes can see changes without having to dart around the screen. By default, it shows you what your completed photograph looks like. As you make changes in the Graph, the Canvas is automatically updated.

Getting around the canvas

You can pan the Canvas independently from the Graph using the Pan tool. To pan the Canvas quickly, hold the Space key on your keyboard and move your mouse around. Release the Space key once you have the Canvas placed where you want it.

The Canvas can also be zoomed independently from the Graph. By default, the Canvas will be zoomed to fill the screen. You can change the scale with the Zoom tool or the Canvas Zoom combo box on the status bar. But to zoom the Canvas quickly, move your cursor over the part of the Canvas you want to zoom and scroll with your mouse. Scroll up to zoom in and scroll down to zoom out. Zooming out far enough that the Canvas is smaller than the view will automatically cause the Canvas to be centered.

If a particular render is taking a long time, consider zooming out the Canvas. This often drastically reduces how much work is required to process your photo.

Changing which node the canvas shows

Occasionally it’s useful to look at the output of a specific node or to make a before and after comparison. Phoduit lets you change the Canvas to show these instead using the Canvas View combo box on the status bar located at the bottom right. The possible choices are:

View Description


Canvas is set to the primary ( or ) node.


Canvas is set to the secondary ( or ) node.


Canvas is set to the selected node being interacted with. See selecting nodes for more details.

Hide Canvas

Canvas is hidden and cannot be interacted with.

The primary and secondary nodes are set by either, clicking a node with your right mouse button and then clicking “Primary Preview” or “Secondary Preview” with your left mouse button or selecting a node and clicking “Toggle Node as Primary Preview” or “Toggle Node as Secondary Preview” under the Edit menu at the top.

Canvas and Node Thumbnails May Not MatchThe thumbnail in the node used to display the Canvas might appear different than the Canvas itself. This is because, by default, the Canvas has its colors transformed to the color space of your display and thumbnails do not. These settings are deliberate to balance performance and to make it easier for you to manage your nodes. You can change this behavior by enabling Color Manage Thumbnails in the Preferences dialog.

Interacting with the canvas

Many nodes allow you to interact with the Canvas when selecting them. These nodes have unique functionality that is explained in detail in Chapter 9. Nodes. Some of these nodes, like the Crop node, will lock the Canvas view to their own input or output so you can make more precise changes.

Other nodes are transform aware and will transform your input as necessary. Even if the canvas has been geometrically distorted. For example, the Paint Canvas node allows you to paint directly onto a surface that has had its perspective changed.