6.4. Canvas Size

Overview

The canvas is the area you can paint. By default the canvas coincides with the image. This function allows you to enlarge or to reduce the canvas size without modifying the image it contains. When you enlarge it you create a border around the image. When you reduce it you crop the image.

Size

You can set the Width and the Heigth you want give to the canvas. Default unit is pixel but you can choose another one.

Ratio is the ratio between the original dimension and the new dimension, for each X and Y axis. Default is 1. You can change it. If the adjacent Chain is intact both axis will develop jointly. If you break it by clicking on it, then you can set every axis separately.

Offset

Offset is used to place the image on canvas. The preview displays the image as a frame with a gray border and the canvas, when it it different from the image, as a frame with a thin black border.

X and Y parameters are the coordinates of the upper left corner of the image against the same corner of the canvas. They are negative when canvas is smaller than image. You can change them thanks to the text boxes. Default unit is pixel but you can choose another one. When the mouse pointer is in a box you can use the Up and Down arrow keys to change pixel value one by one. When Shift is pressed in change is ten by ten.

The Center button allows you to place the image center onto the canvas center.

[Note] Note

When you click on the OK button the new image version takes the size of canvas, but the drawing scale is unchanged.

The added part of canvas is transparent with a checker look and is not immediately available for painting. You have to flatten it. You can also create a new layer and fill it with the background you want. You create so a digital passe-partout (a passe-partout is a kind of glass mount whose bottom can opened so that you can slip a photo into it).