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### 6.4. Canvas Size

#### Overview

The canvas is the visible area of the image. By default the canvas coincides with layers. This function allows you to enlarge or to reduce the canvas size without modifying content of the layers the image contains. When you enlarge it you create free space around the image content. When you reduce it, the visible area is cropped, however the layers still extend beyond the canvas border.

#### Canvas 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, e.g. percents, if you want set new dimensions relatively to the current dimensions. 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.

Whatever unit you use, there is always information about the matching size in pixels and currently set resolution below the Width and Heigth fields. You cannot change the resolution in this dialog, if you want to do it, use the Print Size dialog.

#### Offset

Offset is used to place the image on canvas. The preview displays the image as a frame with a thin border and the canvas, when it is smaller than 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

When you click on the Resize, the cavas is resized, but the pixel information in the image is not changed and the drawing scale is unchanged.

Because the added part of canvas doesn't contain layers (if layers hadn't been extending beyond the canvas border before the change), it is transparent with a checker look and is not immediately available for painting. You can either flatten the image, in which case you will get an image with a single layer fitting the canvas exactly, or you can use Layer to Image Size command resize the active layer only, without changing any other layers. 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).

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