Revision Date: 27 August 2015

Image Menu

This menu contains commands that affect all layers in the current image.  This contrasts with the Layers Menu commands, which only affect the active layer.

Image Menu Image Menu

Image Crop to Selection icon Crop to Selection

This menu item is only available if a selection is active.  Clicking this menu item will cause the current image to be cropped and replaced by the area that was selected.

If the selection is not rectangular or square, the bounding rectangle minimally surrounding the selection will be used.  Pixels outside the selection will be made transparent.



Lasso Select

Here a selection has been made around the car using the Lasso tool

Crop to Selection

Following Crop To Selection the image has been resized to minimally encompass the previously selected area.  Pixels lying outside the selection have the checkerboard pattern which denotes transparency.


The checkerboard pattern is used to indicate areas of the image that are transparent.  This pattern not a part of the image and will not be seen outside of's editing environment.

Image Resize icon Resize

This command changes the size of the image. The image can be either enlarged or reduced to the size specified.  Clicking the menu item opens the following dialog.

Resize Resize Dialog

The Resize dialog can also be opened by pressing Ctrl + R

"Resampling" is the process of computing how new pixels appear based on the existing pixels. There are four types of resampling that can be chosen.  Some algorithms produce better looking results, but take longer to complete.

Resize Resampling Modes Resize Resampling Modes

It is recommended that the default option, "Best Quality," is used unless there is a specific need for, and understanding of, the alternatives (Bicubic, Bilinear and Nearest Neighbor).

Best Quality will automatically choose either Bicubic or Super Sampling depending on the new size.

Two resize modes are By percentage and By absolute size.  These offer the option of changing the size by a percentage or specifying a new Height and/or Width.

If the "Maintain aspect ratio" option is checked, typing a new Width value will maintain a proportional Height value, and vice versa.

The print size is calculated based on the resolution (DPI).

Pixel Size / DPI = Print Size

This formula can be rewritten Print Size x DPI = Pixel Size

For example if an image is specified to be printed at two inches wide, and the resolution is set to 96 pixels/inch, then the image will be resized to a width of 96 x 2 or 192 pixels.  This is how many pixels will be required to make the image two inches wide when printed at a density of 96 dots-per-inch.




Enlarged using Resize command.


Shrunk using Resize command.

Depending on the type of image that is being resized, using the Effects → Photo → Sharpen effect can enhance details softened by the Resize command.

Image Canvas Size icon Canvas Size

This command enlarges or shrinks the canvas without affecting the size of the image on it.

Canvas Size Canvas Size Dialog

Canvas Size works similarly to the Resize dialog, but adds an Anchor selector and removes the Resampling options. The anchor determines the point the canvas will be enlarged/reduced from.

If the canvas is enlarged, the new area will be filled with transparent pixels.  If the canvas is reduced, the edges of the existing image outside of the new canvas area will be cropped.



Canvas Enlarged

After enlarging the canvas using the center anchor point

Canvas Shrunk

After shrinking the canvas with a center anchor point

Image Flip Horizontal icon Flip Horizontal, and Image Flip Vertical icon Flip Vertical

These menu items allow the image to be flipped horizontally or vertically. Remember - ALL layers will undergo this transformation.



Flipped Horizontally

Flipping the image horizontally

Image Rotate 90 Degrees icon Rotate 90 ° Clockwise
Image Rotate 90 Degrees Counter-clockwise icon Rotate 90 ° Counter-Clockwise
Image Rotate 180 Degrees icon Rotate 180 °

The next three menu items rotate the image by 90° (in either clockwise or counter-clockwise directions) or by 180 degrees.



Rotated 90 degrees

Rotation by 90° clockwise

Image Flatten icon Flatten

This action takes an image with multiple layers and combines them into a single layer.

The action becomes available only when an image has more than one layer.