This menu contains commands that affect all layers of the current image. This contrasts with the Layers Menu commands, which only affect the current active layer.
The following image is the original image we will be using for the examples:
This menu item is only available if a selection is active. Clicking on this menu item will cause the entire image to be replaced with the area that was selected. If the selection is not rectangular or square, then the bounding rectangle around the selection will be used. Pixels outside of the selection will be made transparent.
Here we have selected the area we want to crop using the Lasso selection tool
Here is the new image after having clicked on the Crop to Selection menu item. Note that the bounding rectangle of the selection outline was used to determine the new image's size, but that any pixel that was outside of the selection was made transparent.
The checkerboard pattern is used to indicate areas of the image that are transparent. The pattern is not actually part of the image.
This command lets you change the size of the image. The image is either enlarged or reduced to the size you specify. You may specify either a relative percentage to resize the image by, or an absolute pixel or print size. If the "Maintain aspect ratio" option is checked, then typing a new Width value will maintain a proportional Height value, and vice versa.
If you choose to modify the print size of an image, the pixel size will be based on the resolution (DPI), which defaults to 96 pixels per inch (37.8 pixels per centimeter). For example, if you specify the image to be 1 inch wide, and the resolution is 96 pixels/inch, then the image will be resized to a width of 96 pixels.
You can use this dialog to affect the print size of an image by adjusting just the resolution. Note that if you only modify the resolution of the image, the pixel size will remain the same and no resampling is performed.
There are multiple types of resampling that you may choose. "Resampling" is the process of computing what the new pixels should be based on existing pixels. Some algorithms produce better looking results, but take longer to complete. It is recommended that you use the default option, "Best Quality," unless you have a specific need for and understanding of the other choices (Bilinear, Bicubic, and Nearest Neighbor). Best Quality will automatically choose either Bicubic or Super Sampling depending on the new size that you specify.
Enlarged using Resize command.
Shrunk using Resize command.
Depending on the type of image that you are shrinking, you may want to use the Sharpen effect with a value of 1 or 2 after using the Resize command.
This command lets you enlarge or shrink the image canvas without affecting the size of the image. If the image canvas is enlarged, the new area will be filled with the secondary color. If the canvas is reduced, the edges of the existing image outside of the canvas area will be cropped out. It works similarly to the Resize dialog, but adds an Anchor selection, which determines the point the canvas will be enlarged/reduced from.
After enlarging the canvas and using the center anchor point (the secondary color is set to white in this case)
After shrinking the canvas and using the center anchor point
These menu items allows you to flip the image horizontally or vertically.
After flipping the original image horizontally
These menu items gives you several commands for rotating the image by 90 degrees (in either the clockwise or counter-clockwise directions) or by 180 degrees.
After being rotated 90 degrees clockwise
This takes the multiple layers of an image and combines them into one layer. It is only available if the image has more than one layer.