Romain F. T.
rrroschan@gmail.com
Apply a transformation to the image or the current selection.

# Transform the image or the selection

These tools are available from the side bar (along with the other tools), or from a right click on a selected area.

With these tools, once you have the transformation you want, you have to apply the result with the Apply button at the right.

Otherwise you can cancel the transformation with the Cancel button at the left.

When a selection is defined, these tools will transform the selected area, otherwise they will transform the picture as a whole.

If you switch to another tool without applying the transformation explicitely, the transformation will be automatically applied if it concerns the selection, but automatically cancelled if it concerns the whole image.

If you try to save without applying the transformation, a dialog will remind you that you should apply it before saving.

# Crop

Change the size of the image, by removing parts of it. The side you're cropping is indicated by the mouse cursor: it changes depending on the position of the mouse pointer on the canvas.

The exact size can be set using the values in the bottom bar.

If your increasing the size of the image instead of decreasing it, you may need to change the zoom level to see what you're doing.

The color of the pixels you create when increasing the size is customizable, using the menu at the bottom-right of the window, or by pressing Shift and/or Alt when you click to resize.

# Scale

Resize the image, using the mouse or the values in the bottom bar.

These numerical values are in pixels by default, but it's possible to resize according to a percentage of the original image.

The proportions of the image can be locked or not, using the menu at the bottom-right of the window, or by pressing Shift when you click to resize.

# Rotate

Change the orientation of the image, or flip it, using the buttons in the bottom bar.

If a selection is defined, you can freely choose the precise angle of the rotation. Otherwise, only rotations of 90°, 180° or 270° are possible.

# Skew

This optional tool tilts the image horizontally, vertically, or in both directions.

If you're skewing the canvas, the operation creates new pixels: their color is customizable, using the menu at the bottom-right of the window, or by pressing Shift and/or Alt when you click to skew.

# Filters

You can apply a filter to the image or the selection. Click on the picture to preview the selected filter.

Change the Saturation: increase or decrease the saturation of the image by modifying the number in the bottom bar.

A saturation bigger than 100% boosts the colors, a saturation smaller than 100% does a greyish image.

Veil will add a slightly desaturated veil upon the image, with a thin grey pixelated pattern.

Add transparency can make the image partly translucent, depending on the percentage you can set in the bottom bar.

Increase contrast will increase the contrast in the picture: dark areas will be darker, light areas will be lighter, and color will be stronger. Using the option in the bottom bar, you can choose how strong the effect will be.

Blur, and several variations of it, will blur the image using a parametrable radius.

Be careful, if the image is big, applying blur to the image can take a few seconds.

Invert colors.

Here is an example of filters applied on small areas of an image: