Add more built-in brushes and pencils to the DrawTool. Currently, this can be achieved by customization of DrawTool.

Add properties for setting minimal and maximal scale factor in RadImageEditor. 

Sometimes it is better not to integrate changes directly into a bitmap. Layers will enable grouping the effects of several tools and applying/reverting the changes at a later time.
Alphachannel support in Silverlight is already available. Saving may require a proprietary file format, Paint.NET's .pdn or tiff export/import.

Currently, on each change of the image, a new instance of the image is stored in the undo/redo stack. This means that the memory grows very fast. Especially, in a scenario with big images.

Create a smarter undo/redo mechanisms that saves only the applied change in the image.

Introduce support to rotate the image for any degrees. Currently it can rotate the image on 90, 180 and 20 degrees.

Expose property (e.g. InitialPosition) that will set X and Y start in CropCommandContext from CropTool

To achieve this with the current API this you can get the CropAdorner control from the visual tree and set its CropRect property.

private void imageEditor_Loaded(object sender, RoutedEventArgs e)
{
ImageEditorRoutedCommands.ExecuteTool.Execute(new CropTool(), this.imageEditor);
var cropAdorner = this.imageEditor.FindChildByType<CropAdorner>();
cropAdorner.CropRect = new Rect(10, 10, 100, 100);
}

The user should create a custom tool if they need to change the default settings of the DrawTextTool. It would be nice to provide an easier way for achieving this.

Extend the list of predefined shapes for the ShapeTool with arrows.

Currently, the RadImageEditor control does not provide support for loading, modifying, and saving EMF and WMF files.

We could add support for these file formats.

 When user is dragging the crop rectangle, the cursor should be a hand (for example).

Enable the users to set default values for Shape tool properties (fill, stroke, thickness, border color, is ratio locked).

Introduce a special file format for RadImageEditor which enables to edit the changes made on an image. 

For example: When the user opens the image at some point in the time, he/she should be able to edit the made changes on the image - e.g. to remove the drawn text or shapes. 

Currently there isn't a way to determine if an image in the Image Editor has any changes.

There is a HistoryOnCurrentImageChanged() event which goes some way to providing the functionality, but this doesn't fire until a tool is committed.

For example, if you load an image, and select the Hue tool, and then drag the hue slider and change the image, this won't trigger the HistoryOnCurrentImageChanged() event until the user commits the tool e.g. clicks another tool or clicks off the image...

What would be perfect would be to have a HasChanges() property on the image editor that gets set to true when any aspect of the image is edited e.g. a tool slider is moved and the changes are not yet committed.

This would allow things like being able to have the the Save button disabled until the image is edited. Or being able to warn a user they are about to lose their changes if they have edited (say) the hue but have not yet committed the tool.

See also - https://www.telerik.com/forums/detecting-change 

Thanks

When a RadBitmap is rotated to degrees for which sine and cosine are not integers (every angle which is not 90, 180, 270 or 360) applies wrongly calculated transformations and the bitmap' size is no longer correct.

For example, rotating a bitmap to -30 and then to 30 degrees changes its size.

When RadBitmap objects which sources are big images (e.g. 2000x1500) are rotate, image quality loss is observed. Internally, RadBitmap.Rotate method is used.

Implement a command that opens a print dialog that allows you to print the image. There could be a print button in the RadImageEditorUI next to the "Save" and "Open" buttons.

Currently, the orientation stored in the EXIF metadata is not taken into account when showing the image.

Add support for opening EXIF files. This includes reading and preserving the EXIF metadata of the file.