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Saving Images with .NET MAUI ImageEditor

RadImageEditor control gives you the option to save the currently edited image using the SaveAsync method. The SaveAsync method has the following overloads:

  • SaveAsync(Stream outputStream, ImageFormat imageFormat, double imageQuality) Saves the currently edited image to the specified stream, encoding it with the given format and quality.

  • SaveAsync(Stream outputStream, ImageFormat imageFormat, double imageQuality, Size maximumSize) Saves the currently edited image to the specified stream, encoding it with the given format, quality and size.

  • SaveAsync(Stream outputStream, ImageFormat imageFormat, double imageQuality, double scaleFactor) Saves the currently edited image to the specified stream, encoding it with the given format, quality and scale.

where:

  • outputStream(Stream)—Specifies the output stream to save the image to.
  • imageFormat(ImageFormat)—Specifies the image format to encode the image to. The available options from ImageFormat enumeration are Jpeg, Png, Gif and Bmp. Currently, Tif is not supported.
  • imageQuality(double)—Specifies the image quality to save the image to. The range is between 1 and 0, where the value of 1 specifies the maximum possible quality, resulting in minimum compression and the value of 0 specifies the minimum possible quality, resulting in maximum compression.
  • maximumSize(Size)—Specifies the maximum size to save the image to. If the original image size is larger than the maximumSize, the SaveAsync will save the image in the submitted maximumSize but the aspect ratio will be kept.
  • scaleFactor(double)—Specifies a scale factor, which can be used to reduce the size of the final image. For example when setting values below 1 downscale the image before saving, which reducing the final image size and values above 1 upscale the image before saving, which increasing the final image size.

The saved image contains all currently applied changes in the ImageEditor.

Example for Saving Images

Here is how the RadImageEditor is defined:

<Grid RowDefinitions="Auto,*">
    <HorizontalStackLayout Spacing="5"
                           HorizontalOptions="Center"
                           VerticalOptions="Center">
        <Button Text="Original Size" Clicked="OnSaveOriginalClicked"/>
        <Button Text="Specific Size" Clicked="OnSaveMaxSizeClicked"/>
        <Button Text="Downscaled" Clicked="OnSaveDownscaledClicked"/>
    </HorizontalStackLayout>
    <telerik:RadImageEditor x:Name="imageEditor" 
                            Grid.Row="1"
                            Source="https://raw.githubusercontent.com/telerik/maui-samples/main/Samples/ControlsSamples/Resources/Images/borderconfigurationavatar.png" />
</Grid>
  • Save with original size:
private async void OnSaveOriginalClicked(object sender, EventArgs e)
{
    var folderPath = Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData);
    var filePath = Path.Combine(folderPath, "image.jpg");
    using (var fileStream = File.Create(filePath))
    {
        await this.imageEditor.SaveAsync(fileStream, ImageFormat.Jpeg, 0.9);
    }

    await Application.Current.MainPage.DisplayAlert("", "The Image is saved with original size", "OK");
}

Toolbar Visual Structure

  • Save with specific size:
private async void OnSaveMaxSizeClicked(object sender, EventArgs e)
{
    var folderPath = Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData);
    var filePath = Path.Combine(folderPath, "image.jpg");
    var maxsize = new Size(400, 500);
    using (var fileStream = File.Create(filePath))
    {
        await this.imageEditor.SaveAsync(fileStream, ImageFormat.Jpeg, 0.9, maxsize);
    }

    await Application.Current.MainPage.DisplayAlert("", "The Image is saved with Size 400:500", "OK");
}
  • Save with downscaled size:
private async void OnSaveDownscaledClicked(object sender, EventArgs e)
{
    var folderPath = Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData);
    var filePath = Path.Combine(folderPath, "image.jpg");
    using (var fileStream = File.Create(filePath))
    {
        await this.imageEditor.SaveAsync(fileStream, ImageFormat.Jpeg, 0.9, 0.5);
    }

    await Application.Current.MainPage.DisplayAlert("", "The Image is downscaled to 50%", "OK");
}

For the ImageEditor Save Image example refer to the SDKBrowser Demo Application.

See Also

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