imagemauilinear-gradientslineargradientbrush

LinearGradientBrush on Image not working and not getting more transparent towards the bottom

I wanted to load an Image which is basically in a very dark like black-isch Color and add a LinearGradientBrush to it, so that it gets more which to the Bottom.

In a Grid, I used an Image and added the following LinearGradientBrush from "Transparent" at the top (to see the image in original colors) to "White" a the bottom to see it getting more "transparent" to my white ContentPage background:

<Image Grid.Row="0" 
       Grid.Column="0" 
       Grid.ColumnSpan="3" 
       Source="myImage.jpg" 
       Aspect="AspectFill" 
       HeightRequest="300"
       x:Name="myImage">

    <Image.Background>
        <!-- StartPoint defaults to (0,0) -->
        <LinearGradientBrush EndPoint="0,1">
            <GradientStop Color="Transparent" Offset="0.1" />
            <GradientStop Color="White" Offset="1.0" />
        </LinearGradientBrush>
    </Image.Background>

</Image>

Unfortunately, this does not work at all and I see the original image without gradient:

enter image description here

I also tried a LinearGradientBrush with different Colors on my Background to see if it is working with these values at all:

LinearGradient with 2 Colors

Expected: What I wanted to see is a LinearGradient as in the Background-Image here, so that the Image gets more trasparent to the Bottom. I also believe, that this Gradient should end earlier from top to bottom so that it gets white earlier then. Maybe could also work with a smaller height of the Image, don't know what's the best option:

enter image description here

============= Another try... =======================

I tried with with this [Photo][4] which I renamed to myImage.jpg

Here, I use a Grid and place the photo and the ScrollView into the same Row/Column. Also tried with ZIndex.

Seems like the impact of the Gradient-Brush is not smooth enough here. At the very top it is too foggy and at the very bottom not fading out to white enough. Do you understand this Gradient enough to explain how

<Grid RowDefinitions="Auto,*" ColumnDefinitions="*,*">
                
    <Image Grid.Row="0" 
           Grid.Column="0" 
           Grid.ColumnSpan="3" 
           Source="myImage.jpg" 
           Aspect="AspectFill" 
           HeightRequest="500"
           x:Name="myImage" />
    
    <ScrollView Grid.Row="0" Grid.Column="0" WidthRequest="800" Margin="0, -190, 0, 0">
        
        <ScrollView.Background>
            <LinearGradientBrush EndPoint="0,1">
                <GradientStop Color="Transparent" Offset="0.1" />
                <GradientStop Color="White" Offset="1.0" />
            </LinearGradientBrush>

            <!--<RadialGradientBrush>
                <GradientStop Color="Transparent" Offset="0.1" />
                <GradientStop Color="White" Offset="1.0" />
            </RadialGradientBrush>-->
        </ScrollView.Background>
        
    </ScrollView>

</Grid>
Solution

  • I also tested Image or Frame Officially provided, but failed like yours.

    You want this effect?

    You can set child element background linear gradient:

    <ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:local="clr-namespace:MauiApp1"
             x:Name="this"
             x:Class="MauiApp1.MainPage"
             BackgroundImageSource="ddd.png"
             Shell.NavBarIsVisible="False">

   <ScrollView>
        <ScrollView.Background>
            <LinearGradientBrush EndPoint="0,1">
                <GradientStop Color="Transparent"
                          Offset="0.1" />
                <GradientStop Color="White"
                          Offset="1.0" />
            </LinearGradientBrush>
        </ScrollView.Background>

        <VerticalStackLayout
            Spacing="25"
            Padding="30,0"
            VerticalOptions="Center">            
         
            <!--<Image Source="ddd.png">
                <Image.Background>
                    <LinearGradientBrush EndPoint="0,1">
                        <GradientStop Color="Black" Offset="0.1" />
                        <GradientStop Color="Transparent" Offset="1.0" />
                    </LinearGradientBrush>
                </Image.Background>
            </Image>-->


           <Button Text="Open window" Command="{Binding Source={x:Static local:ViewModel.Instance}, Path=OpenNewWindowCommand}"/>
           <Button Text="Show alert" Clicked="Button_Clicked" />

       </VerticalStackLayout>
    </ScrollView>

</ContentPage>

    Update

    About The Gradient is not "smooth" enough, though. Like ewerspej said, you can add more GradientStop objects. Refer to Create a vertical linear gradient:

    Then, add two or more GradientStop objects to the LinearGradientBrush.GradientStops collection, that specify the colors in the gradient and their positions.