Removing ImageView border

I have a vertically oriented LinearLayout that has a child LinearLayout that includes a TextView, an EditText, and a Button, and a child ImageView.

So something like:

<LinearLayout>
   <LinearLayout>
        <TextView>
        <EditText>
        <Button>
   <ImageView>

And the problem I am experiencing is that the seperation between the LinearLayout and the ImageView (displaying a .png as a background with android:background="@drawable/sun") is displaying a visible crease in between them. I have the LinearLayout using the same background color as the .png so that it looks like they flow together, but the crease ruins that aspect.

Edit: Here's a screenshot!

Do you see the thin line under the submit button?

Here is the xml:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="@color/lightblue"

    >
    <TextView  
        android:layout_width="fill_parent" 
        android:layout_height="wrap_content" 
        android:text="@string/welcome"
        android:textSize="17sp"
        android:textColor="@color/black"
    />
    <EditText 
        android:id="@+id/entry" 
        android:layout_width="fill_parent" 
        android:layout_height="wrap_content" 
        android:hint="@string/hint_text"
        android:textSize="25sp"
        android:inputType="text"
    />
    <Button
        android:id="@+id/submitButton"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:textSize="25sp"
        android:text="Submit"
    />
    <FrameLayout
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:paddingTop="0px"
    >
    <ImageView
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:background="@drawable/sunclouds"
        android:layout_marginBottom="20dip"/>
    <TextView
        android:id="@+id/marq"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginBottom="10dip开发者_如何学C"
        android:layout_gravity="center_horizontal|bottom"
        android:textColor="@color/black"
        android:text="@string/provider"
        android:marqueeRepeatLimit="marquee_forever"
        android:ellipsize="marquee"
        android:focusable="true"
        android:focusableInTouchMode="true"
        android:singleLine="true"
        android:scrollHorizontally="true"

        />
    </FrameLayout>

</LinearLayout>

How can I fix this?

(side note, my sun and cloud have rough edges, any quick fixes with gimp?)

As a reference for someone who does not have the patience to go through the comments, the real problem was that the exported image had a thin line which the OP had corrected. In any case, the following are the list of reasons why this could happen:

• The exported image has a thin line - This can usually be solved by drawing a small rectangle over the line. If not, then slice a 1px version of the image and put it on top of this line to cover it up. It generally works fine.
• When exporting if you set the line color - To solve this remove the line color. Either set it to the same color as the image or remove it altogether.