Cropped image size is too small

[dmitryshelamov]

Cropped image size is too small

[ArXen42]

This is quite old issue, but additional comment probably won't hurt :)

It seems I encountered the same issue. Cropped image is more or less correct when using usual 24'' FHD, but when using 4K laptop display, only small part of cropped area is actually saved. I guess something is off with that DPI trickery inside GetCroppedBitmapFrame:

Matrix m       = pSource.CompositionTarget.TransformToDevice;
double dpiX    = m.M11 * 96;
double dpiY    = m.M22 * 96;

// 2) create RenderTargetBitmap
var elementBitmap = new RenderTargetBitmap(
    (int) AdornedElement.RenderSize.Width,
    (int) AdornedElement.RenderSize.Height,
    dpiX,
    dpiY,
    PixelFormats.Default
);

I personally don't need that BitmapImage related functionality, but this is probably the place to look if someone else will need this to work.

My use case is a bit different (more MVVM style): crop adorner is rendered upon preview image and I only need to get info on it's relative position and size for later batch processing. PR with these changes is almost ready if anyone else will need this.

[dmitryshelamov]

I was able to reproduce this issue.

Look like the when you load image, window do not properly resize by default.
Setting SizeToContent ="WidthAndHeight" in CroppingWindow.xaml solve this issue