Scaling image with paintImage only draws list of Offset in corner of image

Question

In the Flutter app I am working on I am attempting to make it, so you can take an image and draw on it then upload it. However, I am running into an issue where the drawn lines are only in the top left corner of the image.

I am using dart:UI CustomPainter with the paintImage function to do this. I can't find where I'm making a scaling issue.

Here is my function:

final ui.Image image;
    onPressed: () async {
              var recorder = ui.PictureRecorder();
              var imageCanvas = Canvas(recorder);
              var painter =  Sketcher(lines: lines, image: widget.image, context: context, showImage: false);

              paintImage(
                  canvas: imageCanvas,
                  rect: Rect.fromLTWH(0, 0, image.width, image.height),
                  image: image,
                  fit: BoxFit.scaleDown,
                  repeat: ImageRepeat.noRepeat,
                  scale: 1.0,
                  alignment: Alignment.center,
                  flipHorizontally: false,
                  filterQuality: FilterQuality.high
              );
                painter.paint(imageCanvas, widget.size);
    
                  var picture = recorder.endRecording();
                  ui.Image im = await picture.toImage(widget.size.width.floor(), widget.size.height.floor());
    
                  Navigation.of(context).push(MaterialPageRoute(builder: (context) => UploadScreen(image: im)));
            }

painter class:

class DrawnLine {
  final List<Offset> path;
  final Color color;
  final double width;

  DrawnLine(this.path, this.color, this.width);
}

class Sketcher extends CustomPainter {
  final List<DrawnLine> lines;
  final ui.Image image;
  final BuildContext context;
  final bool showImage;


  Sketcher({required this.lines, required this.image, required this.context, required this.showImage,});


  @override
  void paint(Canvas canvas, Size size) {
    Paint paint = Paint()
      ..color = Colors.redAccent
      ..strokeCap = StrokeCap.round
      ..strokeWidth = 5.0;

for (int i = 0; i < lines.length; ++i) {
        if (lines[i] == null) continue;
        for (int j = 0; j < lines[i].path.length - 1; ++j) {
          if (lines[i].path[j] != null && lines[i].path[j + 1] != null) {
            paint.color = lines[i].color;
            paint.strokeWidth = lines[i].width;
            canvas.drawLine(lines[i].path[j], lines[i].path[j + 1], paint);
          }
        }
      }

      canvas.save();
      canvas.restore();
    }

  @override
  bool shouldRepaint(Sketcher oldDelegate) {
    return true;
  }
}