Скачать или смотреть Drawing in Flutter using CustomPainter

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/// Code to take a pic

First you need to wrap CustomPaint widget with Repaintboundary and a key
RepaintBoundary(key:repaintKey, child CustomPaint:......

Now to take picture of what you have drawn can use this code

RenderRepaintBoundary boundary = globalKey.currentContext.findRenderObject();

Image image = await boundary.toImage(pixelRatio: 3.0);

ByteData byteData = await image.toByteData(format: ui.ImageByteFormat.png);

var pngBytes = byteData.buffer.asUint8List();

var bs64 = base64Encode(pngBytes);

Now you can use base64 to generate an image or share the image