image_watermark
Image watermark is pacakge to add text on image,you can customize the position of watermark and color.
Check on pub.dev:
https://pub.dev/packages/image_watermark
Example code
var watermarkedImg = await image_watermark.addTextWatermark(
imgBytes, //image bytes
'watermarkText', //watermark text
color: Colors.green, //default : Colors.white
dstX: 20, // default : imageWidth/4
dstY: 30); // default : imageWidth/2
