Compress image to specific size in Flutter App

Question

is there any way to compress image based on the image size? I want the output to be 100 to 200 KB for any input image for my Flutter app.

I tried using flutter_image_compress but it compresses based on quality not on size.

Answer 1

Quality == Size

with this you determine your image in uint8list

Future<Uint8List> testCompressFile(File file, int quality) async {
    var result = await FlutterImageCompress.compressWithFile(
      file.absolute.path,
      minWidth: 2300,
      minHeight: 1500,
      quality: 100 - quality,
      rotate: 90,
    );
    print(file.lengthSync());
    print(result.length);
    return result;
  }

this will print the size in bytes

print(uint8ListImage.lengthInBytes);

if the image exceeds 200 kB, you call up the function to the right size (quality)

Future<Uint8List> compressImageToLower200kB(File file){
 for( int i = 0 ; i<100 ; i ++ ) {
Uint8List imageCompressed = await testCompressFile(file, i);
  if(imageCompressed.lengthInBytes <200000){
return imageCompressed;
 }
}