crazecoder / flutter_luban

An image compress package like Luban for Dart

flutter_luban

An image compress package like Luban for Dart, based on image.This library has no system platform constraints.

Example

   CompressObject compressObject = CompressObject(
         imageFile:imageFile, //image
         path:tempDir.path, //compress to path
         quality: 85,//first compress quality, default 80
         step: 9,//compress quality step, The bigger the fast, Smaller is more accurate, default 6
         mode: CompressMode.LARGE2SMALL,//default AUTO
       );
    Luban.compressImage(compressObject).then((_path) {
        setState(() {
          print(_path);
        });
    });

flutter_luban's Issues

压缩手机拍的图片有点慢

挺慢的

FileSystemException

Unhandled Exception: Exception: FileSystemException: Cannot open file, path = '/data/user/0/com.example.compress_image_demo/cache/scaled_91926534-c6ab-492c-9318-98d38850098b1214548903574526107.jpg/img_1650868354290.jpg' (OS Error: Not a directory, errno = 20)

Compiler message:

Compiler message:
../../../Desktop/flutter/.pub-cache/hosted/pub.flutter-io.cn/zoomable_image-1.3.1/lib/src/zoomable_image.dart:174:30: Error: The argument type 'void Function(ImageInfo, bool)' can't be assigned to the parameter type 'ImageStreamListener'.

• 'ImageInfo' is from 'package:flutter/src/painting/image_stream.dart' ('../../../Desktop/flutter/packages/flutter/lib/src/painting/image_stream.dart').
• 'ImageStreamListener' is from 'package:flutter/src/painting/image_stream.dart' ('../../../Desktop/flutter/packages/flutter/lib/src/painting/image_stream.dart').
  _imageStream.addListener(_handleImageLoaded);
  ^
  ../../../Desktop/flutter/.pub-cache/hosted/pub.flutter-io.cn/zoomable_image-1.3.1/lib/src/zoomable_image.dart:186:33: Error: The argument type 'void Function(ImageInfo, bool)' can't be assigned to the parameter type 'ImageStreamListener'.
• 'ImageInfo' is from 'package:flutter/src/painting/image_stream.dart' ('../../../Desktop/flutter/packages/flutter/lib/src/painting/image_stream.dart').
• 'ImageStreamListener' is from 'package:flutter/src/painting/image_stream.dart' ('../../../Desktop/flutter/packages/flutter/lib/src/painting/image_stream.dart').
  _imageStream.removeListener(_handleImageLoaded);
  ^
  Target kernel_snapshot failed: Exception: Errors during snapshot creation: null
  Failed to build bundle.
  Error launching application on iPhone 11 Pro Max.

Compress multiple files

I have list of files like (sample1.jpg, sample2.jpg, sample3.jpg, ...). I want to compress those files before upload it. I plan to use Dio to upload it. Can you help me the code to do that?

Flutter Web Support ?

This package uses dart:io which is not compatible with flutter web. Can you add web support to this lib? Without dart:io.

Add flutter web support.

Hello,
I am wondering if we could support flutter web.

This could be done by make the input and output images data type uint8list.
Meaning add field Uint8list dataBytes to CompressObject() function and Luban.compressImage() return Uint8list.

Thanks

这个库不会再更新了么?

如题

一直卡在压缩这，代码如下

`final newCompressedPicpath = join((await getTemporaryDirectory()).path, '${DateTime.now().millisecondsSinceEpoch}.png');

CompressObject compressObject = CompressObject(
  imageFile: File(picturePath),
  path: newCompressedPicpath,
  quality: 80,
  step: 9,
  mode: CompressMode.AUTO
);
var path =await (Luban.compressImage(compressObject));`

压缩速度太慢了

image 处理图片的速度一直很慢，作者有计划换其他的实现吗？

现在处理一张1080x1920的图片大概要3秒多。

不过压缩效果极好！

I get this error after upgrading flutter to latest version 1.12.13+hotfix.5

Flutter 1.12.13+hotfix.5 • channel stable

Because every version of flutter_test from sdk depends on image 2.1.4 and flutter_luban 0.1.9+2 depends on image ^2.1.9, flutter_test from sdk is incompatible with flutter_luban 0.1.9+2.

压缩报错

CompressObject compressObject = CompressObject(
imageFile: File('/storage/emulated/0/fluttera/349.jpg'),
path: '/storage/emulated/0/fluttera/15882605447.jpg',
quality: 80,
step: 9,
mode: CompressMode.AUTO
);
var path =await (Luban.compressImage(compressObject));

[ERROR:flutter/lib/ui/ui_dart_state.cc(157)] Unhandled Exception: Exception: FileSystemException: Cannot open file, path = '/storage/emulated/0/fluttera/15882605447.jpg/img_1588261036457.jpg' (OS Error: No such file or directory, errno = 2)

用的最新版的flutter 和Dart ,图片是本地已经存在的,不知道为什么会提示找不到 报错

咋压缩之后图片纵横比例变了

Unable to compress multiple images in a for loop

I am developing a Flutter desktop app for macOS. I have 100 images that I need to compress. If I call the compress function inside a for loop, the whole UI freezes and crashes the app.

压缩时间比较长 需要十几秒

不知道是不是我的代码有问题, 图片是 1920*1080的屏幕截图
Future getImage() async { await ImagePicker.pickImage(source: ImageSource.gallery).then((file) async { CompressObject compressObject = CompressObject( imageFile: file, //image path: file.parent.absolute.path, ); return Luban.compressImage(compressObject); }).then((_path) { setState(() { imgUrlList.clear(); imgUrlList.add(_path); }); }); }

images from camera squished

Whenever I take a photo and compress it gets sized weirdly

无法打开图片文件

[ERROR:flutter/lib/ui/ui_dart_state.cc(148)] Unhandled Exception: Exception: FileSystemException: Cannot open file, path = '/data/user/0/com.example.im_flutter/cache/Android.jpg/img_1571561019173.jpg' (OS Error: No such file or directory, errno = 2)

Compressed image aspect ratio problem

I compressed an image but the aspect ratio of compressed image changed like it. How fix the problem?

不支持.PNG格式但是支持.png格式

如题

请教关于png压缩成文件，如果进行递归减少文件的size

您好！
请教一下，这段代码是如何通过递归减少文件size的，level这个参数的作用是什么？
谢谢指点
static void _compressPng({ Image image, File file, level: 9, targetSize, }) { var im = encodePng(image, level: level); var tempImageSize = Uint8List.fromList(im).lengthInBytes; if (tempImageSize / 1024 < targetSize) { _small2LargeCompressImage( image: image, file: file, targetSize: targetSize, isJpg: false, ); return; } file.writeAsBytesSync(im); } }

compressImageList: Null check operator used on a null value

Code & error:

    final compressionList = <CompressObject>[];
    for (final image in images) {
      compressionList.add(
        CompressObject(
          imageFile: File(image.path),
          quality: 30,
          step: 9,
        ),
      );
    }

    final compressedImages = <XFile>[];
    await Luban.compressImageList(compressionList).then((paths) {  // <= Exception here
      for (final path in paths) {
        if (path != null) {
          compressedImages.add(XFile(path));
        }
      }
    });

E/flutter (26892): [ERROR:flutter/lib/ui/ui_dart_state.cc(198)] Unhandled Exception: Null check operator used on a null value
E/flutter (26892): #0      Luban._lubanCompress (package:flutter_luban/src/flutter_luban.dart:91:22)
E/flutter (26892): #1      Luban._lubanCompressList.<anonymous closure> (package:flutter_luban/src/flutter_luban.dart:44:19)
E/flutter (26892): #2      List.forEach (dart:core-patch/growable_array.dart:416:8)
E/flutter (26892): #3      Luban._lubanCompressList (package:flutter_luban/src/flutter_luban.dart:43:13)
E/flutter (26892): #4      _IsolateConfiguration.applyAndTime.<anonymous closure>
package:flutter/…/foundation/_isolates_io.dart:107
E/flutter (26892): #5      Timeline.timeSync (dart:developer/timeline.dart:157:22)
E/flutter (26892): #6      _IsolateConfiguration.applyAndTime
package:flutter/…/foundation/_isolates_io.dart:105
E/flutter (26892): #7      _spawn
package:flutter/…/foundation/_isolates_io.dart:126

测试riot.im

如果图片文件是Uint8List，我应该如何设置？

Null safety

is there plan to migrate to null safety?

Please upgrade to Image: ^4.0.17

Please upgrade to flutter package Image: ^4.0.17

List<dynamic> is not a sub-type of type List<String>

static List<String?> _lubanCompressList(List objects) {
var results = [];
objects.forEach((_o) {
results.add(_lubanCompress(_o));
});
return results as List<String?>;
}

The above method was causing that error: Had to change to the below and resolved the error

static List<String?> _lubanCompressList(List objects) {
var results = [];
objects.forEach((_o) {
results.add(_lubanCompress(_o));
});
return (results as List<dynamic?>).cast<String?>();
}

压缩后图片质量下降不少呢，，