Photo Filters

https://pub.dev/packages/photofilters
Admin
Photo Filters is a Flutter package that applies various types of filters to images with preset...
Tokens:2,276
Snippets:22
Trust Score:9.9
Update:6 months ago
Show doc for...
Tokens:
Raw
### Flutter Image Filter Example

Source: https://pub.dev/packages/photofilters

This example demonstrates how to pick an image from the gallery and apply filters using the photofilters package. It requires the image_picker package for image selection.

```dart
import 'dart:async';
import 'dart:io';

import 'package:flutter/material.dart';
import 'package:path/path.dart';
import 'package:photofilters/photofilters.dart';
import 'package:image/image.dart' as imageLib;
import 'package:image_picker/image_picker.dart';

void main() => runApp(new MaterialApp(home: MyApp()));

class MyApp extends StatefulWidget {
  @override
  _MyAppState createState() => new _MyAppState();
}

class _MyAppState extends State<MyApp> {
  String fileName;
  List<Filter> filters = presetFiltersList;
  File imageFile;

  Future getImage(context) async {
    imageFile = await ImagePicker.pickImage(source: ImageSource.gallery);
    fileName = basename(imageFile.path);
    var image = imageLib.decodeImage(imageFile.readAsBytesSync());
    image = imageLib.copyResize(image, width: 600);
     Map imagefile = await Navigator.push(
      context,
      new MaterialPageRoute(
        builder: (context) => new PhotoFilterSelector(
              title: Text("Photo Filter Example"),
              image: image,
              filters: presetFiltersList,
              filename: fileName,
              loader: Center(child: CircularProgressIndicator()),
              fit: BoxFit.contain,
            ),
      ),
    );
    if (imagefile != null && imagefile.containsKey('image_filtered')) {
      setState(() {
        imageFile = imagefile['image_filtered'];
      });
      print(imageFile.path);
    }
  }

  @override
  Widget build(BuildContext context) {
    return new Scaffold(
      appBar: new AppBar(
        title: new Text('Photo Filter Example'),
      ),
      body: Center(
        child: new Container(
          child: imageFile == null
              ? Center(
                  child: new Text('No image selected.'),
                )
              : Image.file(imageFile),
        ),
      ),
      floatingActionButton: new FloatingActionButton(
        onPressed: () => getImage(context),
        tooltip: 'Pick Image',
        child: new Icon(Icons.add_a_photo),
      ),
    );
  }
}

```

--------------------------------

### Image Filtering with Photofilters

Source: https://pub.dev/packages/photofilters/example

This example demonstrates how to pick an image from the gallery, apply a filter using PhotoFilterSelector, and display the filtered image. It requires importing necessary packages and setting up a Flutter widget.

```dart
import 'dart:async';
import 'dart:io';

import 'package:flutter/material.dart';
import 'package:path/path.dart';
import 'package:photofilters/photofilters.dart';
import 'package:image/image.dart' as imageLib;
import 'package:image_picker/image_picker.dart';

void main() => runApp(new MaterialApp(home: MyApp()));

class MyApp extends StatefulWidget {
  @override
  _MyAppState createState() => new _MyAppState();
}

class _MyAppState extends State<MyApp> {
  String fileName;
  List<Filter> filters = presetFiltersList;
  final picker = ImagePicker();
  File imageFile;

  Future getImage(context) async {
    final pickedFile = await picker.getImage(source: ImageSource.gallery);
    if(pickedFile!=null){
    imageFile = new File(pickedFile.path);
    fileName = basename(imageFile.path);
    var image = imageLib.decodeImage(await imageFile.readAsBytes());
    image = imageLib.copyResize(image, width: 600);
    Map imagefile = await Navigator.push(
      context,
      new MaterialPageRoute(
        builder: (context) => new PhotoFilterSelector(
          title: Text("Photo Filter Example"),
          image: image,
          filters: presetFiltersList,
          filename: fileName,
          loader: Center(child: CircularProgressIndicator()),
          fit: BoxFit.contain,
        ),
      ),
    );
    
    if (imagefile != null && imagefile.containsKey('image_filtered')) {
      setState(() {
        imageFile = imagefile['image_filtered'];
      });
      print(imageFile.path);
    }
    }
  }

  @override
  Widget build(BuildContext context) {
    return new Scaffold(
      appBar: new AppBar(
        title: new Text('Photo Filter Example'),
      ),
      body: Center(
        child: new Container(
          child: imageFile == null
              ? Center(
                  child: new Text('No image selected.'),
                )
              : Image.file(new File(imageFile.path)),
        ),
      ),
      floatingActionButton: new FloatingActionButton(
        onPressed: () => getImage(context),
        tooltip: 'Pick Image',
        child: new Icon(Icons.add_a_photo),
      ),
    );
  }
}

```

--------------------------------

### Implement Brightness Subfilter

Source: https://pub.dev/packages/photofilters

Provides an example of a BrightnessSubFilter that can be used for both ColorFilters and ImageFilters. It requires implementing methods for applying brightness to pixels and RGBA colors.

```dart
class BrightnessSubFilter extends ColorSubFilter with ImageSubFilter {
  final num brightness;
  BrightnessSubFilter(this.brightness);

  ///Apply the [BrightnessSubFilter] to an Image.
  @override
  void apply(Uint8List pixels, int width, int height) =>
      image_filter_utils.brightness(pixels, brightness);

  ///Apply the [BrightnessSubFilter] to a color.
  @override
  RGBA applyFilter(RGBA color) =>
      color_filter_utils.brightness(color, brightness);
}

```

--------------------------------

### Static Analysis Error: Missing Block

Source: https://pub.dev/packages/photofilters/score

Example of a static analysis finding where an if statement lacks a block.

```dart
   ╷
44 │               return Center(child: Text('Error: ${snapshot.error}'));
   │               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   ╵
```

--------------------------------

### Static Analysis Error: Missing Type Annotation

Source: https://pub.dev/packages/photofilters/score

Example of a static analysis finding regarding a missing type annotation.

```dart
    ╷
186 │   _buildFilterThumbnail(
    │   ^^^^^^^^^^^^^^^^^^^^^
    ╵
```

--------------------------------

### Inherit ImageFilter to Create Custom Filter

Source: https://pub.dev/packages/photofilters

This example demonstrates creating a custom image filter by extending the ImageFilter class and adding a ConvolutionSubFilter. This approach allows for more structured custom filter definitions.

```dart

class MyImageFilter extends ImageFilter {
  MyImageFilter(): super(name: "My Custom Image Filter") {
    this.addSubFilter(ConvolutionSubFilter.fromKernel(sharpenKernel));
  }
}


```

--------------------------------

### Add photofilters dependency

Source: https://pub.dev/packages/photofilters/install

Use the command line to add the package to your Flutter project.

```bash
$ flutter pub add photofilters
```

--------------------------------

### Create a Custom Color Filter

Source: https://pub.dev/packages/photofilters

Demonstrates how to create a custom ColorFilter by instantiating it and adding subfilters. Use this to build complex color transformations.

```dart
    import 'package:photofilters/filters/color_filters.dart';

    var customColorFilter = new ColorFilter(name: "Custom Color Filter");
    customColorFilter.addSubFilter(SaturationSubFilter(0.5));
    customColorFilter
        .addSubFilters([BrightnessSubFilter(0.5), HueRotationSubFilter(30)]);

```

--------------------------------

### Configure pubspec.yaml

Source: https://pub.dev/packages/photofilters/install

Manually add the dependency to your project's pubspec.yaml file.

```yaml
dependencies:
  photofilters: ^3.0.1
```

--------------------------------

### Import photofilters library

Source: https://pub.dev/packages/photofilters/install

Include the package in your Dart files to access its functionality.

```dart
import 'package:photofilters/photofilters.dart';
```

--------------------------------

### Inherit ColorFilter Class

Source: https://pub.dev/packages/photofilters

Shows how to create a custom color filter by extending the ColorFilter class and defining subfilters in the constructor. This is useful for reusable filter configurations.

```dart
class MyColorFilter extends ColorFilter {
  MyColorFilter() : super(name: "My Custom Color Filter") {
    this.addSubFilter(BrightnessSubFilter(0.8));
    this.addSubFilter(HueRotationSubFilter(30));
  }
}

```

--------------------------------

### Create Custom Image Filter with Convolution Kernels

Source: https://pub.dev/packages/photofilters

This snippet shows how to create a custom image filter by adding multiple ConvolutionSubFilters with predefined kernels and a SaturationSubFilter. Ensure the necessary kernel definitions are available.

```dart
    import 'package:photofilters/filters/image_filters.dart';

    var customImageFilter = new ImageFilter(name: "Custom Image Filter");
    customImageFilter.subFilters.add(ConvolutionSubFilter.fromKernel(
      coloredEdgeDetectionKernel,
    ));
    customImageFilter.subFilters.add(ConvolutionSubFilter.fromKernel(
      gaussian7x7Kernel,
    ));
    customImageFilter.subFilters.add(ConvolutionSubFilter.fromKernel(
      sharpenKernel,
    ));
    customImageFilter.subFilters.add(ConvolutionSubFilter.fromKernel(
      highPass3x3Kernel,
    ));
    customImageFilter.subFilters.add(ConvolutionSubFilter.fromKernel(
      lowPass3x3Kernel,
    ));
    customImageFilter.subFilters.add(SaturationSubFilter(0.5));

```
Tokens:
Raw