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Description:

photofilters

Photo Filters package for flutter #
A flutter package for iOS and Android for applying filter to an image. A set of preset filters are also available. You can create your own filters too.
Installation #
First, add photofilters and image as a dependency in your pubspec.yaml file.
iOS #
No configuration required - the plugin should work out of the box.
Android #
No configuration required - the plugin should work out of the box.
Example #
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),
),
);
}
}
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UI Screen Shots #

Sample Images of Filters #

No Filter
AddictiveBlue
AddictiveRed
Aden

Amaro
Ashby
Brannan
Brooklyn

Charmes
Clarendon
Crema
Dogpatch

Earlybird
1977
Gingham
Ginza

Hefe
Helena
Hudson
Inkwell

Juno
Kelvin
Lark
Lo-Fi

Ludwig
Maven
Mayfair
Moon

Nashville
Perpetua
Reyes
Rise

Sierra
Skyline
Slumber
Stinson

Sutro
Toaster
Valencia
Vesper

Walden
Willow
X-Pro II

Sample Images of Convolution Filters #

Identity
Emboss
Sharpen
Colored Edge Detection

Blur
Edge Detection Medium
Edge Detection Hard
Guassian Blur

Low Pass
High Pass
Mean

Filters #
There are two types of filters. ImageFilter and ColorFilter.
Image Filter #
Image filter applies its subfilters directly to the whole image one by one. It is computationally expensive since the complexity & time increases as the number of subfilters increases.
You can create your own custom image filter as like this:
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));
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You can also inherit the ImageFilter class to create another image filter.

class MyImageFilter extends ImageFilter {
MyImageFilter(): super(name: "My Custom Image Filter") {
this.addSubFilter(ConvolutionSubFilter.fromKernel(sharpenKernel));
}
}
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Color Filter #
Color filter applies its subfilters to each pixel one by one. It is computationally less expensive than the ImageFilter. It will loop through the image pixels only once irrespective of the number of subfilters.
You can create your own custom color filter as like this:
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)]);

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You can inherit the ColorFilter class too

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

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Sub filters #
There are two types of subfilters. One can be added to the ColorFilter and the other can be added to the ImageFilter. You can inherit ColorSubFilter class to implement the former and you can use the ImageSubFilter mixin to implement the latter. You can create a same subfilter that can be used for both Image and Color Filters. The BrightnessSubFilter is an example of this.
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);
}
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Getting Started #
For help getting started with Flutter, view our online documentation.
For help on editing package code, view the documentation.