flutter_image_filters 0.0.2

A flutter package for iOS and Android for applying OpenGL filters to image.

Usage #

Export processed image #

final texture = await TextureSource.fromAsset('demo.jpeg');
final configuration = BrightnessShaderConfiguration();
configuration.brightness = 0.5;
final image = await configuration.export(texture, texture.size);

LookupTable sample #

LUT

final texture = await TextureSource.fromAsset('demo.jpeg');
final configuration = LookupTableShaderConfiguration();
configuration.size = 8;
configuration.rows = 8;
configuration.columns = 8;
await configuration.setLutAsset('lookup_amatorka.png');
final image = await configuration.export(texture, texture.size);

LookupTable HALD sample #

LUT

final texture = await TextureSource.fromAsset('demo.jpeg');
final configuration = LookupTableShaderConfiguration();
configuration.size = 8;
configuration.rows = 64;
configuration.columns = 8;
await configuration.setLutAsset('lookup_hald.png');
final image = await configuration.export(texture, texture.size);

ImageShaderPreview example #

import 'package:flutter_image_filters/flutter_image_filters.dart';

class PreviewPage extends StatefulWidget {
  const PreviewPage({Key? key}) : super(key: key);

  @override
  State<PreviewPage> createState() => _PreviewPageState();
}

class _PreviewPageState extends State<PreviewPage> {
  late TextureSource texture;
  late BrightnessShaderConfiguration configuration;
  bool textureLoaded = false;

  @override
  void initState() {
    super.initState();
    configuration = BrightnessShaderConfiguration();
    configuration.brightness = 0.5;
    TextureSource.fromAsset('demo.jpeg')
        .then((value) => texture = value)
        .whenComplete(
          () => setState(() {
            textureLoaded = true;
          }),
        );
  }

  @override
  Widget build(BuildContext context) {
    return textureLoaded
        ? ImageShaderPreview(
            texture: texture,
            configuration: configuration,
          )
        : const Offstage();
  }
}

Divided preview sample #

import 'package:before_after_image_slider_nullsafty/before_after_image_slider_nullsafty.dart';
import 'package:flutter_image_filters/flutter_image_filters.dart';

class PreviewPage extends StatefulWidget {
  const PreviewPage({Key? key}) : super(key: key);

  @override
  State<PreviewPage> createState() => _PreviewPageState();
}

class _PreviewPageState extends State<PreviewPage> {
  late TextureSource texture;
  late BrightnessShaderConfiguration configuration;
  bool textureLoaded = false;

  @override
  void initState() {
    super.initState();
    configuration = BrightnessShaderConfiguration();
    configuration.brightness = 0.5;
    TextureSource.fromAsset('demo.jpeg')
        .then((value) => texture = value)
        .whenComplete(
          () => setState(() {
            textureLoaded = true;
          }),
        );
  }

  @override
  Widget build(BuildContext context) {
    return textureLoaded
        ? BeforeAfter(
            thumbRadius: 0.0,
            thumbColor: Colors.transparent,
            beforeImage: ImageShaderPreview(
              texture: texture,
              configuration: NoneShaderConfiguration(),
            ),
            afterImage: ImageShaderPreview(
              texture: texture,
              configuration: configuration,
            ),
          )
        : const Offstage();
  }
}

Export & save processed image #

import 'package:image/image.dart' as img;
import 'package:path_provider/path_provider.dart';



final texture = await TextureSource.fromAsset('demo.jpeg');
final configuration = BrightnessShaderConfiguration();
configuration.brightness = 0.5;
final image = await configuration.export(texture, texture.size);

final directory = await getTemporaryDirectory();
final output =
File('${directory.path}/result.jpeg');
final bytes = await image.toByteData();
final persistedImage = img.Image.fromBytes(
  image.width,
  image.height,
  bytes!.buffer.asUint8List(),
);
img.JpegEncoder encoder = img.JpegEncoder();
final data = encoder.encodeImage(persistedImage);
await output.writeAsBytes(data);

Additional information #

Support status of GPUImage for iOS and GPUImage for Android shaders #

✅ Brightness
✅ Bulge Distortion
✅ CGA Colorspace
✅ Color Invert
✅ Color Matrix
✅ Contrast
✅ Crosshatch
✅ Exposure
✅ False Color
✅ Gamma
✅ Grayscale
✅ Halftone
✅ Highlight Shadow
✅ Hue
✅ Lookup Table
✅ Luminance
✅ Luminance Threshold
✅ Monochrome
✅ Opacity
✅ Pixelation
✅ Posterize
✅ RGB
✅ Saturation
✅ Solarize
✅ Swirl
✅ Vibrance
✅ Vignette
✅ White Balance
✅ Zoom Blur

Sample results #

Brightness Bulge Distortion CGA Colorspace Color Invert Color Matrix Contrast Crosshatch Exposure False Color Gamma Grayscale Halftone Highlight Shadow Hue Lookup Table Luminance Threshold Monochrome Opacity Pixelation Posterize RGB Saturation Solarize Swirl Vibrance Vignette White Balance Zoom Blur