flutter_image_filters 0.0.1

flutter_image_filters: ^0.0.1 copied to clipboard

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] [Luminance] [Monochrome] [Opacity] [Pixelation] [Posterize] [RGB] [Saturation] [Solarize] [Swirl] [Vibrance] [Vignette] [White Balance] [Zoom Blur]

Examples #

• Big Flutter Filters Demo - big example of how to use filters and.

Maintainers #

• Nikolay Dymura
• Egor Terekhov