Android ColorMatrix 圖片濾鏡 色調&飽和度&亮度

文章目錄

1. 設定三個SeekBar的預設值和最大值並監聽
2. SeekBar監聽事件
3. 創建新圖片並儲存
4. 效果展示
5. Github

---

1.設定三個SeekBar的預設值和最大值並監聽

const val MID_VALUE = 128
private lateinit var seekBarRotate: SeekBar
private lateinit var seekBarSaturation: SeekBar
private lateinit var seekBarScale: SeekBar

//色調SeekBar
seekBarRotate = findViewById(R.id.seekBar_rotate)
seekBarRotate.max = 255
seekBarRotate.progress = MID_VALUE

//飽和度SeekBar
seekBarSaturation = findViewById(R.id.seekBar_saturation)
seekBarSaturation.max = 255
seekBarSaturation.progress = MID_VALUE

//亮度SeekBar
seekBarScale = findViewById(R.id.seekBar_scale)
seekBarScale.max = 255
seekBarScale.progress = MID_VALUE

//SeekBar監聽
seekBarRotate.setOnSeekBarChangeListener(this)
seekBarSaturation.setOnSeekBarChangeListener(this)
seekBarScale.setOnSeekBarChangeListener(this)

2.SeekBar監聽事件

//色調
private val rotateMatrix = ColorMatrix()
//飽和度
private val saturationMatrix = ColorMatrix()
//亮度
private val scaleMatrix = ColorMatrix()
//三合一
private val colorMatrix = ColorMatrix()

override fun onProgressChanged(seekBar: SeekBar, progress: Int, fromUser: Boolean) {
    when (seekBar.id) {
        R.id.seekBar_rotate -> {
            val mHue = (progress - MID_VALUE).toFloat() / MID_VALUE * 180
            rotateMatrix.reset()
            rotateMatrix.setRotate(0, mHue)
            rotateMatrix.setRotate(1, mHue)
            rotateMatrix.setRotate(2, mHue)
        }
        R.id.seekBar_saturation -> {
            val mSaturation = progress / MID_VALUE.toFloat()
            saturationMatrix.reset()
            saturationMatrix.setSaturation(mSaturation)
        }
        R.id.seekBar_scale -> {
            val mBrightness = progress / MID_VALUE.toFloat()
            scaleMatrix.reset()
            scaleMatrix.setScale(mBrightness, mBrightness, mBrightness, 1f)
        }
    }

    colorMatrix.reset()
    colorMatrix.postConcat(rotateMatrix)
    colorMatrix.postConcat(saturationMatrix)
    colorMatrix.postConcat(scaleMatrix)
    oldImage.colorFilter = ColorMatrixColorFilter(colorMatrix)
}

override fun onStartTrackingTouch(seekBar: SeekBar?) {

}

override fun onStopTrackingTouch(seekBar: SeekBar?) {

}

3.創建新圖片並儲存

//原圖
private lateinit var bitmap: Bitmap
//新圖片
private lateinit var newImage: ImageView

fun saveBitmap(view: View) {
    bitmap = BitmapFactory.decodeResource(resources, R.drawable.girl)
    //新圖放到畫布上
    val newBitmap = Bitmap.createBitmap(bitmap.width, bitmap.height, Bitmap.Config.ARGB_8888)
    val canvas = Canvas(newBitmap)

    //設定畫筆參數(把剛剛設定的三合一參數給畫筆)
    val paint = Paint(Paint.ANTI_ALIAS_FLAG)
    paint.colorFilter = ColorMatrixColorFilter(colorMatrix)

    canvas.drawBitmap(bitmap, 0f, 0f, paint)

    val file = File(externalCacheDir, "matrixGirl.jpg")
    val ops = FileOutputStream(file)
    newBitmap.compress(Bitmap.CompressFormat.JPEG, 100, ops)

    newImage = findViewById(R.id.newImage)
    newImage.setImageBitmap(newBitmap)
}

4.效果展示

5.Github

ColorMatrixDemo