Photo Editor | Android Studio | Kotlin

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Image Editor | Android Studio | Kotlin

Android allows us to apply many kinds of effects on images. In this tutorial, we will apply some effects to an Image in the ImageView. We will apply the following effects to the image.
  1. Gray
  2. Bright
  3. Dark
  4. Red/Gama
  5. Green
  6. Blue

Step 1: Create a new project OR Open your existing project

Step 2: Place image in the drawable folder

Place any image (to apply the effects to it) in the drawable folder.
Photo Editor | Android Studio | Kotlin


Step 3: Code

activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="10dp"
    tools:context=".MainActivity">

    <TextView
        android:id="@+id/label1Tv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:text="Image Effects"
        android:textColor="#000"
        android:textSize="30sp" />

    <TextView
        android:id="@+id/label2Tv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/label1Tv"
        android:layout_centerHorizontal="true"
        android:text="Devofandroid.blogspot.com"
        android:textColor="@color/colorPrimaryDark"
        android:textSize="30sp" />

    <ImageView
        android:id="@+id/bannerIv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_centerVertical="true"
        android:adjustViewBounds="true"
        android:src="@drawable/sample_image" />

    <Button
        android:id="@+id/resetBtn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_above="@id/brightBtn"
        android:layout_centerHorizontal="true"
        android:onClick="resetClicked"
        android:text="Reset" />

    <Button
        android:id="@+id/grayBtn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_above="@id/redBtn"
        android:layout_alignParentStart="true"
        android:layout_alignParentLeft="true"
        android:onClick="grayClicked"
        android:text="Gray" />

    <Button
        android:id="@+id/brightBtn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_above="@id/greenBtn"
        android:layout_centerHorizontal="true"
        android:onClick="brightClicked"
        android:text="Bright" />

    <Button
        android:id="@+id/darkBtn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_above="@id/blueBtn"
        android:layout_alignParentEnd="true"
        android:layout_alignParentRight="true"
        android:onClick="darkClicked"
        android:text="Dark" />

    <Button
        android:id="@+id/redBtn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentStart="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentBottom="true"
        android:onClick="gamaClicked"
        android:text="Red" />

    <Button
        android:id="@+id/greenBtn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignStart="@+id/brightBtn"
        android:layout_alignLeft="@+id/brightBtn"
        android:layout_alignTop="@+id/redBtn"
        android:layout_alignParentBottom="true"
        android:onClick="greenClicked"
        android:text="Green" />

    <Button
        android:id="@+id/blueBtn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentEnd="true"
        android:layout_alignParentRight="true"
        android:layout_alignParentBottom="true"
        android:onClick="blueClicked"
        android:text="Blue" />

</RelativeLayout>

MainActivity.kt
package com.blogspot.atifsoftwares.imageeffects

import android.graphics.Bitmap
import android.graphics.Color
import android.graphics.drawable.BitmapDrawable
import android.os.Bundle
import android.view.View
import android.widget.ImageView
import androidx.appcompat.app.AppCompatActivity
import kotlinx.android.synthetic.main.activity_main.*

class MainActivity : AppCompatActivity() {
    private lateinit var bitmapOriginal: Bitmap
    private lateinit var bitmapConverted: Bitmap

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        val bitmapDrawable = bannerIv?.drawable as BitmapDrawable
        bitmapOriginal = bitmapDrawable.bitmap

    }

    fun resetClicked(view: View?) {
        bannerIv!!.setImageBitmap(bitmapOriginal)
    }

    fun grayClicked(view: View?) {
        bitmapConverted = Bitmap.createBitmap(bitmapOriginal.width, bitmapOriginal.height, bitmapOriginal.config)
        val red = 0.33
        val green = 0.59
        val blue = 0.11
        for (i in 0 until bitmapOriginal.width) {
            for (j in 0 until bitmapOriginal.height) {
                val p = bitmapOriginal.getPixel(i, j)
                var r = Color.red(p)
                var g = Color.green(p)
                var b = Color.blue(p)
                r = red.toInt() * r
                g = green.toInt() * g
                b = blue.toInt() * b
                bitmapConverted.setPixel(i, j, Color.argb(Color.alpha(p), r, g, b))
            }
        }
        bannerIv!!.setImageBitmap(bitmapConverted)
    }

    fun brightClicked(view: View?) {
        bitmapConverted = Bitmap.createBitmap(bitmapOriginal.width, bitmapOriginal.height, bitmapOriginal.config)
        for (i in 0 until bitmapOriginal.width) {
            for (j in 0 until bitmapOriginal.height) {
                val p = bitmapOriginal.getPixel(i, j)
                var r = Color.red(p)
                var g = Color.green(p)
                var b = Color.blue(p)
                var alpha = Color.alpha(p)
                r = 100 + r
                g = 100 + g
                b = 100 + b
                alpha = 100 + alpha
                bitmapConverted.setPixel(i, j, Color.argb(alpha, r, g, b))
            }
        }
        bannerIv!!.setImageBitmap(bitmapConverted)
    }

    fun darkClicked(view: View?) {
        bitmapConverted = Bitmap.createBitmap(bitmapOriginal.width, bitmapOriginal.height, bitmapOriginal.config)
        for (i in 0 until bitmapOriginal.width) {
            for (j in 0 until bitmapOriginal.height) {
                val p = bitmapOriginal.getPixel(i, j)
                var r = Color.red(p)
                var g = Color.green(p)
                var b = Color.blue(p)
                var alpha = Color.alpha(p)
                r = r - 50
                g = g - 50
                b = b - 50
                alpha = alpha - 50
                bitmapConverted.setPixel(i, j, Color.argb(Color.alpha(p), r, g, b))
            }
        }
        bannerIv!!.setImageBitmap(bitmapConverted)
    }

    fun gamaClicked(view: View?) {
        bitmapConverted = Bitmap.createBitmap(bitmapOriginal.width, bitmapOriginal.height, bitmapOriginal.config)
        for (i in 0 until bitmapOriginal.width) {
            for (j in 0 until bitmapOriginal.height) {
                val p = bitmapOriginal.getPixel(i, j)
                var r = Color.red(p)
                var g = Color.green(p)
                var b = Color.blue(p)
                var alpha = Color.alpha(p)
                r = r + 150
                g = 0
                b = 0
                alpha = 0
                bitmapConverted.setPixel(i, j, Color.argb(Color.alpha(p), r, g, b))
            }
        }
        bannerIv!!.setImageBitmap(bitmapConverted)
    }

    fun greenClicked(view: View?) {
        bitmapConverted = Bitmap.createBitmap(bitmapOriginal.width, bitmapOriginal.height, bitmapOriginal.config)
        for (i in 0 until bitmapOriginal.width) {
            for (j in 0 until bitmapOriginal.height) {
                val p = bitmapOriginal.getPixel(i, j)
                var r = Color.red(p)
                var g = Color.green(p)
                var b = Color.blue(p)
                var alpha = Color.alpha(p)
                r = 0
                g = g + 150
                b = 0
                alpha = 0
                bitmapConverted.setPixel(i, j, Color.argb(Color.alpha(p), r, g, b))
            }
        }
        bannerIv!!.setImageBitmap(bitmapConverted)
    }

    fun blueClicked(view: View?) {
        bitmapConverted = Bitmap.createBitmap(bitmapOriginal.width, bitmapOriginal.height, bitmapOriginal.config)
        for (i in 0 until bitmapOriginal.width) {
            for (j in 0 until bitmapOriginal.height) {
                val p = bitmapOriginal.getPixel(i, j)
                var r = Color.red(p)
                var g = Color.green(p)
                var b = Color.blue(p)
                var alpha = Color.alpha(p)
                r = 0
                g = 0
                b = b + 150
                alpha = 0
                bitmapConverted.setPixel(i, j, Color.argb(Color.alpha(p), r, g, b))
            }
        }
        bannerIv!!.setImageBitmap(bitmapConverted)
    }
}

Step 4: Run Project
Output
Photo Editor | Android Studio | KotlinPhoto Editor | Android Studio | KotlinPhoto Editor | Android Studio | KotlinPhoto Editor | Android Studio | KotlinPhoto Editor | Android Studio | KotlinPhoto Editor | Android Studio | KotlinPhoto Editor | Android Studio | Kotlin

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