Android color from image

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Extract colors from image(bitmap) using Palette in Android

When open the profile page of any person or group in Whatsapp, you will find that the color of the toolbar at top uses the color from the DP of the user or group. It looks good when you use extracted colors from image in your layout. Your layout will blend with the image and other content.

So here we can extract different colors from any image(bitmap) used in our application and use those colors effectively in our app throughout.

Main Color Profiles

First of all there are main 6 type of color profiles in the image that we can extract.

• Vibrant
• Vibrant Dark
• Vibrant Light
• Muted
• Muted Dark
• Muted Light

Most used profile from above are Vibrant and Vibrant Dark. The reason is, vibrant colors are pure, bright, intense, saturated and high chroma color. They stand out in the image and easy to point out. Now if we use those colors in the layout along with the image, it will give a great look. Whatsapp is the best example of it as we discussed earlier.

Every profile(swatch) gives us following information that we can use in the application.

• population of that color in image
• hue, saturation, lightness
• body text color with sufficient contrast with the main color
• title text color with sufficient contrast with the main color

Now we look at the code to get the Palette from bitmap.

Here we get the Palette from image(bitmap). Now we extract main 6 different kind of color profile(swatch) from it.

Now we will extract 4 different values from these swatch as described earlier in the article. Here we will take psVibrant as an example.

You can also get other colors from image other than above 6 by following code snippet.

Other Color Profiles

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Android – Pick Colors from Image Color Palette

Color Pallete in android is useful for creating beautiful UI and maintain the same color throughout the app. With the release of Android Lollipop, several new support libraries have been created. One of the new libraries is for the Palette class. This new class makes it easy to extract colors from images, which is useful if you want to style other view components to match colors from your image, such as a background for the image or a text color with suitable contrast. One way I like to use this is to color the ripple drawable behind the image. It is a subtle effect, but I think it is a nice improvement over the standard gray.

Extracting colors from an image may sound a very code intensive and difficult thing to do. But believe me with Android palette library it is very simple to pick relevant colors from an image. Also this new library gives a lot of options to pick the right type of colors for your screen.

Step 1 ) Update build.gradle file

Before you can use it in your projects you need to add the following compile line to your Gradle dependencies block in your build.gradle file.

Step 2) Add wallpaper image in drawable folder .

Step 3) Update styles.xml .

Create style for TextView so that you does not need to write the properties again and again . simply use style property like style=”@style/textStyle” in TextView to use this style .

Step 4) Update strings.xml .

Step 5) Update dimens.xml .

Step 6) Create activity_main.xml .

In xml there is an ImageView to show image wallpaer.jpg and 6 TextView to set color picked via Palette from wallpaper.jpg .

Step 7) Create MainActivity.java

In This class we used palette class to pick color from Bitmap . Android Palette is a collection of swatches. Each Android Swatch represents a color. The Palette object will try to find 16 colors from the image by default, but there are six color profiles you will use most often:

Vibrant – use getVibrantColor(0) method to get vibrant color.
Vibrant dark – use getDarkVibrantColor(0) method to get vibrant dark color.
Vibrant light – use getLightVibrantColor(0) method to get vibrant light color.
Muted – use getMutedColor(0) method to get muted color.
Muted dark – use getDarkMutedColor(0) method to get muted dark color.
Muted light – use getLightMutedColor(0) method to get muted light color.

This whole sample would result a screen like this:

Enjoy Coding and Share Knowledge

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Android Palette – Pick colors from images

When Android 5.0 (Lollipop) version was released, support library v7 was also updated with a new library called Android Palette library. This new library can help you to pick colors from an image dynamically. For example if you are building an image intensive app, where user experience is of prime importance you can use this Android Palette library to extract colors from the image on screen. Further these colors could be used at prominent spaces on your screen to blend the image into your app screen. Now days a lot of effort is being spent on building a good user experience for android apps. This Palette library is something completely new which could revolutionize the user experience in Android apps.

Extracting colors from an image may sound a very code intensive and difficult thing to do. But believe me with Android palette library it is very simple to pick relevant colors from an image. Also this new library gives a lot of options to pick the right type of colors for your screen.

Android Palette Library Basics

As I mentioned it is very simple to use Android Palette library. But before jumping directly to an example lets understand the basics of this library first. Palette library is available through the support repository of Android, which makes this library ready to use for Android API 7 and above.

How to generate an Android Palette

Asynchronously

I believe this is the best way one can generate a palette in Android. As when generating a palette asynchronously you don’t need to wait until you have a palette with you. In case of asynchronous android palette generation, if a palette is generated it will replace the default colors on the screen. Which would be a good programming practice. Please keep in mind when generating a palette asynchronously or synchronously, there can be a situation where palette is returned as null . Therefore don’t forget to perform a null check. Have a look at the code snippet below to do so:

Synchronously

Although there might be a situation, where you may decide to write some custom piece of code where it is required to wait until a palette is generated. In such a case this synchronous Android palette generation technique could be used. Before having a look at the code snippet to do so, I would like to remind you that whether it is an asynchronous or synchronous palette generation, returned value could be null. Hence don’t forget to apply a null check:

Varieties of an Android Palette

As the name suggests Android Palette is a collection of swatches. Each Android Swatch represents a color. When an image is used to generate a palate we can optionally specify the number of swatches we want from that image. In case we don’t specify the number (like I have not been specifying in this example), 16 swatches would be returned. Although the most prominently used swatches are given a name:

• Vibrant – use Palette.getVibrantSwatch() method to get this swatch.
• Vibrant dark – use Palette.getDarkVibrantSwatch() method to get this swatch.
• Vibrant light – use Palette.getLightVibrantSwatch() method to get this swatch.
• Muted – use Palette.getMutedSwatch() method to get this swatch.
• Muted dark – use Palette.getDarkMutedSwatch() method to get this swatch.
• Muted light – use Palette.getLightMutedSwatch() method to get this swatch.

If you wish to retrieve all the swatches, you can do it by using this piece of code:

How to use a Swatch

As I mentioned a swatch represents a color and by default 16 swatches are generated. Some of the important methods of the Android Swatch class are:

• getRgb() – Returns the color in RGB value.
• getTitleTextColor() – Returns the title color in RGB value. A color in contrast with the swatch color, safe to use on top of swatch as title text color.
• getBodyTextColor() – Returns the body text color in RGB value. A color in contrast with the swatch color, safe to use on top of swatch as body text color.
• getPopulation() – Returns the quantity of pixels represented by this swatch.

Android Palette Library Example

Here I will show an example of Android Palette Library, where we will generate a palette asynchronously. To do so first include the palette library in the dependencies section of your build.gradle file:

Next lets make a layout where an image would be displayed, with title and body text:

Please Note: Replace the truiton_short image with your desired image to make this example work.

Further lets write the Main Activity where the colors would be picked from the specified image.

This whole sample would result a screen like this:

In the example above you can see that, I have generated an Android Palette asynchronously. When a palette is generated, the onGenerated method of PaletteAsyncListener is called, in which a null check is performed. If the palette is not null then the colors of screen are changed in accordance with the palette. Hope this helped. Connect with us on Facebook, Google+, and Twitter for more updates.

About Mohit Gupt

An android enthusiast, and an iPhone user with a keen interest in development of innovative applications.

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Dynamic Colors With Glide Library and Android Palette

May 14, 2018 · 3 min read

Recently, I was required to style Android views in different colors for each screen according to a dominant color chosen by an image in those particular screens. This might sound a little bit confusing, so I have made a sample project just to show you what I mean and how I did it.

In the sample app, we have a list of different m ovie posters on the first screen. From there, we can choose any movie poster and the second screen will display that movie poster with some information of the movie. Meanwhile, android views on the detail screen (second screen) will take on the dominant color of that movie poster. This means colors of android views of different poster have different colors.

Let’s get started! To make it simple, we will only focus on three android views: Status bar, Action bar and View. By combining Glide Library and Android Palette, we can make our app look more interesting. Below are screenshots from the sample app.

Glide supports fetching, decoding, and displaying video stills, images, and animated GIFs. Glide includes a flexible API that allows developers to plug in to almost any network stack. By default Glide uses a custom HttpUrlConnection based stack, but also includes utility libraries plug in to Google’s Volley project or Square’s OkHttp library instead.

Glide’s primary focus is on making scrolling any kind of a list of images as smooth and fast as possible, but Glide is also effective for almost any case where you need to fetch, resize, and display a remote image.

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Top 10: Best Android Color Picker Libraries

Carlos Delgado

See our review from 10 of the Best Android Color Picker Libraries.

A color tool, color picker, or color chooser in an application, is a utility that is usually but not necessarily found within graphics apps. They’re used to choose colors or create color schemes. Normally, they allow you to choose a color in its RGB-A, HEX, or HSL-A representation. If you are willing to implement such a feature in your Android Native application, you already know that there are a lot of libraries that allow you to implement this widget in case that you are working on software to colorize photos.

In this top, we’ll share with you 10 of the most imponent libraries to build color pickers in your native android application.

10. ColorSheet

ColorSheet is a color picker fragment from the bottom sheet.

9. Pikolo

Pikolo is an android color picker library. It works as a widget inside your application, so add the HSLColorPicker view to your layout and use it in code as below:

8. ColorPicker by Duanhong

This library allows you to display a ColorPicker for Android. Pick a color using color wheel and slider (HSV & alpha). It can be initialized like this:

7. hsv-alpha ColorPicker android

This library implements a color picker and a color preference for use in Android applications. This plugins features:

• Alpha slider.
• Text field to copy and paste hex color values.
• Old and new colors displayed side by side.
• Optional selection of «no color».
• Proper behavior when orientation changes.
• Up-to-date design.

In addition, the Hue-Saturation picker.

• gives higher hue precision than a square picker of the same size.
• allows easier selection of pure white than a circular picker.

6. AndroidPhotoshopColorPicker

This plugins allows you to implement a full featured Color picker Library for Android! Just like the one in Photoshop! It features:

• Hue bar — Adjust hue using a slider
• Saturation & Value Box — Select the color from the Saturation & Value Box (like in Photoshop)
• Alpha bar — Adjust the alpha using a slider
• Preview — You can see the current selected and previously picked colors side-by-side
• Edit each component individually — You can edit Hue, Saturation, Value, Red, Green and Blue components individually
• Fully customizable — By default, there are two themes(Light and Dark). But you can define your own theme to customize the whole ColorPicker
• Easy to use — All the hardwork is done by us. Just a few lines of code is all you have to do

5. Skydoves ColorPickerPreference

A library that lets you implement ColorPickerView, ColorPickerDialog, ColorPickerPreference. Could get HSV color, RGB values, Html color code from your gallery pictures or custom images just by touching.

4. Android Colorpicker Preference

ColorPickerPreference is a library for android to create color picker in preferences. This template features:

• Color Area
• Hue Slider
• Alpha Slider (disabled by default)
• Old & New Color
• Color Preview in Preferences List

3. Holopicker

Holopicker is an Android Holo themed colorpicker designed by Marie Schweiz. You can now set the Saturation and Value of a color. Also its possible to set the Opacity for a color. You can also set the last selected color and see the difference with the new selected color.

2. ColorPickerView

ColorPickerView is the most standard and powerful colorpicker library. ColorPickerView implements getting HSV colors, ARGB values, Hex color codes from any image drawables or your gallery pictures by tapping on the desired color. Supports alpha & brightness slider bar, dialog, and auto saving & restoring selected data. ColorPickerDialog can be used just like using AlertDialog and provides colors from any drawables. ColorPickerDialog extends AlertDialog . So we can customize themes also. A new dialog that allows you to pick a color can be initialized with the following code:

1. QuadFlask Colorpicker

The colorpicker library by QuadFlask is a pretty simple android color picker with color wheel and lightness bar. The library is not released in Maven Central, but instead you can use JitPack. It can be used easily as a dialog with the following code:

Honorable mentions

Colorpicker

Colorpicker is a simple Android color picker library.

If you know another open source color picker component for Android applications, please share it with the community in the comment box.

Carlos Delgado

Interested in programming since he was 14 years old, Carlos is a self-taught programmer and founder and author of most of the articles at Our Code World.

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