Use BitmapFactory.Options with inPreferredConfig set to Bitmap.Config.ALPHA_8.
Mastering Bitmap Loading on Android: Forcing Images to be Loaded as ALPHA_8 with BitmapFactory
In modern mobile app development, images are an integral part of user interfaces. Android apps also use images extensively for various purposes like icons, logos, and background images.
ImageDecoder: The Secret to Forcing Alpha_8 Bitmap Loading on Android
ImageDecoder is an Android API that allows developers to efficiently decode images into a bitmap format. It was introduced in Android 8.0 (API level 26) and has since become the recommended way of loading images on Android. ImageDecoder supports a wide range of bitmap formats, including JPEG, PNG, WebP, BMP, and GIF. However, there is one particular format that developers often struggle with: Alpha_8.
Step-by-Step Guide: How to Force an Image to be Loaded as ALPHA_8 Bitmap on Android with BitmapFactory or ImageDecoder
When working on Android, sometimes you may need to load an image as an ALPHA_8 Bitmap. This can be useful when working with alpha masks or image processing.