Question 1

How do I save a transformed image as a JPEG with Flutter Bitmap?

Accepted Answer

Flutter Bitmap does not handle format encoding; it outputs bitmaps in RGBA32 format. To save as JPEG, you need to use another library like the `image` package to encode the bitmap data after transformation, as mentioned in the README.

Question 2

Is Flutter Bitmap faster than the image package for Flutter apps?

Accepted Answer

Yes, for Flutter-specific use cases, Flutter Bitmap is optimized to avoid redundant conversions by leveraging Flutter's native decoding and Dart FFI, making it generally faster for basic transformations like contrast and brightness, as explained in the 'Why this exists?' section.

Question 3

Can I apply multiple filters at once in Flutter Bitmap?

Accepted Answer

Yes, you can use the `applyBatch` method to apply multiple transformations such as brightness, saturation, and exposure in a single call, which is more efficient than applying them separately, as shown in the basic usage examples.

Question 4

How to use isolates to improve performance with Flutter Bitmap?

Accepted Answer

Offload bitmap operations to isolates by using Flutter's `compute` function; the package is designed to work with isolates, allowing heavy computations to run in the background without blocking the UI thread, as detailed in the performance section.

Question 5

Does Flutter Bitmap support transparency in images?

Accepted Answer

Yes, since it uses the RGBA32 format which includes an alpha channel, Flutter Bitmap fully supports transparency in bitmaps, enabling operations on images with transparent backgrounds without additional setup.

Question 6

What image formats can Flutter Bitmap read?

Accepted Answer

Flutter Bitmap can create bitmaps from any Flutter ImageProvider, such as NetworkImage or AssetImage, which handle various formats. However, it internally works only with RGBA32 bitmaps, relying on Flutter for initial decoding from sources like JPEG or PNG.

Bitmap

What is Bitmap?

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Frequently Asked Questions