Saved Image Colors are Inverted.

[izumeee]

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Descrpition

When I used the scroll_screenshot package's captureAndSaveScreenshot method to capture a screenshot and obtained the base64String, I executed the following code:
Gal.putImageBytes(base64Decode(base64String));
However, the image colors appeared inverted, as if in dark mode. This behavior was observed on both iOS and Android.
Additionally, I tried using the image_gallery_saver package to process the same base64String with the following code, but the color inversion did not occur:
ImageGallerySaver.saveImage(base64Decode(base64String));
This was confirmed on iOS (Android has not been tested due to build errors).

When viewing the image saved with putImageBytes in the iOS "Photos" app or Android "Files" app, the thumbnail displays the correct colors, but when viewing the full image, the colors appear inverted.

• This issue occurs with both .jpg and .png formats.
• It is reproducible whether dark mode is enabled or disabled on the device.
• The issue was reproduced on Android 13, 14, iOS 17.5, and 18.0.
• It occurs on both real devices and simulators.
• I also confirmed that the issue occurs with the following code:
  final tempDir = await getTemporaryDirectory();
Gal.putImage(tempDir.path);
  I have attached the base64 text file that was passed as an argument, as well as the saved image files for reference.
  base64String_2024-10-24_11-08_21335.txt