About the differences after comparing two images mse values ​​in avif and png formats with ImageLoader.Builder and ImageRequest.Builder

[sinabirdevrim]

Hello,

I'm using Coil 3 with ImageLoader.Builder and ImageRequest.Builder to obtain the bitmap values of two identical images in different formats—one in AVIF and the other in PNG. I then calculate the MSE (Mean Squared Error) differences between them.

I noticed that the calculation results are the same on Samsung S21 Ultra and S22 Ultra but different on the S23. When I specify a fixed size, the problem seems to be resolved, but I still see inconsistencies on some devices.

I'm curious why device-specific bitmap variations occur even when I provide a fixed size or not, and how I can resolve this issue.

`
ImageRequest.Builder(context)
.bitmapConfig(Bitmap.Config.ARGB_8888)
.size(500)
.memoryCachePolicy(CachePolicy.DISABLED)
.diskCachePolicy(CachePolicy.DISABLED)

`

Thank you.

[colinrtwhite]

Android's graphics algorithms can (and do) change between API levels and devices. Unfortunately I don't think it's possible to get 100% consistency.

[sinabirdevrim]

Thank you for your response! 😊 How is it related to size? When I don't specify a size, there is a difference between the S21 and S23 Ultra, but with a fixed size, they appear the same. Also, I'm using ImageRequest and ImageLoader only for bitmap conversion without attaching them to any UI components. Thank you!