I am a beginner in Flutter development, I have an issue about filtering the size of pixels in image. I have a class that has a function to pick an image from gallery using file_picker, I want to filter the image that user can only upload the image that are 300×300 pixels. I have tried to modify my code, but when I try it, it seems still not working and the image more than 300×300 pixels is still can be uploaded by user. How can I fix this problem? Can anyone help me to find the solution of this problem?

Hello everyone i am a beginner in flutter development, i have an issue about filtering the size of pixels in image, i have a class that has a function to pick an image from gallery using file_picker, i want to filter the image that user can only upload the image that are 300×300 pixels, i have tried to modify my code but when i try it, it seems still not working and the image more than 300×300 pixels is still can be uploaded by user, how can i fix this problem, can anyone help me to find the solution of this problem ?