Docker image size changed on aws ecr

Question

i just uploaded docker image to aws ecr. my actual docker image locally is 927 MB while on ECR it is showing 321 MB

is there anything i am missing to read during documentation ?

i have uploaded image is proper with tag name but size change is there

Answer 1

This is due to how docker client acts before it pushes the image to ECR, So the size on the ECR dashboard is a size for a compressed version of your image as documented:

Beginning with Docker version 1.9, the Docker client compresses image layers before pushing them to a V2 Docker registry. The output of the docker images command shows the uncompressed image size, so it may return a larger image size than the image sizes shown in the AWS Management Console.