Zend certified PHP/Magento developer

are img files block aligned like actual filesystems

filesystems like ext4 are block aligned, files are aligned in 4k blocks typically. If an img file is created from such as filesystem, can I assume that the individual files in the filesystem is 4k aligned in the created img file? In other words, say we have two 1k file called foo and bar, they look like below

[foo][][][][bar][][][]

where [] is 1k. so foo and bar are 4k aligned. now we create a img file for this file system. are contents of foo and bar still 4k aligned from the start bit of the img file?