CODEWITHSUNDEEP
iosswiftuiimage
drsealks
drsealks

Reputation: 2354

UIImagePNGRepresentation and hex representation of an image

suppose, I've got a png image A.png.

Then I add this image to asset catalog in my app, use it at scale 1.

Now, I write the following code:

    let im = UIImage(named: "TestByteSet")
    let data = UIImagePNGRepresentation(im!)
    print("\(data)")

Meanwhile, I open the original file A.png in a hex-viewer.

The question is: am I supposed to see the same data?

I can see that the beginning is clearly the same, which is not surprising: png specification tells we have to have png signature at the beginning of the file. However, after some number of bytes data is different.

What am I missing?

Thanks in advance.

Upvotes: 0

Views: 75

Answers (1)

user3441734
user3441734

Reputation: 17572

PNG file can vary significantly depending on how it is encoded and compressed, so what you see is quite normal

Upvotes: 1

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