Obsolete for compatibility reason; Change costume encoding, PNG > WEBP

Feature Requests Snap! Feature Requests
1

Caution: a very large project, may cause trouble to your browser.

Snap uses "image/png" as the default format for storing images in the project. The new Web format, "webp" has a much better compression ratio and acceptable compatibility. This change should be fully transparent for users.

Edit: The compatibility table makes this proposal obsolete, as it does not work in Safari. As a loose compression, "image/jpeg" has much better compatibility.

Summary

To get some estimation, I created a project with ~70 large costumes from an image hosting site. The nominal project size is ~16MB and cannot be saved to the cloud. But I instructed Snap! to store costumes as "image/webp". The project size is now 2.6MB and can be saved to the cloud or exported.

2

But did you make sure the compression was lossless?

Webp is a great format, as it can store lossless images better than png, but it can also store lossy images.

3

I agree with this, especially when it comes to working on and saving a really big project.

4

I thought WebP lossless file sizes averaged about 75% of PNG

Are those project special images that compress to WebP much better than PNG?

5

Good point.
I should calc the hash to verify.

Random rather big and detailed images.
Maybe lossy compression is applied by default.

6

My idea is that Snap! should use GZIP to compress the media into way smaller sizes. That way, both images and sounds are smaller without having to change any file formats? :slight_smile:

7

Dedicated encoding/compression schemes do a much better job for their intended purpose, i.e., PNG/WEBP/JPG for images, PCM/Vorbis for sounds, than the generic ones (GZIP).

8

My bad. Files were compressed with the default 0.92 quality.
For q = 1, the project size is 11 MB

WEBP lossless rant

I'm still not fully confident if that (q=1) makes lossless webp.
But "image/webp.ll" does not work for me as intended
Issue 1302423004: Support lossy and lossless <canvas>.toDataURL for webp - Code Review

9

This topic was automatically closed 30 days after the last reply. New replies are no longer allowed.