Trigrad
Languages and libraries
image compression
SHOW HN2015
How HN took it
6 positive, 26 neutral or asking, 0 mixed, 8 critical, out of 40 comments about the project. Thread score -0.04.
Performance: 0 for, 5 againstExecution: 3 for, 2 againstIdea: 2 for, 1 against
The thread, comment by comment
Each row is a top-level comment and its replies, in HN's order. Select a cell to open that comment on HN.
positive neutral or mixed critical about another commenter or something else the maker
What HN said
What people liked
Interesting, working image compression idea that gradients handle well
From 3 comments
This is the difference between someone who actually does something and academic work that claims to achieve something. This is half-done, but it WORKS and you can use it and…
kobigurk on HNIt's not very comparable to PNG, since they're designed for different types of imagery. I know currently Trigrad cannot handle text at all. In regards to your other comment, it's…
ruarai on HNLove how the algorithm is simple compared to iDCT based ones, very good job! > No text at all Or indeed anything which poorly maps to gradients. For this I'm thinking about…
ezdiy on HN
Objections
Compares poorly to JPEG and PNG on photos and text
From 2 comments
PNG is lossless, so I don't get the quality comparison. I don't think this approach can compete with JPEG and newer transform based variants for natural photos (event at edge…
darkmighty on HNIt's not very comparable to PNG, since they're designed for different types of imagery. I know currently Trigrad cannot handle text at all. In regards to your other comment, it's…
ruarai on HN
No comparison against existing state-of-the-art methods
From 2 comments
I agree that it's nice to have this kind of write up and code, but "works" is a low bar to pass, especially in image compression. If this were written up as an academic paper, a…
cafebeen on HNI mean the author no harm, nor want to talk bad about his work. His work is very cool and I like the amount of information that he gives. Yet, this is far from comparable to…
bastijn on HN
Requests
Compare results against the Lenna benchmark and file sizes
From 2 comments
Can you try it with the lenna benchmark image and post the results please?
rincewind on HNNice pictures, but they should really have indicated the filesize for the 3000-sample version and given more details about this part: the samples can be saved and zipped up…
userbinator on HN
Smoother interpolation or data-dependent triangulation
From 1 comment
This is neat and the illustrations are great. A few things that will probably give large gains while being low hanging fruit: 1. There are triangle interpolation schemes out…
CyberDildonics on HN
Questions
How does speed compare to other compression algorithms?
From 1 comment
How does the speed compare to other compression algorithms?
bdamos on HN
Alternatives named
JPEG
From 2 comments
Not sure exactly, but wouldn't these images theoretically scale up better than jpeg? i.e. Making a 600x800 image out of a moderately compressed 300x400 seems like these would…
mainguy on HNPNG is lossless, so I don't get the quality comparison. I don't think this approach can compete with JPEG and newer transform based variants for natural photos (event at edge…
darkmighty on HN
Data-dependent triangulation papers by Lehner et al.
From 1 comment
Garland and Heckbert had a nice algorithm for this sort of thing in their 1995 paper, "Fast Polygonal Approximation of Terrains and Height Fields." The paper is mainly devoted to…
a_e_k on HN