Result by guetzli: 1.3mb image compressed to 692.7kb. With Microsoft Paint, 1.3mb image compressed to 792kb.

google / guetzli

Perceptual JPEG encoder

Apache License 2.0

12.9k stars 976 forks source link

Result by guetzli: 1.3mb image compressed to 692.7kb. With Microsoft Paint, 1.3mb image compressed to 792kb. #93

Closed rdp-in closed 7 years ago

rdp-in commented 7 years ago

Hi,

I just tried this tool and its great. As in, does the job. But when I showed it to a friend of mine, he compressed the same image using Microsoft paint and got a similar result.

So, I'm just wondering how this tool is different and better than the other tools available out there? Also, the time taken by Paint is much less than the time taken by Guetzli.

Is there anyone else who share a similar opinion?

mikesmiffy128 commented 7 years ago

Well, assuming I haven't messed up the maths, that's a 12.5% reduction in size from Paint. There's definitely a difference. Obviously for smaller files it might not be worth the time though. But also, you probably want them to be equal in size in order to compare quality. Rendering two random files doesn't give much of a comparison.

rdp-in commented 7 years ago

I understand that but how do you determine which tool gives a better quality in image after compression?

mikesmiffy128 commented 7 years ago

Look at it. ☺️

rdp-in commented 7 years ago

Lol cool. Just want to know what other people think about this tool. Also @mikesmiffy128 what are your opinions about it? Was all the effort put down to make this tool worth?

saurabheights commented 7 years ago

@rdp-in : This might provide you more context: https://research.googleblog.com/2017/03/announcing-guetzli-new-open-source-jpeg.html . Also, notice metrics on SSIM and butteraugli. P.S. These metrics though work, are not reliable for every case, so testing on one image is not very helpful.

rdp-in commented 7 years ago

@saurabheights : Thanks for the link, even though before using this tool I did went through it. And unlike you I'm not much of an image guy so din't know about SSIM nor about butteraugli. But thanks. Will try to experiment a little bit more on this.