Filesize inconsistencies between pixiv and other sites

@CodeKyuubi: > Ars said: > > Yeah, this. The artist simply...

2015-11-09T01:25:52-05:00

Ars said:

Yeah, this. The artist simply uploaded a slightly better quality version to Seiga. I've checked other images recently upload to both Seiga and pixiv and have seen no differences.

That's... rather strange of the artist to do, haha.

@Ars: > CodeKyuubi said: > > Nico post #2172466 has...

2015-11-08T22:37:55-05:00

CodeKyuubi said:

Nico post #2172466 has a smaller size than its pixiv parent.

NWF_Renim said:

The pixiv version of that image appears to actually be the inferior version. The nico version of the image appears to have less artifacting.

Yeah, this. The artist simply uploaded a slightly better quality version to Seiga. I've checked other images recently upload to both Seiga and pixiv and have seen no differences.

@NWF_Renim: > CodeKyuubi said: > > Nico post #2172466 has...

2015-11-08T22:29:10-05:00

CodeKyuubi said:

Nico post #2172466 has a smaller size than its pixiv parent.

The pixiv version of that image appears to actually be the inferior version. The nico version of the image appears to have less artifacting.

@CodeKyuubi: > Ars said: > > What? Care to elaborate?Nico...

2015-11-08T22:04:07-05:00

Ars said:

What? Care to elaborate?

Nico post #2172466 has a smaller size than its pixiv parent.

@Ars: > CodeKyuubi said: > > So does seiga "third...

2015-11-08T19:32:14-05:00

CodeKyuubi said:

So does seiga "third party" images now?

What? Care to elaborate?

@CodeKyuubi: So does seiga "third party" images now?

2015-11-08T18:51:44-05:00

So does seiga "third party" images now?

@Schrobby: > Toks said: > > From my understanding, Tumblr...

2015-10-30T13:33:01-04:00

Toks said:

From my understanding, Tumblr only downscales images that are larger than 1280x1920.
The image in Ars's example is 1280x847 so it didn't get downscaled.

I see. K, so in this special case where both files are edited the twitter one is indeed better. That doesn't change anything in general, though.

@Toks: > Schrobby said: > > Tumblr downscales? I...

2015-10-30T11:24:20-04:00

Schrobby said:

Tumblr downscales? I think you're mistaken:

Result: Tumblr is superior since it's no third party edit.

From my understanding, Tumblr only downscales images that are larger than 1280x1920.
The image in Ars's example is 1280x847 so it didn't get downscaled.

@fossilnix: Artists don't always upload the same file to...

2015-10-30T11:01:04-04:00

Artists don't always upload the same file to each account.

@Schrobby: Tumblr downscales? I think you're mistaken: >...

2015-10-30T10:59:48-04:00

Tumblr downscales? I think you're mistaken:

Ars said:

post #2000942

Pixiv: http://i2.pixiv.net/img-original/img/2015/06/17/20/14/07/50945645_p0.png 853.82 KB

Seiga: http://seiga.nicovideo.jp/seiga/im4933786 853.82 KB

Tumblr: http://digitalflyer.jp/image/117928847779 853.82 KB

Twitter: https://twitter.com/un9man/status/594454266997116928/photo/1 (https://pbs.twimg.com/media/CD_tAV1VIAAK_x2.png:orig) 899.25 KB

Of course, the Twitter source is the only one that is different.

Result: Tumblr is superior since it's no third party edit.

@Toks: > Schrobby said: > > Twitter can't be superior...

2015-10-30T09:24:34-04:00

Schrobby said:

Twitter can't be superior as long as they edit the files. Tumblr has the original art just like pixiv and everywhere else.

Example:
Tumblr: post #2112111 (1280x1316)
Twitter: post #2150093 (1679x1726)

Tumblr scaled the image down, while twitter preserved the original image. In cases like this twitter is superior.

@Schrobby: > tapnek said: > > That's what I'm trying to...

2015-10-30T07:17:24-04:00

tapnek said:

That's what I'm trying to say. Although, in those cases I mentioned, the Twitter source I uploaded was the superior source to the Tumblr one I also uploaded at the time as the Pixiv source wasn't uploaded yet.

Twitter can't be superior as long as they edit the files. Tumblr has the original art just like pixiv and everywhere else.

@tapnek: That's what I'm trying to say. Although, in...

2015-10-30T05:34:59-04:00

That's what I'm trying to say. Although, in those cases I mentioned, the Twitter source I uploaded was the superior source to the Tumblr one I also uploaded at the time as the Pixiv source wasn't uploaded yet.

@Schrobby: > tapnek said: > > Sorry, I should have...

2015-10-30T05:33:38-04:00

tapnek said:

Sorry, I should have clarified that it's deletion through being unapproved, something that has happened to me.

Unapproving twitter posts is also a bad idea. There was discussion about discouraging twitter uploads, but sometimes it's the only source. You never know if and when the art becomes available elsewhere.

@tapnek: > Schrobby said: > > We just talked about...

2015-10-29T22:28:45-04:00

Schrobby said:

We just talked about deletion and that it's a bad idea. Did you actually read the last posts?

Sorry, I should have clarified that it's deletion through being unapproved, something that has happened to me.

@Schrobby: > tapnek said: > > Twitter recompression isn't...

2015-10-29T22:04:33-04:00

tapnek said:

Twitter recompression isn't that serious of a problem when it comes to duplicates. Besides, those can be deleted if they're uploaded by those that can bypass the mod queue.

We just talked about deletion and that it's a bad idea. Did you actually read the last posts?

@tapnek: Twitter recompression isn't that serious of a...

2015-10-29T19:56:13-04:00

Twitter recompression isn't that serious of a problem when it comes to duplicates. Besides, those can be deleted if they're uploaded by those that can bypass the mod queue.

@Schrobby: Yeah, it is a bad idea. The problem it would...

2015-10-29T19:38:56-04:00

Yeah, it is a bad idea. The problem it would solve is most certainly not big enough to warrant it.

@CodeKyuubi: > Schrobby said: > > No matter how you look at...

2015-10-29T18:42:39-04:00

Schrobby said:

No matter how you look at it the twitter recompression is a third party edit. You also have to keep in mind that PNGs are not necessarily lossless, see https://tinypng.com/
Since we don't know what Twitter does and their method could change anytime without notice we'd basically have to do a pixel comparison for every upload to make sure. That would be overkill.

If having a duplicate really is such a big problem a solution could be to migrate all votes and comments from the twitter image to the parent and delete it. I see no need for that, though.

As for the second suggestion, I'd think that after the reaction to Dakutree's same thing, that might not be a good idea, not to mention it punishes users who don't do single-tag uploads from pixiv.

@Schrobby: No matter how you look at it the twitter...

2015-10-29T07:13:53-04:00

No matter how you look at it the twitter recompression is a third party edit. You also have to keep in mind that PNGs are not necessarily lossless, see https://tinypng.com/
Since we don't know what Twitter does and their method could change anytime without notice we'd basically have to do a pixel comparison for every upload to make sure. That would be overkill.

If having a duplicate really is such a big problem a solution could be to migrate all votes and comments from the twitter image to the parent and delete it. I see no need for that, though.