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Shouldn't this task be restricted to GIFs? PNG was designed as a replacement for the GIF format, not for JPEGs. JPEGs should remain as JPEGs. Also, how are you planning on handling animated GIFs? Does your bot specifically detect and ignore them? Are you also planning on converting all SVG images? If
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I was thinking about this, but came to the conclusion that this is also unsuitable for a bot. A while back, I tried surreptitiously running a mass-deletion bot under my main account that would find and remove duplicate images, and the one crippling (and unfixable) flaw was that it wasn't able to
218:. If the lightest of these three resultant PNGs is smaller than the original image, the bot will upload it, preserving the image page and adding on all of the history associated with the old image. Lastly, it will update all references from the old image to the new PNG and tag the old image with
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should be changed to .png. For example, if this bot converts Image:ASDGGFCHJGV.gif, and the old image had {{rename media|Picture.gif}}, the new image Image:ASDGGFCHJGV.png should have a template that now says {{rename media|Picture.png}}. Hopefully I explained this correctly.
521:, some with a suggested title, some without). I can think of no better time to rename them than when a bot is re-uploading them anyway. It would certainly add another layer of complexity to this task, but I thought I would throw it out there. -
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choose which filename should be preferred. The same problem pops up here: a bot just isn't smart enough to figure out that moving
Descriptive_filename_12.jpg to a8fh3jkg9f3j39f.pdf or HAGGER?????.jpg isn't appropriate. To distill somewhat, the
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Just like it says on the can, this bot will attempt to optimize all images on the
English Knowledge. On the first run, I'll let it loose on all images; from then on, it'll only attempt to convert ones tagged with
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there is a reduction in filesize. The artifacting problem is a whole different beast that is far removed from what this bot is intended to do; this task will neiter resolve nor exacerbate the problem in the
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contains a field for the new filename, including extension. If this bot converts an image with the rename template, the template should be carried to the new file - but possibly the file extension in
468:. Alternatively, I can attempt conversion as usual and preserve the tag, which is the current behavior; again, this doesn't affect the problem of the image being rasterized to begin with.
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I would agree with that...we have a separate process for renaming and I think that's appropriate. The one thing that could possibly be taken into consideration here is that the
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Animated GIFs, multi-layered or indexed XCFs, and vector images will be completely ignored. PNGs will also be skipped over, but I might try that with a later bot.
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228:. All free images will remain until a human decides to clear out the PNG duplicate backlog, and all fair-use images will eventually be killed off by the bots.
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Why are uploading them as 'new' images? Can't you just replace the existing one with the new version? Also, why don't you run this on commons as well? --
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Well, uploading a PNG over a JPEG or GIF is kind of silly, no? Notwithstanding that, MediaWiki will automatically rename the file anyway.
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I like this idea and am inclined to trial it if I don't hear objections soon. Can you resize large unfree images during the conversion?
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images for which only a JPEG source is available; recompressing with PNG will not remove artifacts and will produce larger files
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Is it worth trying to convert JPEG images? I'd expect that JPEG artifacts would compress especially poorly in PNG format. --
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Approved for trial (20 edits). Please provide a link to the relevant contributions and/or diffs when the trial is complete.
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Most bitmaps can be expressed as vector data given the effort anyway, but I can skip over all images already tagged with
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Thanks for taking the time to answer my questions. I think I'm satisfied that you've thought this through sufficiently.
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I would recommend applying the same criteria to this task, i.e. only converting non-animated GIFs (and maybe
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Rather than sic it on random images, I decided to cherry-pick the test sample to cover all possible bases.
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The only thing that pops into my mind is that there are a handful of images (just a handful) in
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If I manage to downsize even a pittance of a thousand JPEGs, I'll have done some good here.
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Convert all images on the
English Knowledge to the more efficient PNG format when necessary.
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Ok, I understand, just checking, I do see where certain images would be worse resized.
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Thanks for the questions and ideas! Is there anything I've missed or can help with?
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There was one bug: the wikitext in the edit summary portion of the history in
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animated images. PNG does not support animation so GIF should be used instead
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was a well optimized JPEG which remained untouched, save the removal of the
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Yep, that's a great idea, and one which I've thrown into the code now.
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True, recompressing JPEGs will not remove artifacts, but it will only
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The above discussion is preserved as an archive of the debate.
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was a poorly optimized JPEG, which the bot correctly moved to
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This is not a task which I feel is appropriate for a bot.
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produce larger files; images will get the reup treatment
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images which contain strictly vector (non-raster) data.
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I expect so, but it's my computing cycles being wasted.
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Subsequent comments should be made in a new section.
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Subsequent comments should be made in a new section.
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36:The following discussion is an archived debate.
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509:Category:Images which should be in PNG format
812:Approved Knowledge bot requests for approval
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440:To answer your questions one by one:
396:This template should not be used for
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745:. I can haz approval plz?
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793:Please do not modify it.
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159:Already has a bot flag:
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247:Discussion
208:advpng -z4
113:rights log
103:page moves
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108:block log
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300:Carnildo
83:contribs
51:Approved
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778:MBisanz
684:badJPEG
660:badJPEG
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286:MBisanz
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200:convert
183:badJPEG
130:east718
59:718 Bot
722:badGIF
216:pngout
214:, and
193:badGIF
188:, and
665:with
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445:often
206:plus
88:count
16:<
752:east
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606:east
555:east
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425:s).
382:The
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98:logs
78:talk
68:BRFA
756:718
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407:SVG
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161:yes
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Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
