Talk:Requests for comment/Reducing image quality for mobile

Impact on infrastructure
Have in mind that depending on how you'll implement this, you may significantly increase imagescaler/Swift/upload CDN requests and storage requirements for Swift. I'm not saying to not do it, but I'd like to see some risk assessment & load estimates in the RFC itself. I'd also very much prefer for this to be blocked on the implementation of the simplify thumbnail cache RFC, as it may alleviate half of my concerns (but not all). Faidon Liambotis (WMF) (talk) 01:23, 19 March 2014 (UTC)
 * Added some basic guestimations and reasoning. Please provide some basic swift stats (like how many images have actually been scaled down, how many different versions of a single image do we currently have on average, and what is their size vs original) to have better statistics. Having varnish-based thumbnail cache would obviously be a great improvement, but I think we should treat them as two independent projects, unless we know for sure that estimated image-size increase cannot be handled by our current infrastructure. --Yurik (talk) 04:44, 19 March 2014 (UTC)

Authors shouldn't have to worry about compression settings
The idea to have authors specify a quality setting, unless I'm fundamentally misunderstanding the intent, seems very misguided. We should write our software to take performance and efficiency considerations into account, not shift that responsibility to authors. If indeed images should be delivered at a higher compression factor / lower quality in certain use cases, let's identify those use cases, and go as far as we can without introducing markup to specify compression settings before even thinking about doing so.--Eloquence (talk) 02:26, 19 March 2014 (UTC)
 * This feature is not for authors, but for internal/advanced use - when we are serving image to a mobile device on mobile network, the goal is to automatically reduce image quality to reduce wait time. Additionally, this might also benefit users who pay for their data plan per MB, as it would allow us to create low/high quality mobile settings. --Yurik (talk) 04:44, 19 March 2014 (UTC)


 * If it's not for authors, I fail to see why it should be added to the markup (and your proposal contradicts that statement: "[t]his parameter might be used by various template authors").--Eloquence (talk) 06:35, 19 March 2014 (UTC)


 * Sorry, wasn't clear. This is MOSTLY for internal use, but there might be advanced authors out there who might decide to reduce image quality in addition to reducing pixel size for some obscure template. After all, if we provide rotation and scaling, why limit the toolset? And since the generated image URL is exposed to the world, why not do a well documented parameter as well? In any case, I am ok to not include it if the community is against it/there is a technical reason not to. --Yurik (talk) 07:16, 19 March 2014 (UTC)