Howdy, thank you for being responsive to this issue and addressing our concerns. While I appreciate the concessions the development team has made to attempt to satisfy the artistic community as a whole, I have a few counterpoints I’d like to share as an illustrator who has moved to twitter as one of my main social media and art sharing platforms.
I’ve been following this thread since its inception as I wanted to see if the backlash would warrant a mediated response that would make all artists happy, not just sketch and pixel artists. This new amendment for preserving PNGs at low resolution absolutely does not resolve the issue for digital illustrators with high levels of detail, such as some of the work I do.
I’ve linked a thread containing a visual example of the size difference in images with non-uniform height-width ratios, such as landscapes. While twitter has always been unfriendly to previewing these images, often focusing the preview on portions of the image that aren’t relevant, the proposed 900px constraints would cripple the level of detail available for artists who only understand uploading with PNGs for the best image quality: https://twitter.com/Oricalcon/status/1081416456095584256
I’m a lucky subset of the population that is both an illustrator and a software/web developer, so I’m a bit more educated on how to preserve image quality across file formats and resolutions. However, the vast majority of artists simply know that PNG format is the best for maintaining image quality when uploading to the web.
These individuals would still attempt to upload their images at ratios higher than 900px at largest, causing the “test” to compress to JPG and litter images with visual artifacts. Using @RWStandard ‘s post as an example, the visual artifacts that occurs would be prevalent throughout these illustrators’ images. The compression is much, much more visible on digital illustrations than in photography.
TL;DR: I would be much more comfortable with these changes if twitter were to provide an image preview, a tool, or a link to a converter such as the one @RME utilized for comparison, that would allow artists to see what their uploaded image will look like, or test images themselves so they can maximize quality while minimizing data costs on Twitter’s end. This allows the artist to put their best product forward within Twitter’s new constraints, instead of throwing compressed images littered with visual garbage out to their followers without understanding why their images were so thoroughly trashed.
If none of these proposed concessions are possible, then the best step would be raising the PNG size limit to a much more reasonable 1200px at largest (Still a whole 750px smaller than popular art sharing platforms such as Tumblr) at the cost of a little bit more of these “global user” speeds, as for complex illustrations, 1200px is a much more reasonable image size than 900px.