4 ms·
I remember a very specific rastering effect with loading images, probably around 1994-1996? The image would load every nth line and then iteratively nth line +
by xxr 3y ago
I remember a very specific rastering effect with loading images, probably around 1994-1996? The image would load every nth line and then iteratively nth line + i until i==n. Compared to what I would see later (just loading in every line from top to bottom), you could get a sense of the whole image sooner, just in an increasing fraction of the vertical resolution. I can't recall which image type this was or whether it was Mosaic or Navigator, but the effect was very distinct; at the time I assumed it was the way the image data was streamed in, but now I'm wondering whether it was just the way the image codec built the viewable bitmap.
- fiddlerwoaroof 3y agoI think this was progressive JPEGs https://www.hostinger.com/tutorials/website/improving-website-performance-using-progressive-jpeg-images https://www.hostinger.com/tutorials/website/improving-websit...
- raphman 3y agoNice demo: https://pooyak.com/p/progjpeg/ https://pooyak.com/p/progjpeg/
- deleted 3y ago[deleted]
- hinkley 3y agoProgressive PNGs added a 2d variant of this, but almost nobody ever used it, because it made the image take longer to load.
- shiomiru 3y agoGIF supports this too: https://en.m.wikipedia.org/wiki/GIF#Interlacing https://en.m.wikipedia.org/wiki/GIF#Interlacing
- zczc 3y agoThat was interlaced GIF, see https://en.wikipedia.org/wiki/GIF#Interlacing https://en.wikipedia.org/wiki/GIF#Interlacing (the demo image in the article is from Chrome which tries to approximate the image with rectangular regions, the 1990s browsers showed not yet received lines as blank which made interlacing effect)
- neckro23 3y agoInterlaced GIFs. Early browsers only rendered the single lines as they came in (leaving the unloaded parts blank), but eventually browsers started doubling the lines so the image seemed to increase in resolution as it loaded. I think MSIE started the latter behavior, and that's what modern browsers do. Progressive JPEGs are somewhat similar, but IIRC didn't gain traction until 2000 or so.
- deleted 3y ago[deleted]