Re: Maximum image size ?
Re: Maximum image size ?
- Subject: Re: Maximum image size ?
- From: Jens Alfke <email@hidden>
- Date: Thu, 22 Sep 2016 11:04:58 -0700
> On Sep 22, 2016, at 10:03 AM, Gary L. Wade <email@hidden> wrote:
>
> If you are dealing with truly astronomical image data, consider that "trying it yourself" may require multiple machines and/or multiple dedicated GPUs similar like how you see those multi-monitor displays shown at conferences and marketing displays.
Or just (conceptually) break the image into tiles, and only load tiles into memory when they’re being displayed or edited, probably using an LRU eviction scheme. You’ll probably also need to store some scaled-down versions of the image, if you ever display a zoomed-out view that can display a large subset of the image at once.
This is nothing new. Old versions of Photoshop had to do this, back when RAM was scarce and most computers didn’t have virtual memory. (Heck, Photoshop probably still does this, because people do edit ridiculously large images in it, like 1200dpi posters.)
—Jens
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