   Editing huge images (21600 x 10800 pixels)... nothing works!
  I've just downloaded a highly detailed texture of the earth from NASA's Visible Earth, which is a JPEG of 21600 by 10800 pixels. And believe it or not, that's the small version, as the texture I'd actually like to use is 86400 by 43200 pixels... This of course won't work in any real-time application, but I figured I could cut it up into little pieces and try to page it in when needed...So, I've tried opening the 'small' one in Paint Shop Pro 8, Paint.NET, ATI's Compressonator, 3D Studio Max 5 and a bunch of other programs, but they all either crashed or complained about having too little memory available to open the image... My machine has 2GB RAM, so I'd think that should be sufficient to open a 20 MB JPEG, no? When I calculate the size of an equivalent 32 bpp bitmap (with 21600x10800x32 / (8x1024x1024) ), I end up with an uncompressed size of 890 MB, which should fit quite comfortably into my 1.4 GB of free RAM...Now, if it would be simply impossible to open the image, I'd have moved on. However... the only thing that seems to be able to open the image is the friggin' default Windows image viewer!!! Aside from making me wonder why pricy commercial products get outperformed by this free viewer, it proves that it can be done.So, anyone have any clues on how I can open this image for editing? Any graphics package that would do the trick?   
  You could always start print screening from Windows Picture and Fax viewer ;).   ;  I've not had problems with Photoshop (though never tried such large images)... and there is a free trial of CS2.;  Graphical editors usually need a buffer to store the result of an operation. That buffer must at least be a large as the source image, so you effectively need twice as much memory to edit it. Viewers don't need this extra memory.   ;Quote:Original post by benryvesI've not had problems with Photoshop (though never tried such large images)... and there is a free trial of CS2.Would you (pretty please ;) be so kind to download a map from the Visible Earth link above to check if PhotoShop will load it? I know Paint Shop Pro is a poor man's PhotoShop, but I doubt PS will be better in this regard... I just checked PSP and you can create images of 32k x 32k pixels with it (it's slow but it works), so I'm a bit puzzled why it can't open the JPEG.Thanks for the link to the trial though, I'll download it too to check it out.Quote:Graphical editors usually need a buffer to store the result of an operation. That buffer must at least be a large as the source image, so you effectively need twice as much memory to edit it. Viewers don't need this extra memory.I figured as much. But even those 1.7GB should fit into my pc's RAM, and then it can always use virtual/swap memory as it needs... Very strange.As an alternative I might be able to page in the texture data directly from disc, but unfortunately I don't know if that's even possible with the JPEG format. With bitmaps the paging seems simple enough, but going from my limited understanding of the JPEG format, I don't think there is an (easy) way of extracting arbitrary rectangles from the image on the disc.Would anyone happen to have a tutorial or article about this? I've looked around on GameDev and on google, but I couldn't find anything useful.Thanks again :)   ;  I edit images this size in photoshop all time time on a system with 1gig of RAM. Try using it.   ;  I downloaded the file world.topo.200412.3x21600x21600.D2 (which is a 12MB file) for Nasa's website and opened it up in Photoshop Elements 2.0 no problem. Granted it took a minute to open, but it still worked fine. I've only got a GB of RAM as opposed to 2.Try Gimp.   ;  Thanks for checking it, I'll try both PhotoShop and Gimp.Edited: for future reference, the Gimp works just fine for these images. Just make sure you have more than 1 GB of RAM for smooth operation, as it took 1.25 GB to load and scale the 21600x10800 image.[Edited by - remigius on December 7, 2005 7:04:39 AM];  I have a Sapphire X800XT Radeon Pro with 512 MB of video memory and 2 GB of main memory. It took 42.11 seconds to open the image itself in PS (but it displays a progress bar so you can see it's not hanging). I did a few blur operations, added some text, and spliced some stuff onto the pixels; it was pretty responsive. I didn't try opening it in Gimp.   ;  A bit out of topic but what is the detail level reached by the largest picture? Unlukily I have only 512Mb so I don't feel like download it just to know that.   