WhisperingPond Posted May 30, 2020 Share Posted May 30, 2020 My search for answers to this question always leads to the size limitations for uploading an image to SL. At the same time I've seen galleries and shops with huge images & artwork. Are they created as mesh objects first? Link to comment Share on other sites More sharing options...
sandi Mexicola Posted May 30, 2020 Share Posted May 30, 2020 One option is to upload your image in parts. For example, you could split your image into 4 equally sized parts, each 1024x1024 Then upload each separately, place each on a large prim, and arrange the prims so that you once again have what looks like a single image. 1 Link to comment Share on other sites More sharing options...
LilithLamia Vortex Posted May 30, 2020 Share Posted May 30, 2020 How big do you need the image to be and what resolution in world? Knowing that makes a difference. Link to comment Share on other sites More sharing options...
Chic Aeon Posted May 30, 2020 Share Posted May 30, 2020 The largest upload is 2018 which becomes a 1024 texture. Mesh has nothing to do with it and most large photos or art are on a simple prim or a mesh cube. The more clear a texture is before upload, the better it will look large. While someone "may" have divided a mesh plane into quadrants to increase the texture size, the ones I have seen were simply very good screenshots to start with. If you find one, you can right click choose OBJECT and INSPECT it and see how many and what size textures are used. For example this is a single 1024 texture on a prim. 1 Link to comment Share on other sites More sharing options...
Nalates Urriah Posted May 31, 2020 Share Posted May 31, 2020 We would need to know what you saw to explain how they did it. I suspect most residents use 1920x1080 screen resolution. A large 4-1024px-images image if displayed full screen would have the system discarding something like 75% of the image data. The extra resolution is only useful if you zoom in to point you only see a quarter of the image on your screen. If you see large images in-world that are sharp and crisp, it may be skill and tech knowledge that allow them to present that nice image. In SL higher rez doesn't help as much as knowing image formats and sizing issues common to SL. If you present an image that is not uploaded using a non-lossy format and sized to work with SL's JPEG2000 storage format and also display it on a prim sized to get the image to a 1 to 1 pixel ratio... the server will jam the image into JPEG2000 format at the cost of quality then later the viewer will resize the image for display and lose a lot of the image quality. It is a PITA to learn how to do good images in SL. Basically uploading a 1024x1024px PNG image with alpha channel is the best you can do. Then place it on a square prim, sides 1x1, 2x2, 3.5x3.5, or similar. After that it is up to the one looking at the prim, which you can't control. 1 Link to comment Share on other sites More sharing options...
Orwar Posted June 1, 2020 Share Posted June 1, 2020 Same thing also applies the other way around, so if you want to hang a picture on the wall that's .5 x .5 meters in size and use a 1024 x 1024 image, that image will be severely compressed when viewed at a distance. Link to comment Share on other sites More sharing options...
Ardy Lay Posted June 1, 2020 Share Posted June 1, 2020 20 hours ago, Nalates Urriah said: We would need to know what you saw to explain how they did it. I suspect most residents use 1920x1080 screen resolution. A large 4-1024px-images image if displayed full screen would have the system discarding something like 75% of the image data. The extra resolution is only useful if you zoom in to point you only see a quarter of the image on your screen. If you see large images in-world that are sharp and crisp, it may be skill and tech knowledge that allow them to present that nice image. In SL higher rez doesn't help as much as knowing image formats and sizing issues common to SL. If you present an image that is not uploaded using a non-lossy format and sized to work with SL's JPEG2000 storage format and also display it on a prim sized to get the image to a 1 to 1 pixel ratio... the server will jam the image into JPEG2000 format at the cost of quality then later the viewer will resize the image for display and lose a lot of the image quality. It is a PITA to learn how to do good images in SL. Basically uploading a 1024x1024px PNG image with alpha channel is the best you can do. Then place it on a square prim, sides 1x1, 2x2, 3.5x3.5, or similar. After that it is up to the one looking at the prim, which you can't control. Why "with alpha channel" in this application? Link to comment Share on other sites More sharing options...
Nalates Urriah Posted June 1, 2020 Share Posted June 1, 2020 7 hours ago, Ardy Lay said: Why "with alpha channel" in this application? PNG comes in two flavours of alpha, with and without alpha. The best you can hope to get into SL is the "with". But PNG without alpha works fine. The with alpha pushes the file to 32-bit, I think. So, "with" is the most complex image you can upload to SL. For an added tweak to the image see: http://blog.nalates.net/2019/02/18/second-life-how-to-get-better-image-quality/ 1 Link to comment Share on other sites More sharing options...
Ardy Lay Posted June 1, 2020 Share Posted June 1, 2020 I don't see how adding a forth 8-bit channel of data that I don't want to use in a photograph is going to help increase image resolution. "Pushing it to 32 bits" as opposed to 24-bits is just wasting those additional 8 bits in the alpha channel. Now, if you want the alpha channel for other reasons, that's fine. 1 Link to comment Share on other sites More sharing options...
Nalates Urriah Posted June 3, 2020 Share Posted June 3, 2020 @Ardy Lay ...it doesn't. The point is that is the most complex image one can upload to SL. Link to comment Share on other sites More sharing options...
Rabid Cheetah Posted June 9, 2020 Share Posted June 9, 2020 Not sure if OP was talking resolution of the image, or size of the object. If the latter, search the MP for megaprim kits. These contain copy-yes super-sized prims from before Linden changed the size limitations on new prims to 64 x 64 x 64 (meters). Note that if you try to edit a megaprim, it will suddenly shift any of the objects dimensions that exceed 64 meters to now be 64 meters. Link to comment Share on other sites More sharing options...
WhisperingPond Posted June 16, 2020 Author Share Posted June 16, 2020 I'll try to find the locations where I originally saw the images. Is it possible that artwork, ie: graphic images that are vector based and can be enlarged, are added to a mesh and then have no limit in size? The images I saw were about 1.5 to 2 times taller than my Avatar. Maybe they aren't photography in the strictest meaning. Link to comment Share on other sites More sharing options...
Nalates Urriah Posted June 16, 2020 Share Posted June 16, 2020 There are no vector image formats available or used within SL. All images are pixel images. All images in SL are stored in JPG2000 format. See SL Image System in the wiki (last update 2007). So, if you see it in SL it is from a JPG2000 source file downloaded from the SL assets system. The conversion from acceptable formats at upload is also why in SL we don't have to worry about infected image files. (Reference) 1 Link to comment Share on other sites More sharing options...
Ardy Lay Posted June 17, 2020 Share Posted June 17, 2020 Would any of this be of use? http://wiki.secondlife.com/wiki/Shared_Media_and_data_URIs Link to comment Share on other sites More sharing options...
Nalates Urriah Posted June 18, 2020 Share Posted June 18, 2020 Have you worked with Media on a Prim? Link to comment Share on other sites More sharing options...
Ardy Lay Posted June 18, 2020 Share Posted June 18, 2020 1 hour ago, Nalates Urriah said: Have you worked with Media on a Prim? That question probably wasn't for me, but I will answer anyway. I have used media on a prim for signs, an SVG clock face and an movie display with an SVG ATSC color bar pattern when there is no movie scheduled. Very few people have media enabled so they don't see them. Link to comment Share on other sites More sharing options...
WhisperingPond Posted June 18, 2020 Author Share Posted June 18, 2020 Okay, here's the link to the place where I saw the large images. They are apparently not photos, but rather graphic artwork. Is that why they can appear large compared to the size of my Avatar? http://maps.secondlife.com/secondlife/Vacit/96/160/74 Link to comment Share on other sites More sharing options...
Nalates Urriah Posted June 18, 2020 Share Posted June 18, 2020 The link lands me on an empty parcel at ground level... Link to comment Share on other sites More sharing options...
WhisperingPond Posted June 19, 2020 Author Share Posted June 19, 2020 Sorry about that. For whatever reason is teleported you across the street. Try this one. http://maps.secondlife.com/secondlife/Fears Trebled/52/32/68 Link to comment Share on other sites More sharing options...
WhisperingPond Posted June 19, 2020 Author Share Posted June 19, 2020 Here's another link. I'll try to catch up with the artist and ask them. http://maps.secondlife.com/secondlife/Bay City - Maddequet/225/104/26 Link to comment Share on other sites More sharing options...
WhisperingPond Posted June 19, 2020 Author Share Posted June 19, 2020 Okay. Here is my last example then I'll let this rest. http://maps.secondlife.com/secondlife/Bay City - Brewster/248/113/25 Link to comment Share on other sites More sharing options...
Nalates Urriah Posted June 19, 2020 Share Posted June 19, 2020 (edited) http://maps.secondlife.com/secondlife/Fears Trebled/52/32/68 - There are no large images here. Everything I can see is at max 1024 and a couple may be less. http://maps.secondlife.com/secondlife/Bay City - Maddequet/225/104/26 - There are some wall paintings on prim cubes less than 2m x 2m that probably use 1024 textures. http://maps.secondlife.com/secondlife/Bay City - Brewster/248/113/25 - Again this areas has maybe 2m by 3m prim cubes with a texture image likely 1024. In none of these areas was anything special or unusual done with the images. Nor are any of these what I would consider large images. I consider them typical. I think your question comes from misunderstanding what you are seeing on your screen. Consider. Your computer screen is likely 24” (0.61m) and that is measured diagonally from bottom left to top right. How can you see a 2x3 meter prim on that little screen? Because the computer is scaling the image. The scaling is very fluid. Roll your mouse wheel. You can zoom out to the point a 2x3m prim is a single dot on your screen. Or zoom in until only a tiny tiny part of the prim fills the whole screen. Now consider that prim having a 1024x1024px texture on a single face/side. When the prim is so small it is 1px across on the computer screen then the computer has to figure out how to place all 1024x1024 = 1,048,576 pixels in one pixel (dot) on your screen. At the opposite end you zoom into the point where maybe only a 10th of the prim is visible to fill your whole computer screen. You can only see a 10th of the 1024x1024 image (102x102 = 10,404px). Those 10k of pixels have to fill your 24” screen that likely uses 1920x1080px = 2,073,600px. The computer is figuring out how to fake (2,073,600 - 10,404 😃 2,063,196 pixels. The viewer and the computer cooperate to provide what it thinks is the best render of those 10k pixels on its 2mega pixel screen. Depending on what you are doing the image will render as blurry or pixelated and possibly a blend of both.. Edited June 19, 2020 by Nalates Urriah Added video Link to comment Share on other sites More sharing options...
WhisperingPond Posted June 19, 2020 Author Share Posted June 19, 2020 Thank you. I see now. Link to comment Share on other sites More sharing options...
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