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2D All the way! / Doubling the resolution of an image without quality loss?

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Sunflash
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Posted: 29th Oct 2006 20:33
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I guess the title says it all. I've been wondering for awhile now, is there anyway to increase the resolution of an image without loss of quality? I have some 512x512 textures that I would like to double to 1024x1024. Is there anyway this can actually be done?
Thanks,
-Sunflash

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Grog Grueslayer
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Posted: 29th Oct 2006 21:47 Edited at: 29th Oct 2006 21:51
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You can either resize it within Darkbasic or use a drawing program like Paint Shop Pro... they both do just about the same thing. The only difference in Paint Shop Pro you can tweak the image till you're happy with it.

This loads the image and resizes it.
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Sunflash
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Posted: 29th Oct 2006 21:48
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Yeah, but then there's substantial loss in image quality.

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Grog Grueslayer
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Posted: 29th Oct 2006 22:01
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The only way then is to put it into a drawing program and put multiple images of the 512x512 image into a 1024x1024 image... till you get one complete texture.
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Van B
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Posted: 30th Oct 2006 14:09
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You can't, you'd just end up with a bigger and smooth version.

Your asking for detail that was never there, and it's never pretty - really your turning each pixel into 4, and they all have the same colour or they all get blended. DBPro will smooth images, so the results are the same, except for the performance advantage of 512x512 over 1024x1024.

Really if it's a tileable texture, do as Grog suggests and make a 4x4 grid thing, then as long as you don't touch the edges of the image, you can make a 1024x1024 tileable texture from it, like adding detail in the middle, breaking up the pattern with the clone brush.


Scaling down is actually a lot more usefull, like scaling a 1024x1024 image down to 512x512 actually improves it's looks at that resolution - it all depends on screen drawing, try to get the texture resolution to roughly the same as what is drawn on screen at the highest resolution you need. If a texture is only shown at 100x100 on screen, make the texture resolution 128x128. When you start off big, then convert to smaller resolutions for your game, you get a nice anti-alias effect and the results are always better than when you draw at 512x512.

''Stick that in your text and scroll it!.''
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Frank Geppert
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Posted: 1st Nov 2006 11:12
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If you upsize an image it will get blurry for sure. But you could sharpen it a bit and will still not be satisfied. Overlay a detail texture at its native resolution and it will instantly look better. That is the same what game engines do with terrains or upsized models.

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indi
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Posted: 1st Nov 2006 12:21 Edited at: 1st Nov 2006 12:22
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if the texture is a mathematical equation size is irrelevant.
if you dev at 1024 or 512 then export down your future proofing your artwork a few steps ahead.
if the texture is a pattern that can be repeated you can clone it.

if you have the shoddy corel draw from version 9 days it can take a snapshot of the screen at a higher res then the actual 72 dpi and you could with some tweaking get a slightly better result then upsizing.
its the only feature thats usefull in that package.

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bitoart
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Posted: 16th Nov 2006 00:58
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If for some reason, you must have the same image double in size (again, as has been stated, this means each block of 4 pixels are duplicates of the 1 original-), you can avoid the blurring in some art programs (such as Photoshop or Debabelizer Pro) by selecting nearest neighbor as a resample option.
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NA170425
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Posted: 20th Nov 2006 20:35
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Try this.



Pac-Man: A Tutorial on Game Design and Development
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ThinkDigital
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Posted: 24th Nov 2006 20:22
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It is literally impossible to resize a raster image without some kind of quality loss. Only vector images can be resized, in theory, without quality loss.
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NA170425
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Posted: 24th Nov 2006 20:44 Edited at: 24th Nov 2006 20:45
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What do you mean it's impossible? You will not get any quality loss whatsover scaling an image to twice the size unless there's anti-alising or something messing with the colors; each pixel will become 4 pixels. The only time you get quality loss is if you're scaling down or scaling up by a factor that's not a power of 2.

Pac-Man: A Tutorial on Game Design and Development
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ThinkDigital
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Posted: 25th Nov 2006 01:00
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Quote: "each pixel will become 4 pixels"

I was counting that as quality loss.
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indi
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Posted: 25th Nov 2006 05:17 Edited at: 25th Nov 2006 05:17
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photocopying it can produce some results. however whos got a $10000 colour copier at home.
I used that technique with a 72 dpi album cover for a friend by visiting the local Colour Copy World.

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QuothTheRaven
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Posted: 28th Nov 2006 21:20 Edited at: 28th Nov 2006 21:22
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Ok, let's start this thread over.

There are many software applications avaliable that will do this for you, and they use custom interpolation algorithms to achieve results. Take this example page, for example:
http://www.benvista.com/main/skin1/images/content/ourproducts/photozoompro/pzp2_example1.htm
That software costs $150, but I'm pretty sure there are much cheapr ones avaliable, and some that are even free (I haven't actually had a need to use any so I haven't done much work on the subject). I believe that if you resize in Photoshop you want to use Bicubic filtering when you enlarge, and check "resample image" to minimize problems. I believe there are some programs out there which use fractal noise interpolation which I believe works pretty well. It's worth researching a bit.

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Pricey
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Posted: 26th Dec 2006 21:16
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man that guy is UGLY.

:: 3Ghz Pentium 4 / Hyper Threading, 1024mb RAM, 250GB HDD, 256mb Radeon 9600XT Graphics ::


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