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Scaling to tiny (tiny!) pictures

May 16, 2012, 02:06
Post: #1
Scaling to tiny (tiny!) pictures
G'day,

Just a question about scaling and pixelation. I've been doing some 3D models in ZBrush at a 960x960 size, and wanting to scale them down to 48x48 size, very small icons for a game engine.
Anyway I started doing this with just normal scale in GIMP, but the picture just turned out like a big blur. With further investigation I found GIMP add-ons, Liquid Scale and Step Scale (I think that was it's name) where you can step down the scale of the picture and sharpen it during step downs etc.
Still not having much luck, I can get it to look better, but not good, still very pixelated and blurry. The required result I want is something along these lines - Picture
Using high res picture, I've tried PNG, GIF, PSD with not really much luck.
Just wondering if anyone knows of another gimp method to get the required results I'm after? or Any techniques you might know of? Smile
Cheers.

PS: Attached is the original model GIF and the resized picture.


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May 16, 2012, 06:11
Post: #2
RE: Scaling to tiny (tiny!) pictures
I can't see your example picture - all I get is a 403 - FORBIDDEN error... Huh

Here's my go:    
  • Changed image mode to RGB
  • Step scaled in 3 steps
  • small bit of sharpening

I didn't choose to distort the image the way you have, so it's the same scaling horizontally and vertically.

Kevin
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May 16, 2012, 06:17
Post: #3
RE: Scaling to tiny (tiny!) pictures
Hmm weird about the example picture, anyway it's pretty much a squashed down blurry version of the big one.
Wow that looks MUCH better then what I was doing.

I'm not on my home PC at the moment, so I shall try this tonight.
When you say distort the image, do you mean me sharpening it at every step down scale?

Sweet, cool okay thank you very very much for the post!
I'll send this home and give it a whirl tonight Smile
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May 16, 2012, 06:34
Post: #4
RE: Scaling to tiny (tiny!) pictures
(May 16, 2012 06:17)LordSoth Wrote:  When you say distort the image, do you mean me sharpening it at every step down scale?

Don't sharpen the intervening steps as it won't help.

When I say distort - your thumbnail above has stretched the skeleton horizontally to fill the square - leaving it looking distorted to me.
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May 16, 2012, 06:39
Post: #5
RE: Scaling to tiny (tiny!) pictures
At that scale, the bones are one or two pixels wide, so you can't get a sharp image. You only have 2304 pixels to a complete skeleton... Icons are rarely just scaled down images. A cop out is to use only a significant/recognizable part of the image (like the skull)

This said, changing the aspect ratio like you did may increase the blur. My own attempt:
- extraction from background
- scale down
- add background back
- unsharp mask (1./1.)

[attachment=1156]

Now answering your questions on
https://Gimp-Forum.net
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May 16, 2012, 06:39
Post: #6
RE: Scaling to tiny (tiny!) pictures
Oh yes I see, thank you.
Yes he is looking a bit fat and stretched, cheers for all your help mate!
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May 16, 2012, 06:39 (This post was last modified: May 16, 2012 06:43 by LordSoth.)
Post: #7
RE: Scaling to tiny (tiny!) pictures
Thank you so much for replying ofnuts.
Great to have different methods so I can try and play with them!
Thank you all so much for your help.
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May 16, 2012, 09:32
Post: #8
RE: Scaling to tiny (tiny!) pictures
I'm home now, I've set the mode to RGB and then tried to scale using the Step Scale script, but I'm still getting weird results, attached are the settings on my scale.
and The second attachment is the end result.


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May 16, 2012, 10:20
Post: #9
RE: Scaling to tiny (tiny!) pictures
To judge from those settings, you've taken your original rectangular image and re-sized it to a square image. Try cropping your original to square to start with.

I'm guessing here, but the step size percentage set to 10 will scale in 10 steps (?). Try setting that to 25 to scale in 4 steps.

Kevin
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