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Doubling image size[message #247198]

Wed, 17 March 2010 05:36

Nephut

Messages:4
Registered:March 2010

I am coding a Java-program that doubles (x and y) the image sizes of JA2 tiles, characters and objects. It should work for 8-bit non-animated files (single image) and 8-bit animated files (multiple images). It will not work for 16-bit files.

The program does the following:
1. read every sti-file in one folder and process images one by one
2. uncompress an image into an internal datastructure
3. double the size (2*2)
4. filter the image
5. compress the image
6. save them to sti-files

The filtering far from perfect and it is probably not a very text-book approach. I have been coding it in an ad-hoc -style, trying something and seeing if it works. I have concentrated on these aspects:
- keep unchanged as many pixels as possible (most filtering is only done on every other line)
- remove blockiness due to 2*2 doubling
- make lines straight; especially 45 degrees and those parallel to tile edges
- keep line thicknesses unchanged

In addition the program processes edges of characters. It corrects color-types (hair, shirt, ...) of some dark pixels in the edge and draws a thin line around characters.

Check out these images before and after double-sizing (click for higher resolution):

http://img689.imageshack.us/img689/4053/ja2hq3.jpg

I extracted the following sti-files out of slf-files ANIMS.SLF and TILESETS.SLF:
Data/Anims/F_MERC/*
Data/Anims/M_MERC/*
Data/Anims/S_MERC/*
tilesets/0/* (excluding subdirectories)

and processed them (about 450 sti-files) with the program. The program ran about 15 minutes (2.4 GHz Core 2 Duo). This is how it looks in-game:

http://img219.imageshack.us/img219/7702/ja2hq4.jpg

Here double-sized are: characters, rooftops, fence , square (below hand), footsteps, bushes, part of road, debris, ...

I haven't tested almost anything in-game, but here are some observations. Scrolling seems to work ok. While walking the mercs tread somewhat, because real distances have not doubled. They can for instance crouch or hop over the fence. The tab above active merc leaves artifacts when walking left. Moving cursor over the artifacts wipes them. The cursor needs to be placed slightly down and right to select a merc.

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[Message index]

		Doubling image size By: Nephut on Wed, 17 March 2010 05:36
		Re: Doubling image size By: CptMoore on Thu, 18 March 2010 03:19
		Re: Doubling image size By: Kaerar on Thu, 18 March 2010 03:47
		Re: Doubling image size By: Headrock on Thu, 18 March 2010 04:14
		Re: Doubling image size By: Kazuya on Thu, 18 March 2010 04:50
		Re: Doubling image size By: Nephut on Thu, 18 March 2010 10:59
		Re: Doubling image size By: Headrock on Thu, 18 March 2010 11:04
		Re: Doubling image size By: Nephut on Thu, 18 March 2010 11:22
		Re: Doubling image size By: Kaerar on Thu, 18 March 2010 12:10
		Re: Doubling image size By: Headrock on Thu, 18 March 2010 12:36
		Re: Doubling image size By: smeagol on Thu, 18 March 2010 13:03
		Re: Doubling image size By: Mauser on Thu, 18 March 2010 13:11
		Re: Doubling image size By: usrbid on Thu, 18 March 2010 13:24
		Re: Doubling image size By: Logisteric on Thu, 18 March 2010 13:25
		Re: Doubling image size By: Will Gates on Thu, 18 March 2010 14:57
		Re: Doubling image size By: Kaerar on Thu, 18 March 2010 15:23
		Re: Doubling image size By: Will Gates on Thu, 18 March 2010 15:32
		Re: Doubling image size By: Kaerar on Thu, 18 March 2010 16:06
		Re: Doubling image size By: Nephut on Fri, 19 March 2010 02:19
		Re: Doubling image size By: Headrock on Fri, 19 March 2010 22:42
		Re: Doubling image size By: usrbid on Thu, 25 March 2010 06:20
		Re: Doubling image size By: marcinfp on Sun, 31 October 2010 20:10
		Re: Doubling image size By: usrbid on Mon, 01 November 2010 09:35
		Re: Doubling image size By: DepressivesBrot on Mon, 01 November 2010 09:55
		Re: Doubling image size By: marcinfp on Mon, 01 November 2010 21:09
		Re: Doubling image size By: marcinfp on Mon, 01 November 2010 21:24
		Re: Doubling image size By: usrbid on Tue, 02 November 2010 07:16
		Re: Doubling image size By: marcinfp on Wed, 03 November 2010 13:06
		Re: Doubling image size By: Czert on Sun, 28 November 2010 13:33
		Re: Doubling image size By: SharkD on Mon, 31 January 2011 15:03
		Re: Doubling image size By: Hawkeye on Wed, 02 February 2011 06:01
		Re: Doubling image size By: wanne (aka RoWa21) on Wed, 02 February 2011 09:21
		Re: Doubling image size By: sorca_2 on Sat, 05 February 2011 01:49
		Re: Doubling image size By: usrbid on Sat, 05 February 2011 11:52

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