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Forums > CSDb Discussions > Game screenshots in Koala format
2020-08-30 21:57
CommFor

Registered: Mar 2017
Posts: 19
Game screenshots in Koala format

How to make lossless C64 game-screenshot in Koala format?
2020-08-30 22:06
Groepaz

Registered: Dec 2001
Posts: 9532
use VICE?

that said, of course not any arbitrary image can be saved that way, due to sprites.
2020-08-31 07:06
CommFor

Registered: Mar 2017
Posts: 19
Thanks to K.C.'s very old post in Lemon64 forum, I found the way to take a game screenshot in exactly 320x200 resolution (official working area of C64 screen) in 16 colours using CCS64 emulator - of course, sprites are included in picture.

Is there a tool to convert that BMP picture to KLA format?
Timanthes and Pixcen can't do that losless in demanding games like Mayhem.
2020-08-31 11:11
MagerValp

Registered: Dec 2001
Posts: 985
The koala format can not represent sprites or raster effects, which are used heavily in games, and especially in Mayhem. There are vanishingly few games that use plain multicolor bitmap mode.
2020-08-31 12:20
CommFor

Registered: Mar 2017
Posts: 19
Got it, but is it possible to grab picture in C64 emulator in losless format like BMP (emulator screenshot has sprites, rasters etc.), and than convert to Koala without loosing details?

Working area of Bitmap screenshot is 320x200 in C64 emulator using C64 palette (actually it's game in 160x200 resolution in almost all cases), Koala format is 160x200 using same C64 palette - in theory this should work without loosing details.

Any program to play with it?
Pixcen is not perfect for that.
2020-08-31 12:27
ptoing

Registered: Sep 2005
Posts: 267
The problem here is that most game backgrounds do not use Koala as such, but multicolor char mode, which also can have hires chars in it.
2020-08-31 12:39
youtH

Registered: Aug 2003
Posts: 8
I made a tool that can convert from PNG to koala. If you disable dithering it might give decent results. Or not :)

https://github.com/micheldebree/retropixels
2020-08-31 13:21
Groepaz

Registered: Dec 2001
Posts: 9532
like i said before, you can make a koala snapshot using VICE. it wont get any better than this, other tools cant remove the restrictions either :)
2020-08-31 15:01
MagerValp

Registered: Dec 2001
Posts: 985
Quoting CommFor
in theory this should work without loosing details.

I don't know what you base that theory on since it's obviously not true. You need to read up on C64 graphics modes and their limitations.
2020-08-31 15:09
Deev

Registered: Feb 2002
Posts: 167
As everyone else has said, this isn't going to work (apart from perhaps games that don't use many colours and everything is in 160x200, unlike Mayhem).

If you want to take a screenshot of a game like Mayhem and convert it to a stand-alone C64 prg, your best bet would be Mufflon V1.0 although it's still unlikely to be perfect.
2020-08-31 16:52
CommFor

Registered: Mar 2017
Posts: 19
@youtH,
I'm sure your program is good for bigger pictures, but for small ones like C64 screenshots is not good at all, even without dithering. Pixcen is much better for conversion to Koala format.

@Groepaz,
Try to save Turrican II screenshots in Koala format with VICE. Messed-up screens without any visible graphics, nothing else.
On other hand, I have relatively decent results converting VICE Bitmap screenshots with Pixcen to Koala format. A bit blurry, and sometimes colours are also not accurate. I don't know why colours are problem here, it's same palette!
That means VICE doesn't give best results all the time with ripped game screenshots in KLA format.
I also don't like three keys should be pressed simultaneusly to take game screenshots in latest VICE version 3.4. Much less used shortcuts using two.

@MagerValp,
160x200, multicolour, Koala format, all that I need.

@Deev,
Thanks for suggestion. I will try it.
Can you also suggest program for doing opposite - converting prg file to koala?
Backbit Tool allowing to make slideshow of Koala pictures with SID included in BBT format. I would like to make Slideshow of best pictures according to CSDB ratings, but most of them are in prg format.

@All,
Reason why I'm looking for optimal results for game screenshots in Koala format is because I want to make BBT files out of C64 games - it's a BackBit format allowing slideshow up to 10 Koala pictures, 1 SID tune and text infos for each game (game is also included in BBT file).
If nobody helps, I will be on my own to rip and convert to KLA format few thousands game pictures, but before starting doing it, I need to find way to have most accurate graphical screenshot output in Koala format.
 
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