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Screen 2 converter

Wednesday, June 13, 2007 - 14:11
Submitted by: snout
Topic: Development

ARTRAG has sent us a nice utility which we have just added to our MSX downloads corner. It's a SCREEN 2 converter based on MSX Screen Conversor by Rafael Jannone, but coded in C this version is a bit faster and more accurate.

Relevant link: Screen 2 converter

By Google

By ARTRAG on June 13 2007, 17:58

The converters are two:
1)
The first is a C implementation of Jannone's algorithm.
The main improvement is the speed-up (1500 times faster, due to some optimizations and to the differences between interpreted/compiled languages) and the numerical accuracy.
2)
The second is a patched version of the previous algorithm that uses a perceptually uniform distance in the color space.
The speed decreases (still 150 times faster than Jannone's) but the errors in colors should be less evident.

Both converter are limited to work on 24bit TGA files (this is bad) but you have the C source,
so you can include their core in your own projects.

By NYYRIKKI on June 13 2007, 23:13

I hope these kind of optimizations will find their way to BMP2MSX. Although it's not been updated lately the source is available and it is still the most used PC -> MSX graphic converting tool.

By turbor on June 14 2007, 09:02

BMP2MSX sources are available??

Where ? Can you give an URL?

By Huey on June 14 2007, 10:20

@turbor: Google is your friend

But i'm feeling helpfull today; click on 'source file'

By ARTRAG on June 15 2007, 12:10

@NYYRIKKI
should you need a screen4 version able to optimize the palette for a new edition of D&D demo....

Seriously this could be the base for a EVA video converter in screen 2 or 4
Noting to do with VDPENC (here with EVA, HD is mandatory), nevertheless this could be an appealing tool for videos on MSX

By ARTRAG on June 15 2007, 23:20

@dvick
what about integrating Floyd-Steinberg dithering in the BMPTO105 ?
It could improve a lot the final result of the conversion at no z80 cost.

By dvik on June 23 2007, 19:43

Yes I think that could make a significant improvment. I think wolf_ suggested something like that earlier.