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Some converted Spectrum 512/4k images

Posted: Tue Feb 23, 2016 8:52 pm
by Anima
A new feature has been added to the Retro Image Tool: creating Spectrum 512/4k images. Just set "Colours" to "Spectrum 512/4k" and choose either "512 (ST)" or "4096 (STE)" for the palette option, also please set the dither option to "Floyd-Steinberg 75%".

Now the original images will be resized to fit the 320x200 pixels resolution when loaded. Recommended source pictures should have a 16:10 aspect ratio like 1280x800 or 1920x1200 pixels. It's still not perfect but probably a neat tool to play around with.

The images in this post can be found in this Spectrum 512/4k demo archive.

Some notable results with the ST version left and STE version on the right side (click on the image to download the Spectrum 512/4k format image):
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Re: Some converted Spectrum 512/4k images

Posted: Tue Feb 23, 2016 9:19 pm
by Cyprian
looks really cool.
what is the difference between "16 PCHG" and "512/4k"?

Re: Some converted Spectrum 512/4k images

Posted: Tue Feb 23, 2016 9:50 pm
by Anima
Cyprian wrote:looks really cool.
what is the difference between "16 PCHG" and "512/4k"?

Thanks.

16 PCHG (PaletteCHanGe) means that a new 16 colour palette is available for each line while the classic Spectrum 512/4k approach alters the palette two times in a line so up to 48 colours can be shown. Unfortunately the 48 colours cannot be chosen freely as only 16 different colours are available at each X position within a line. So in general the resulting quality is better using the Spectrum 512/4k format. Note that that format, however, is only compatible with the 8 MHz machines since it is based on an exact pixel timing.

Hint: you can use RECOIL to display the SPU images.

Re: Some converted Spectrum 512/4k images

Posted: Tue Feb 23, 2016 9:57 pm
by TheNameOfTheGame
Really nice results!

Re: Some converted Spectrum 512/4k images

Posted: Tue Feb 23, 2016 10:13 pm
by FedePede04
awesome

Re: Some converted Spectrum 512/4k images

Posted: Tue Feb 23, 2016 10:50 pm
by DarkLord
That's really good stuff - thanks for all the hard work on this. :)

Re: Some converted Spectrum 512/4k images

Posted: Tue Feb 23, 2016 11:07 pm
by Anima
Thanks all. Hope to find the time to add the great Photochrome format as well. ;)

Re: Some converted Spectrum 512/4k images

Posted: Tue Feb 23, 2016 11:12 pm
by lp
They look really nice in zView too. Nice work!

Re: Some converted Spectrum 512/4k images

Posted: Tue Feb 23, 2016 11:25 pm
by CiH
Wow - Cool!

Re: Some converted Spectrum 512/4k images

Posted: Wed Feb 24, 2016 10:55 am
by AtariCrypt
Wow those are beautiful. Nice one!!
Steve