pseudo hires advancements

[nollkolltroll]

I've made some advancements regarding conversion of pictures to pseudo hires. Here is a sample of picture output:

Lenna_256x192_pseudo-hires.gif (6.85 KiB) Viewed 3372 times

[Steven McDonald_81]

Wow that's amazing!
How did you manage this?

[nollkolltroll]

I use a plain Floyd-Steinberg algo to convert from a grayscale picture, and when I have an ideal byte I get the pseudo-byte that gives the least amount of faulty bits. Then I recalculate the errors around the pseudo-byte and continue. There will be python code released later, if there is interest. It is too rough at the moment for public consumption.

It is also possible to generate 320-wide and/or interlaced modes to get even more resolution.

[Steven McDonald_81]

That's very clever - I was interested in how you managed to pattern match from the limited bit combinations available - analysing for the closest bit match is a clever solution. Very impressed - can you maybe post some more example pictures?

Does your routine allow for different values of the i register?
I could never decide which "I thought" was the most "optimal value'" or bang for the buck - I am sure I settled on 12 for
most of my hires routines and I'm sure from memory most other pseudo hires routines tended to use that value also.. But I do remember testing and looking at the bit patterns available for other values..

[sirmorris]

I think you did OK, Steve

[sirmorris]

I've made some advancements regarding conversion of pictures to pseudo hires.

Not half. Nice work Adam!

[1024MAK]

I honestly don't know what to say...

But do keep at it. Then we can look forward to some more lovely pictures
Great work

Mark

[nollkolltroll]

More pictures will follow when I get the time to generate some. I'll make executables as well, so you can see them on your real zeddies.
I go through all I-values and choose the picture I like best. I had an idea to change I for each line to minimize errors even further, but I doubt I'll see any difference.

[nollkolltroll]

A new example for the ZX81, filling most of the 16k RAM. Not tested on real HW, only EO.

PseudoHires_Metropolis.p

(15.76 KiB) Downloaded 175 times

[PokeMon]

Wow - looks amazing.
Now I am waiting for a Freddy Krueger implementation.