Oh yes, this is nice. I saw similar things in the past, AFAIR this was
published on some disk magazine back in 90's. But it will be hard to find it
now.
So how many colours are possible per line in this format? Or what is
possible in this picture format?
Also, I think that the converter could possibly de-noise the picture before
or after the conversion. Or something like that. Because there are too many
dots visible in places where there should be no dots. This is good in high
resolution graphics like when printing on printer in 600 DPI, but doesn't
look too well on Sam. Especially in emulator with crisp LCD display. ;-) I
think the whole de-noising process is extremely important when converting to
low resolution and low bitdepth. And each single picture needs a different
values for the algorithm, so maybe there should be some kind of WYSIWYG
editor or something where users could change some settings and see the
result immediately in order to find the best settings for each file. ;-)
Maybe a genetic algorithm could help to find at least some local optimum.
/---
Aley
-----Původní zpráva-----
From: Simon Owen
Sent: Saturday, March 24, 2012 3:10 AM
To: sam-users
Subject: SAM HAM viewer
Hi all,
I've been experimenting with HAM-style tricks on SAM, to try to improve
the quality of converted images. I've aimed to modify as many colours
as possible between lines, rather than using the traditional compromise
static palette. Are there any viewers using that technique already?
I've written a Python script to convert regular images to a new .sham
format, and a SAM viewer program to display them.
Demo: http://simonowen.com/sam/shamview/shamview.dsk
Source code: https://github.com/simonowen/shamview
You might recognise some of them as SAM or image processing favourites!
It still needs work on the dynamic palette selection, which just uses
the most-frequent colours, rather than doing proper quantisation. I
left the crayons image as an example of this breaking down.
Si
-----------------------------------------
Mgr. Aleš Keprt, Ph.D.
private: a...@keprt.cz, www.keprt.cz
office: Moravian College / Moravská vysoká škola Olomouc, ales.ke...@mvso.cz
