Hi Marcos,
If it's of any use, I did a quick hack version of my shamview converter to keep
the full image at 16 colours. It scales the source image to 256x192 and
converts to SAM palette, then picks the top 16 colours to use for a final
conversion. Script is here: http://obo.homeip.net/img2sam.py
It doesn't give a properly optimised palette, and dithers for any missing
colours, but those could probably be improved upon (tolerance for nearest
colour matching perhaps). It also generates PNG output, but converting to SAM
mode 4 and wrapping in a disk image probably wouldn't take much work.
Si
On 12 Dec 2012, at 03:44, Marcos Cruz wrote:
Hi,
I've edited the WoS' page about Fred 46
(http://www.worldofsam.org/node/567) to include an interesting program
I recently discovered while searching all disk magazines for useful
tools and info: 'BMP to SAM' by P.Crompton ('SAM to BMP' is there too,
but I don't need it).
I've been tinkering with it in order to import images and grab them for
a project. It works fine, but it was not easy to create BMPs with the
exact requirements. At the moment I use a combination of manipulations
with mtPaint and commands from the netpbm tools (both in Debian), though
the palette conversion is not working fine yet. Fortunately, the mail
list archive is a good source of info, e.g. the following old threads:
http://news.gmane.org/group/gmane.comp.systems.sam-coupe/thread=1422
http://news.gmane.org/group/gmane.comp.systems.sam-coupe/thread=22779
I hope I'll eventually find out a way to automate the conversion from
the original BMP (or other format) to the final MGT disk image with the
final mode 4 screen.
I suppose P.Crompton is the same Paul Crompton mentioned in other Fred
issues. Can someone confirm? If so, I'll complete the entry.
By the way, can he be contacted? I'd like to take a look at the Z80
source, maybe do some changes or translate the algorithm. It wouldn't be
difficult to dissasemble anyway.
Marcos
--
http://programandala.net
