| From: | Matt Sealey |
| Date: | 18 Apr 2001 at 14:52:12 |
| Subject: | Re: Voyager Image Decoders |
Hello paul@lagernet.clara.co.uk
On 18-Apr-01, you wrote:
> --- In amigactive@y..., Matt Sealey <matt@k...> wrote:
>> Hello Andrew
>>
>>> And I'd agree that Voyager's ditthering is rubbish, it looks
>>> pathetic in 256 colours.
>>
>> It's a fairly standard algorithm though.
>>
>>> iBrowse is so much better.
>>
>> Oh you JEST. IBrowse's dithering is absolutely ABYSMAL.
>>
>> The result?
>> Well, I'll show you the result..
>
> Hmmm. How can you judge the dithering abilities of 2 programs with 1
> image and a fixed number of pens?
IBrowse and V weren't running simultaneously, and even if they were
I have them on seperate, 256 colour screens :)
> If you're not using a graphics card by 2001 you *deserve* crappy
> dithering :-)
It's on the cards, I just need to wait to get paid.
I think I'll like my PPC, G-Rex and whatever-card-I-can-find.. the
only thing stopping me
>> Dithering is a process of substituting colours for others in
>> patterns to give the impression of a colour you don't have.
>
> No it isn't. That would look crap. Dithering is the process of
> scattering different colour pixels to give the impression of more
> colours. See the Halftone, Floyd-Steinburg, Stucki etc. algoritms.
Which are all ways of spreading pixels in defined patterns (either
using crosshatching, different sized blobs, or error values) to give
the imression of colours you don't have.
Isn't that what I said? Voyager's FS algorithm is top-notch for
quality images.
>> It is NOT placing pixels in a fuzzy mess so that if you squint then it
>> MIGHT be that colour if you wished and wished, or looks like good
>> dithering on a 14" TV screen.
^^ which is what IBrowse does. Or seemingly so ;)
Thanks
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