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Groups > comp.sys.acorn.programmer > #6385

Re: Reading the dimensions of a sprite or JPEG on disk

From Paul Sprangers <Paul@sprie.nl>
Subject Re: Reading the dimensions of a sprite or JPEG on disk
Newsgroups comp.sys.acorn.programmer
Date 2022-06-11 08:56 +0200
Message-ID <59f6c11f76Paul@sprie.nl> (permalink)
References (8 earlier) <59f119bd97Paul@sprie.nl> <_-CdncrtZoeZZQj_nZ2dnUU7-UPNnZ2d@brightview.co.uk> <59f13aedf2Paul@sprie.nl> <Aa-dnfbF4Md84gv_nZ2dnUU7-KHNnZ2d@brightview.co.uk> <mpro.rd434c00756yg00vg.spamtrap@mw-software.com>
Organization None

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In article <mpro.rd434c00756yg00vg.spamtrap@mw-software.com>,
   Martin Wuerthner <spamtrap@mw-software.com> wrote:

> In terms of quality you are much better off using ChangeFSI, since
> SpriteOp 52 scales down in a very naive way, which causes massive
> aliasing effects, while ChangeFSI interpolates between pixel values and
> uses error diffusion.

I can confirm that. ChangeFSI does a very good job from within a BASIC
program, but not by using its library function as described in the
documentation. At least, I certainly failed to get it working. Using the
command line instruction however, and start that as a Wimp_Task, did the
trick. No need to mess with local memory blocks or sprite areas or
whatever. It rescales every JPEG, no matter how large, to the desired
dimension, quickly and transparently.

Now that this problem has been solved, I'm running into a new one. But
that's for another thread.. Thank you for all your thoughts and
suggestions.

Kind regards,
Paul

-- 
https://riscos.sprie.nl

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Thread

Reading the dimensions of a sprite or JPEG on disk Paul Sprangers <Paul@sprie.nl> - 2022-05-28 12:08 +0200
  Re: Reading the dimensions of a sprite or JPEG on disk News <chrisjohnson@spamcop.net> - 2022-05-28 11:37 +0100
    Re: Reading the dimensions of a sprite or JPEG on disk Paul Sprangers <Paul@sprie.nl> - 2022-05-28 12:48 +0200
      Re: Reading the dimensions of a sprite or JPEG on disk Gerald Holdsworth <nospam@hollypops.co.uk> - 2022-05-28 14:26 +0100
        Re: Reading the dimensions of a sprite or JPEG on disk Paul Sprangers <Paul@sprie.nl> - 2022-05-30 13:58 +0200
          Re: Reading the dimensions of a sprite or JPEG on disk Gerald Holdsworth <nospam@hollypops.co.uk> - 2022-05-30 15:16 +0100
            Re: Reading the dimensions of a sprite or JPEG on disk Paul Sprangers <Paul@sprie.nl> - 2022-05-30 16:51 +0200
              Re: Reading the dimensions of a sprite or JPEG on disk Gerald Holdsworth <nospam@hollypops.co.uk> - 2022-05-30 18:07 +0100
                Re: Reading the dimensions of a sprite or JPEG on disk Paul Sprangers <Paul@sprie.nl> - 2022-05-31 09:27 +0200
                Re: Reading the dimensions of a sprite or JPEG on disk Gerald Holdsworth <nospam@hollypops.co.uk> - 2022-05-31 12:12 +0100
                Re: Reading the dimensions of a sprite or JPEG on disk Paul Sprangers <Paul@sprie.nl> - 2022-05-31 15:30 +0200
                Re: Reading the dimensions of a sprite or JPEG on disk Gerald Holdsworth <nospam@hollypops.co.uk> - 2022-05-31 21:51 +0100
                Re: Reading the dimensions of a sprite or JPEG on disk Steve Fryatt <news@stevefryatt.org.uk> - 2022-05-31 23:29 +0100
                Re: Reading the dimensions of a sprite or JPEG on disk Martin Wuerthner <spamtrap@mw-software.com> - 2022-06-07 16:33 +0200
                Re: Reading the dimensions of a sprite or JPEG on disk Paul Sprangers <Paul@sprie.nl> - 2022-06-11 08:56 +0200
                Re: Reading the dimensions of a sprite or JPEG on disk Sprow <news@sprow.co.uk> - 2022-06-12 08:15 -0700
                Re: Reading the dimensions of a sprite or JPEG on disk Martin <News03@avisoft.f9.co.uk> - 2022-05-31 13:10 +0100
                Re: Reading the dimensions of a sprite or JPEG on disk Paul Sprangers <Paul@sprie.nl> - 2022-05-31 15:59 +0200
                Re: Reading the dimensions of a sprite or JPEG on disk News <chrisjohnson@spamcop.net> - 2022-05-31 16:28 +0100
                Re: Reading the dimensions of a sprite or JPEG on disk News <chrisjohnson@spamcop.net> - 2022-05-31 16:51 +0100
                Re: Reading the dimensions of a sprite or JPEG on disk Paul Sprangers <Paul@sprie.nl> - 2022-05-31 18:33 +0200

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