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List:       kde-core-devel
Subject:    Re: My Todo List ;-) (long)
From:       m_elter () t-online ! de (Matthias Elter)
Date:       1999-12-30 13:35:41
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Mosfet wrote:
> 
(...)
> ImageMagick and Image Viewing
> 
> As some of you may recall a long time ago I wanted to use ImageMagick as
> a base KDE library. This got stalled because it's really hard to do
> efficently. We have QImage->XImage->Image Magick Images that all need to
> be converted. Not what I was looking for. We can skip some of the
> overhead by using just QPixmap and XImage, but it would still be
> inefficent when used in things like KImageShop's canvas. Even with
> XImage you still need to convert back and forth to ImageMagick's
> internal format.
> 
> The approach I am taking to this is I also want to do a new image
> viewer, so I will implement it with that first and if it works well it
> can also be integrated with KImageShop. I want a new image viewer
> anyways because nothing so far for either DE matches the power of xv. I
> can hear you all now - "xv???". Yep, nothing so far compares to xv for
> speed, basic color editing, and other cool features. Note that I am
> referring to image viewing, not manipulation. Kview is supposed to be
> lightweight and for things like viewing images in Konq so I figured I
> would do a new one and we would have two: a lightweight and efficent
> viewer (kview), and a heavyweight viewer with a lot of features. It
> would have a algorithms menu like xv, and we can use that to test
> ImageMagick stuff. This would be a new project so if your interested in
> co-authoring it please feel free to email me.
(...)

I had some time to study the ImageMagick code some time ago and I see
_no_ efficient way to use it directly...neither to manipulate QImages or
KisImages. The algorithms work on scanlines and it should be pretty
simple to rewrite them to work on QImages. Simple but lots of work :).
The approach I'd suggest is to write a new image manipulation lib based
on the IM algorithms that works directly on QImages and which can be
used as a base for apps like your advanced image viewer. For KImageShop
we will have to implement the algorithms again to work directly on
KisImages. Converting QImages<->KisImages is not efficient enough.

Greetings, Matthias

-- 
Matthias Elter
elter@kde.org / m_elter@t-online.de
KDE - http://www.kde.org

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