"Rouben Rostamian" <rostamian_at_umbc.edu> writes:
> Dan Espen <dane_at_mk.telcordia.com> wrote:
> > "Rouben Rostamian" <rostamian_at_umbc.edu> writes:
> > > --- xli (or its alias xsetbg) -------
> > >
> > > Advantages:
> > >
> > > o very fast
> > > o handles transparency
> > > o smooth background image transition without screen blanking
> > >
> > > Disadvantages:
> > >
> > > o does not recognize pgm, xpm, xbm, ...
> > > o too fussy; does not recognize certain types of jpg images
> >
> > I'm guessing you have progressive jpgs. I think you will be able
> > to find a patch to fix that.
>
> I don't know what a progressive jpeg is. I will have to look it up.
> But here is an example of what I get:
>
> % file ciscosplace.jpg
> ciscosplace.jpg: JPEG image data, JFIF standard 1.01, resolution (DPI), 96 x
> 96
>
> % xli ciscosplace.jpg
> jpegLoad: ciscosplace.jpg - Unsupported SOF marker type 0xc2
> ciscosplace.jpg: unknown or unsupported image type
>
> Other viewers have no difficulty in displaying the image.
>
> I have several other jpeg files with the same problem.
Yep. Thats what I got until I applied the progressive jpg patch.
See if you can find it with Google. The one I have is too old
to share. (Nov 2001).
> > > o poor quality smoothing
> >
> > I find -sm works pretty well.
>
> The -smooth option merely blurs the image. Applying -smooth multiple
> times, as the man page suggests, makes it even worse. A side-by-side
> comparison with what xv does with scaled images can be quite striking.
OK.
> > > o buggy: "xsetbg -fillscreen file.jpg" doesn't fill screen for some ima
> ges
> >
> > Depends on the image size, some need -fill, others need -full.
>
> You are right. But it is not clear which images need which option.
> I experimented with images of varying aspect ratios, but gave up at
> the end.
You might be able to figure it out programmatically,
by using convert to get the width/height but
I actually keep a file of commands, each image is displayed
with a hand tuned command.
> My apologies for this off-topic discussion.
Background image techniques are discussed every so often on this
list. I think it fits in.
--
Dan Espen E-mail: dane_at_mk.telcordia.com
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Received on Tue Jun 17 2003 - 22:49:33 BST