[Kde-imaging] [Bug 140982] Kipi slideshow is blurry/pixelated if opengl transitions are enabled

[Brad Templeton]

https://bugs.kde.org/show_bug.cgi?id=140982





--- Comment #8 from Brad Templeton <kdebug mail 4brad com>  2009-11-29 22:06:40 ---
Tried the new option, and it works on small images, however, it still fails on
large panoramic images, which are one of my primary goals.  (Because large
panoramic images tend to have very large aspect ratios like 6 to 1 or even 20
to 1, they can't fit on any monitor.  As such, displaying them and having it
slowly pan through the image turns out to be a desirable goal.)

When displaying large panoramics, the images seem to be seriously down-rezzed,
to the point of seeing individual pixels on many of them.   Shorter panoramics
display OK.

In addition -- perhaps this should be another bug -- really large panoramics,
such as ones that are 50,000 pixels wide and 4,000 high, do not display
properly at all.   You get something which looks like a stretch of a single
column or so of the image -- a series of coloured horizontal lines.  Though it
does seem to pan over them (not that you can easily tell) in ken burns mode.

I realize such images are large, though my 1gb GT220 graphics card should be
able to hold them in memory.  However, it should not have to.   With the screen
being 1600 high, the approach that would make sense would be to scale the image
down to 1600 high (or slightly taller if you plan some ken burns vertical pan,
though I don't really want vertical pan on such images) so that it is 20,000 by
1,600, which would be 128 megabytes at 32 bits/pixel.

Note that this is not even the biggest I have, I have built panoramas over
100,000 pixels wide.   (And I am not even the biggest, see gigapan.org where
people have thousands and thousands of images like this.)

People seek a way to display these.

I will also note that when doing a ken burns on these, such that the panning is
fairly quick, there is jerkiness to the pan, and also some tearing.  Is the
card failing here or the code?

To add to the list of panorama feature requests (again possibly I should open
another ticket) would be a suggestion that when doing panoramas, the time per
slide be variable and the pan rate be fixed.  Ie. if you see an image with an
aspect ratio of say, more than 3 to 1, modify the display time based on the
aspect ratio.

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