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| Home › Support › Breeze Help > "Video panel" options dialog box
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This dialog allows you to set image drawing parameters of video panels.
The following options are available in this dialog:
"Automatically activate a fast stretch drawing during playback of any video
('Play' mode)" check box
If this check box is checked then system automatically switches to the fast
stretch image drawing every time when it plays a video ("Play" mode),
independently on the value set by the slider box "'Play" mode". Setting of that
slider box is ignored.
If this check box is unchecked then system switches to the stretch image
drawing mode defined by the slider box "'Play' mode" when it plays a video
("Play" mode).
"2D Graphics: Stretch drawing" group box
In this group box you may specify parameters of a stretch image drawing for
viewing a graphics and playing a video.
You may select a faster but lower quality, or higher quality but slower stretch
drawing mode.
"'View' mode" slider box
Using this slider box you may set stretch drawing parameters for viewing a
graphics ("View" mode of a browser window).
"'Play' mode" slider box
Using this slider box you may set stretch drawing parameters for playing a
video ("Play" mode of a browser window).
Remarks
Usually drawing of image without any stretching (zooming) is noticeably simpler
and faster than drawing of images stretched in or out relative its original
100% size. Depending on hardware resources and software algorithm used for
stretching an image, drawing with stretching may from 2 to 100 times be slower
than drawing of not stretched image.
If size of images is small, video equipment is fast and there is no need to
draw many image frames per second then more complex and slower stretch drawing
algorithms are the favorite choice because they usually provide a noticeably
better quality final stretched image.
Problems appear when size of images becomes big, video equipment is not fast
enough and many image frames have to be drawn every second, as it is required
for playing a video. In that case it is quite possible that more complex
drawing algorithms may be so slow that system can not provide a required frame
rate of drawing.
The only solution which may provide a required frame rate in that sort
situations, is to use simpler and faster drawing algorithms, even if they
provide lower quality stretched images.
It is important to remember that there is a apparent difference between viewing
a static individual image and watching a video sequence consisting of many
image frame displayed every second.
When we view a static individual image for at least several seconds, we are
able to distinguish fine details of image, particularly we may notice, even
unconsciousnessly, defects of image stretching. That is why high quality
stretch drawing algorithms are important for viewing an individual image
(graphics).
When we are watching many image frames per second, our vision is not able to
distinguish fine details of individual images in such a degree as we are able
to do that when we are viewing just one static image. Some details and defects
become almost undistinguishable.
As a result our vision is more tolerant to the defects of image stretching when
are watching a video, and it is more sensitive to the defects when we are
viewing a static image.
In practical terms it means that often (not always) simpler and faster stretch
drawing algorithms may be used for watching a video. They usually provide a
good quality (good psychological perception) of a video.
There are two groups of controls in "Video panel" dialog, upper group and lower
group. Upper group is associated with the primary video panel, and lower group
is associated with the assistant video panel.
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