Relationship Between Output Image And Destination Frame - evertz 7710ARC Series Manual

7700 MultiFrame Manual
7710ARC Series - SD Aspect Ratio Converter
Figure 6-12: Large to small aspect ratio fill – Letterboxed image
If the input image aspect ratio is smaller than the output image aspect ratio, the height of the input image
completely fills the height of the destination frame and the input image width is scaled by the same
amount. The portion of the width of the destination frame not filled by the input image is filled with a
background image referred to as a vertical bar or side bar (sometimes incorrectly referred to as a
pillarbar). This destination frame configuration is referred to as a "pillarboxed" image.

6.2.3. Relationship Between Output Image and Destination Frame

After the output image is created using the input image aspect ratio and conversion type settings, it is
placed on the destination frame. If the destination frame aspect ratio and output image aspect ratio are the
same then the output image will fill the entire destination frame. If the aspect ratios are different, the
output image will be placed inside the destination frame so that it fills the entire height or width of the
destination frame. Unused portions of the destination frame will be filled with bars.
Since the Source frame or Output image may already contain bars (see section 6.2.2), incorrect aspect
ratio conversion may produce a destination frame containing bars on all four sides resulting in a "postage
stamp" image. In the example below, the output image aspect ratio is smaller than the destination frame
aspect ratio.
Dashed Line shows
extent of the original
4:3 Input Image.
Solid grey line shows
the extent of the 16:9
output image
Figure 6-13: Postage Stamp Image from Incorrect Aspect Ratio conversion
7710ARC-16
Output Image - Fill
4:3 Destination Frame
4:3 Input Image
inside 16:9 image
16:9
Output Image
Revision 1.1
Dashed Line shows
edge of Destination
Frame which is the
production aperture of
the output video.
Light grey bars are the
result of creating the
output image using
"Fill" conversion
Dark grey bars are the
result of placing the
16:9 output image in
4:3 destination frame