2018.x

Using Avid Pan & Zoom
237
Adjusting for Source Image Pixel Aspect Ratio and Color Levels in an
Avid Pan & Zoom Effect
The Advanced parameter category provides controls to compensate for differences in pixel aspect
ratio and in color levels between the source image and the video output.
Digital cameras and scanners, common sources for the Avid Pan & Zoom effect, use square pixels.
Computer monitors and HD video formats also use square pixels. SD video formats, however, use
non-square pixels.
Most images you use with the Avid Pan & Zoom effect use RGB color levels that range from 0 to
255. In rare cases, you might use images from a video source with 601 color levels.
To compensate for pixel aspect ratio differences:
t Click the Source Has Square Pixels button in the Advanced parameter category.
When Source Has Square Pixels is on, the Avid Pan & Zoom effect makes the calculations
necessary to produce results compatible with rectangular pixels. This is the default setting.
When Source Has Square Pixels is off, the Avid Pan & Zoom effect does not change the pixel
shape but does apply the aspect ratio in effect for the project. This might be a good setting if your
source image does not have square pixels, for example, if it comes from an SD video source.
To adjust for source image color levels:
t Click the Level Fast Menu button, and select an option from the Fast menu.
Managing Memory with the Avid Pan & Zoom Effect
The images you work with in Avid Pan & Zoom are often extremely large. The amount of memory
used to store a large image can impact the performance of your Avid editing application. The Cache
parameter gives you control over the amount of memory used to store your images for playback. A
full resolution image is always used for rendering.
To control the amount of memory used to store images:
t Click the Cache Fast Menu button, and select an option from the Fast menu.
Option Description
Source has RGB Level For images with a black level of 0 and a white level of 255. The
effect maps colors to video black and white levels, which are 16
and 235 respectively. This is the default setting.
Source has 601 Levels Refers to the ITU-R-601 standard for video black and white levels.
Select 601 if you use images from an SD video source. When you
select 601 for the Level setting, the effect makes no adjustment to
color levels.
Option Description
Video Resolution The effect stores a source image at a reduced pixel resolution that
uses about 1 MB per image. Use Video Resolution if you have
many images in your sequence and you need to limit how much
memory they occupy.