Rockwell Automation FactoryTalk View Machine Edition Users Guide - Manual (Page 328)

F ACTORY T ALK V IEW M ACHINE E DITION U SER ’ S G UIDE
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The more colors you use, the more memory is consumed, and the longer the image takes
to load and show.
For example, a 24-bit bitmap image that measures 800x600 pixels consumes 1440 KB of
memory. If the bitmap color depth is decreased to 256 colors, the image might have minor
color loss, but the new image uses only 480 KB of memory.
Use images with a similar pixel size to the size of the FactoryTalk View object on which
the image will be placed. FactoryTalk View resizes the image to fit the object, but if you
use an image that is much larger than the object, the display will be slow to open at run
time, due to the time required to resize the image.
Use local messages
Use local messages to give the operator ongoing information about the status of devices
and processes. For example, you might use local messages to describe the status of a
device whose condition cannot be shown graphically with complete accuracy.
The messages you create in the Local Messages editor are shown in local message display
objects in graphic displays. You can use multiple local message display objects in your
application, and link each object to a different file of messages. Or, you can use the same
file of messages for multiple local message display objects.
Local messages versus information messages
Use local messages to give the operator information in a specific graphic display while the
display is open. To give the operator information no matter which display is open, use
information messages.
For details about information messages, see Chapter 27.
This bitmap type Consumes this many bits per pixel
Monochrome 1
16 color 4
256 color 8 (1 byte)
64 K color 16 (2 bytes)
16 million color 24 (3 bytes)